4:13 p.m.
This is the multifd save prototype in semi-functional state,
with both save and restore minimally functional.
There are still quite a few rough edges.
KNOWN ISSUES:
1) this applies only to virsh save and virsh restore for now
(no managed save etc).
2) the .pl scripts to generate the headers for the new APIs
do not reliably work for me, for the Restore case. I get:
src/remote/remote_daemon_dispatch_stubs.h:10080:9:
error: too few arguments to function ‘virDomainRestoreParametersFlags’
if (virDomainRestoreParametersFlags(params, nparams, args->flags) < 0)
To work around this I had to fixup the header manually to add the
conn parameter like this:
...(conn, params, nparams, args->flags) < 0)
3) error handling is not good yet, especially during resume,
errors may leave behind a qemu process and such.
May need some help find all of these cases...
...
changes from v3:
* reordered series to have all helper-related change at the start
* solved all reported issues from ninja test, including documentation
* fixed most broken migration capabilities code (still imperfect likely)
* added G_GNUC_UNUSED as needed
* after multifd restore, added what I think were the missing operations:
qemuProcessRefreshState(),
qemuProcessStartCPUs() - most importantly,
virDomainObjSave()
The domain now starts running after restore without further encouragement
* removed the sleep(10) from the multifd-helper
changes from v2:
* added ability to restore the VM from disk using multifd
* fixed the multifd-helper to work in both directions,
assuming the need to listen for save, and connect for restore.
* fixed a large number of bugs, and probably introduced some :-)
Thanks for your thoughts,
Claudio
*** BLURB HERE ***
Claudio Fontana (20):
iohelper: introduce new struct to carry copy operation parameters
iohelper: refactor copy operation as a separate function
iohelper: move runIO function to a separate module
runio: add arguments to extend use beyond just stdin and stdout
multifd-helper: new helper for parallel save/restore
libvirt: introduce virDomainSaveParametersFlags public API
libvirt: introduce virDomainRestoreParametersFlags public API
remote: Add RPC support for the virDomainSaveParametersFlags API
remote: Add RPC support for the virDomainRestoreParametersFlags API
qemu: add a stub for virDomainSaveParametersFlags API
qemu: add a stub for virDomainRestoreParametersFlags API
qemu: saveimage: introduce virQEMUSaveFd
qemu: wire up saveimage code with the multifd helper
qemu: capabilities: add multifd to the probed migration capabilities
qemu: implement qemuMigrationSrcToFilesMultiFd
qemu: add parameter to qemuMigrationDstRun to skip waiting
qemu: implement qemuSaveImageLoadMultiFd
tools: add parallel parameter to virsh save command
tools: add parallel parameter to virsh restore command
qemu: add migration parameter multifd-compression
docs/manpages/virsh.rst | 34 +-
include/libvirt/libvirt-domain.h | 49 ++
po/POTFILES.in | 2 +
src/driver-hypervisor.h | 14 +
src/libvirt-domain.c | 99 ++++
src/libvirt_private.syms | 1 +
src/libvirt_public.syms | 6 +
src/qemu/qemu_capabilities.c | 6 +
src/qemu/qemu_capabilities.h | 4 +
src/qemu/qemu_driver.c | 239 +++++++--
src/qemu/qemu_migration.c | 155 ++++--
src/qemu/qemu_migration.h | 16 +-
src/qemu/qemu_migration_params.c | 71 ++-
src/qemu/qemu_migration_params.h | 15 +
src/qemu/qemu_process.c | 3 +-
src/qemu/qemu_process.h | 5 +-
src/qemu/qemu_saveimage.c | 496 ++++++++++++++----
src/qemu/qemu_saveimage.h | 49 +-
src/qemu/qemu_snapshot.c | 6 +-
src/remote/remote_driver.c | 2 +
src/remote/remote_protocol.x | 29 +-
src/remote_protocol-structs | 17 +
src/util/iohelper.c | 150 +-----
src/util/meson.build | 15 +
src/util/multifd-helper.c | 250 +++++++++
src/util/runio.c | 214 ++++++++
src/util/runio.h | 38 ++
src/util/virthread.c | 5 +
src/util/virthread.h | 1 +
.../caps_4.0.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_4.0.0.ppc64.xml | 1 +
.../caps_4.0.0.riscv32.xml | 1 +
.../caps_4.0.0.riscv64.xml | 1 +
.../qemucapabilitiesdata/caps_4.0.0.s390x.xml | 1 +
.../caps_4.0.0.x86_64.xml | 1 +
.../caps_4.1.0.x86_64.xml | 1 +
.../caps_4.2.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_4.2.0.ppc64.xml | 1 +
.../qemucapabilitiesdata/caps_4.2.0.s390x.xml | 1 +
.../caps_4.2.0.x86_64.xml | 1 +
.../caps_5.0.0.aarch64.xml | 2 +
.../qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 2 +
.../caps_5.0.0.riscv64.xml | 2 +
.../caps_5.0.0.x86_64.xml | 2 +
.../qemucapabilitiesdata/caps_5.1.0.sparc.xml | 2 +
.../caps_5.1.0.x86_64.xml | 2 +
.../caps_5.2.0.aarch64.xml | 2 +
.../qemucapabilitiesdata/caps_5.2.0.ppc64.xml | 2 +
.../caps_5.2.0.riscv64.xml | 2 +
.../qemucapabilitiesdata/caps_5.2.0.s390x.xml | 2 +
.../caps_5.2.0.x86_64.xml | 2 +
.../caps_6.0.0.aarch64.xml | 2 +
.../qemucapabilitiesdata/caps_6.0.0.s390x.xml | 2 +
.../caps_6.0.0.x86_64.xml | 2 +
.../caps_6.1.0.x86_64.xml | 2 +
.../caps_6.2.0.aarch64.xml | 2 +
.../qemucapabilitiesdata/caps_6.2.0.ppc64.xml | 2 +
.../caps_6.2.0.x86_64.xml | 2 +
.../caps_7.0.0.aarch64.xml | 2 +
.../qemucapabilitiesdata/caps_7.0.0.ppc64.xml | 2 +
.../caps_7.0.0.x86_64.xml | 2 +
tools/virsh-domain.c | 96 +++-
62 files changed, 1713 insertions(+), 427 deletions(-)
create mode 100644 src/util/multifd-helper.c
create mode 100644 src/util/runio.c
create mode 100644 src/util/runio.h
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 01/20] iohelper: introduce new struct to carry copy operation parameters
this is in preparation for a minor refactoring of the copy
function itself out of runIO().
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/util/iohelper.c | 95 +++++++++++++++++++++++++--------------------
1 file changed, 53 insertions(+), 42 deletions(-)
diff --git a/src/util/iohelper.c b/src/util/iohelper.c
index 2c91bf4f93..c13746a547 100644
--- a/src/util/iohelper.c
+++ b/src/util/iohelper.c
@@ -45,6 +45,16 @@
# define O_DIRECT 0
#endif
+struct runIOParams {
+ bool isBlockDev;
+ bool isDirect;
+ bool isWrite;
+ int fdin;
+ const char *fdinname;
+ int fdout;
+ const char *fdoutname;
+};
+
static int
runIO(const char *path, int fd, int oflags)
{
@@ -53,13 +63,9 @@ runIO(const char *path, int fd, int oflags)
size_t buflen = 1024*1024;
intptr_t alignMask = 64*1024 - 1;
int ret = -1;
- int fdin, fdout;
- const char *fdinname, *fdoutname;
- unsigned long long total = 0;
- bool direct = O_DIRECT && ((oflags & O_DIRECT) != 0);
- off_t end = 0;
+ off_t total = 0;
struct stat sb;
- bool isBlockDev = false;
+ struct runIOParams p;
#if WITH_POSIX_MEMALIGN
if (posix_memalign(&base, alignMask + 1, buflen))
@@ -77,34 +83,23 @@ runIO(const char *path, int fd, int oflags)
fd, path);
goto cleanup;
}
- isBlockDev = S_ISBLK(sb.st_mode);
+ p.isBlockDev = S_ISBLK(sb.st_mode);
+ p.isDirect = O_DIRECT && (oflags & O_DIRECT);
switch (oflags & O_ACCMODE) {
case O_RDONLY:
- fdin = fd;
- fdinname = path;
- fdout = STDOUT_FILENO;
- fdoutname = "stdout";
- /* To make the implementation simpler, we give up on any
- * attempt to use O_DIRECT in a non-trivial manner. */
- if (!isBlockDev && direct && ((end = lseek(fd, 0, SEEK_CUR)) !=
0)) {
- virReportSystemError(end < 0 ? errno : EINVAL, "%s",
- _("O_DIRECT read needs entire seekable
file"));
- goto cleanup;
- }
+ p.isWrite = false;
+ p.fdin = fd;
+ p.fdinname = path;
+ p.fdout = STDOUT_FILENO;
+ p.fdoutname = "stdout";
break;
case O_WRONLY:
- fdin = STDIN_FILENO;
- fdinname = "stdin";
- fdout = fd;
- fdoutname = path;
- /* To make the implementation simpler, we give up on any
- * attempt to use O_DIRECT in a non-trivial manner. */
- if (!isBlockDev && direct && (end = lseek(fd, 0, SEEK_END)) != 0)
{
- virReportSystemError(end < 0 ? errno : EINVAL, "%s",
- _("O_DIRECT write needs empty seekable
file"));
- goto cleanup;
- }
+ p.isWrite = true;
+ p.fdin = STDIN_FILENO;
+ p.fdinname = "stdin";
+ p.fdout = fd;
+ p.fdoutname = path;
break;
case O_RDWR:
@@ -114,6 +109,22 @@ runIO(const char *path, int fd, int oflags)
(oflags & O_ACCMODE));
goto cleanup;
}
+ /* To make the implementation simpler, we give up on any
+ * attempt to use O_DIRECT in a non-trivial manner. */
+ if (!p.isBlockDev && p.isDirect) {
+ off_t off;
+ if (p.isWrite) {
+ if ((off = lseek(fd, 0, SEEK_END)) != 0) {
+ virReportSystemError(off < 0 ? errno : EINVAL, "%s",
+ _("O_DIRECT write needs empty seekable
file"));
+ goto cleanup;
+ }
+ } else if ((off = lseek(fd, 0, SEEK_CUR)) != 0) {
+ virReportSystemError(off < 0 ? errno : EINVAL, "%s",
+ _("O_DIRECT read needs entire seekable
file"));
+ goto cleanup;
+ }
+ }
while (1) {
ssize_t got;
@@ -124,16 +135,16 @@ runIO(const char *path, int fd, int oflags)
* writes will be aligned.
* In other cases using saferead reduces number of syscalls.
*/
- if (fdin == fd && direct) {
- if ((got = read(fdin, buf, buflen)) < 0 &&
+ if (!p.isWrite && p.isDirect) {
+ if ((got = read(p.fdin, buf, buflen)) < 0 &&
errno == EINTR)
continue;
} else {
- got = saferead(fdin, buf, buflen);
+ got = saferead(p.fdin, buf, buflen);
}
if (got < 0) {
- virReportSystemError(errno, _("Unable to read %s"), fdinname);
+ virReportSystemError(errno, _("Unable to read %s"), p.fdinname);
goto cleanup;
}
if (got == 0)
@@ -142,35 +153,35 @@ runIO(const char *path, int fd, int oflags)
total += got;
/* handle last write size align in direct case */
- if (got < buflen && direct && fdout == fd) {
+ if (got < buflen && p.isDirect && p.isWrite) {
ssize_t aligned_got = (got + alignMask) & ~alignMask;
memset(buf + got, 0, aligned_got - got);
- if (safewrite(fdout, buf, aligned_got) < 0) {
- virReportSystemError(errno, _("Unable to write %s"),
fdoutname);
+ if (safewrite(p.fdout, buf, aligned_got) < 0) {
+ virReportSystemError(errno, _("Unable to write %s"),
p.fdoutname);
goto cleanup;
}
- if (!isBlockDev && ftruncate(fd, total) < 0) {
- virReportSystemError(errno, _("Unable to truncate %s"),
fdoutname);
+ if (!p.isBlockDev && ftruncate(p.fdout, total) < 0) {
+ virReportSystemError(errno, _("Unable to truncate %s"),
p.fdoutname);
goto cleanup;
}
break;
}
- if (safewrite(fdout, buf, got) < 0) {
- virReportSystemError(errno, _("Unable to write %s"), fdoutname);
+ if (safewrite(p.fdout, buf, got) < 0) {
+ virReportSystemError(errno, _("Unable to write %s"), p.fdoutname);
goto cleanup;
}
}
/* Ensure all data is written */
- if (virFileDataSync(fdout) < 0) {
+ if (virFileDataSync(p.fdout) < 0) {
if (errno != EINVAL && errno != EROFS) {
/* fdatasync() may fail on some special FDs, e.g. pipes */
- virReportSystemError(errno, _("unable to fsync %s"), fdoutname);
+ virReportSystemError(errno, _("unable to fsync %s"), p.fdoutname);
goto cleanup;
}
}
--
2.34.1
4:17 a.m.
New subject: [libvirt RFCv4 01/20] iohelper: introduce new struct to carry copy operation parameters
On Wed, Apr 27, 2022 at 11:13:20PM +0200, Claudio Fontana wrote:
this is in preparation for a minor refactoring of the copy
function itself out of runIO().
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/util/iohelper.c | 95 +++++++++++++++++++++++++--------------------
1 file changed, 53 insertions(+), 42 deletions(-)
Reviewed-by: Daniel P. Berrangé <berrange(a)redhat.com>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
8:01 a.m.
New subject: [libvirt RFCv4 01/20] iohelper: introduce new struct to carry copy operation parameters
On Wed, Apr 27, 2022 at 11:13:20PM +0200, Claudio Fontana wrote:
this is in preparation for a minor refactoring of the copy
function itself out of runIO().
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/util/iohelper.c | 95 +++++++++++++++++++++++++--------------------
1 file changed, 53 insertions(+), 42 deletions(-)
diff --git a/src/util/iohelper.c b/src/util/iohelper.c
index 2c91bf4f93..c13746a547 100644
--- a/src/util/iohelper.c
+++ b/src/util/iohelper.c
@@ -45,6 +45,16 @@
# define O_DIRECT 0
#endif
+struct runIOParams {
+ bool isBlockDev;
+ bool isDirect;
+ bool isWrite;
+ int fdin;
+ const char *fdinname;
+ int fdout;
+ const char *fdoutname;
+};
+
static int
runIO(const char *path, int fd, int oflags)
{
@@ -53,13 +63,9 @@ runIO(const char *path, int fd, int oflags)
size_t buflen = 1024*1024;
intptr_t alignMask = 64*1024 - 1;
int ret = -1;
- int fdin, fdout;
- const char *fdinname, *fdoutname;
- unsigned long long total = 0;
- bool direct = O_DIRECT && ((oflags & O_DIRECT) != 0);
- off_t end = 0;
+ off_t total = 0;
struct stat sb;
- bool isBlockDev = false;
+ struct runIOParams p;
#if WITH_POSIX_MEMALIGN
if (posix_memalign(&base, alignMask + 1, buflen))
@@ -77,34 +83,23 @@ runIO(const char *path, int fd, int oflags)
fd, path);
goto cleanup;
}
- isBlockDev = S_ISBLK(sb.st_mode);
+ p.isBlockDev = S_ISBLK(sb.st_mode);
+ p.isDirect = O_DIRECT && (oflags & O_DIRECT);
switch (oflags & O_ACCMODE) {
case O_RDONLY:
- fdin = fd;
- fdinname = path;
- fdout = STDOUT_FILENO;
- fdoutname = "stdout";
- /* To make the implementation simpler, we give up on any
- * attempt to use O_DIRECT in a non-trivial manner. */
- if (!isBlockDev && direct && ((end = lseek(fd, 0, SEEK_CUR)) !=
0)) {
- virReportSystemError(end < 0 ? errno : EINVAL, "%s",
- _("O_DIRECT read needs entire seekable
file"));
- goto cleanup;
- }
+ p.isWrite = false;
+ p.fdin = fd;
+ p.fdinname = path;
+ p.fdout = STDOUT_FILENO;
+ p.fdoutname = "stdout";
break;
case O_WRONLY:
- fdin = STDIN_FILENO;
- fdinname = "stdin";
- fdout = fd;
- fdoutname = path;
- /* To make the implementation simpler, we give up on any
- * attempt to use O_DIRECT in a non-trivial manner. */
- if (!isBlockDev && direct && (end = lseek(fd, 0, SEEK_END)) !=
0) {
- virReportSystemError(end < 0 ? errno : EINVAL, "%s",
- _("O_DIRECT write needs empty seekable
file"));
- goto cleanup;
- }
+ p.isWrite = true;
+ p.fdin = STDIN_FILENO;
+ p.fdinname = "stdin";
+ p.fdout = fd;
+ p.fdoutname = path;
break;
case O_RDWR:
@@ -114,6 +109,22 @@ runIO(const char *path, int fd, int oflags)
(oflags & O_ACCMODE));
goto cleanup;
}
+ /* To make the implementation simpler, we give up on any
+ * attempt to use O_DIRECT in a non-trivial manner. */
+ if (!p.isBlockDev && p.isDirect) {
+ off_t off;
+ if (p.isWrite) {
+ if ((off = lseek(fd, 0, SEEK_END)) != 0) {
+ virReportSystemError(off < 0 ? errno : EINVAL, "%s",
+ _("O_DIRECT write needs empty seekable
file"));
+ goto cleanup;
+ }
+ } else if ((off = lseek(fd, 0, SEEK_CUR)) != 0) {
+ virReportSystemError(off < 0 ? errno : EINVAL, "%s",
+ _("O_DIRECT read needs entire seekable
file"));
+ goto cleanup;
+ }
I'm puzzelled about the current code doing SEEK_END in one case
and SEEK_CUR in the other case. I think this method should simply
use SEEK_CUR only as a sanity check for being ablt to use O_DIRECT.
If we actually need to position the file offset, then the caller
should do a SEEK_END itself.
+ }
while (1) {
ssize_t got;
@@ -124,16 +135,16 @@ runIO(const char *path, int fd, int oflags)
* writes will be aligned.
* In other cases using saferead reduces number of syscalls.
*/
- if (fdin == fd && direct) {
- if ((got = read(fdin, buf, buflen)) < 0 &&
+ if (!p.isWrite && p.isDirect) {
+ if ((got = read(p.fdin, buf, buflen)) < 0 &&
errno == EINTR)
continue;
} else {
- got = saferead(fdin, buf, buflen);
+ got = saferead(p.fdin, buf, buflen);
}
The distinction for read vs saferead is for correctness with O_DIRECT.
We only want to use read on the plain file / blockdev, and saferead
on the socket/pipe.
We already call fstat to let us figure out the fd type, so can use
that decide whether to use read vs saferead.
This ties into my comment on the later patch about simplifying the
parameters passed in, to remove the distinction of read vs write.
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
4:24 a.m.
New subject: [libvirt RFCv4 01/20] iohelper: introduce new struct to carry copy operation parameters
On 4/28/22 3:01 PM, Daniel P. Berrangé wrote:
On Wed, Apr 27, 2022 at 11:13:20PM +0200, Claudio Fontana wrote:
> this is in preparation for a minor refactoring of the copy
> function itself out of runIO().
>
> Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
> ---
> src/util/iohelper.c | 95 +++++++++++++++++++++++++--------------------
> 1 file changed, 53 insertions(+), 42 deletions(-)
>
> diff --git a/src/util/iohelper.c b/src/util/iohelper.c
> index 2c91bf4f93..c13746a547 100644
> --- a/src/util/iohelper.c
> +++ b/src/util/iohelper.c
> @@ -45,6 +45,16 @@
> # define O_DIRECT 0
> #endif
>
> +struct runIOParams {
> + bool isBlockDev;
> + bool isDirect;
> + bool isWrite;
> + int fdin;
> + const char *fdinname;
> + int fdout;
> + const char *fdoutname;
> +};
> +
> static int
> runIO(const char *path, int fd, int oflags)
> {
> @@ -53,13 +63,9 @@ runIO(const char *path, int fd, int oflags)
> size_t buflen = 1024*1024;
> intptr_t alignMask = 64*1024 - 1;
> int ret = -1;
> - int fdin, fdout;
> - const char *fdinname, *fdoutname;
> - unsigned long long total = 0;
> - bool direct = O_DIRECT && ((oflags & O_DIRECT) != 0);
> - off_t end = 0;
> + off_t total = 0;
> struct stat sb;
> - bool isBlockDev = false;
> + struct runIOParams p;
>
> #if WITH_POSIX_MEMALIGN
> if (posix_memalign(&base, alignMask + 1, buflen))
> @@ -77,34 +83,23 @@ runIO(const char *path, int fd, int oflags)
> fd, path);
> goto cleanup;
> }
> - isBlockDev = S_ISBLK(sb.st_mode);
> + p.isBlockDev = S_ISBLK(sb.st_mode);
> + p.isDirect = O_DIRECT && (oflags & O_DIRECT);
>
> switch (oflags & O_ACCMODE) {
> case O_RDONLY:
> - fdin = fd;
> - fdinname = path;
> - fdout = STDOUT_FILENO;
> - fdoutname = "stdout";
> - /* To make the implementation simpler, we give up on any
> - * attempt to use O_DIRECT in a non-trivial manner. */
> - if (!isBlockDev && direct && ((end = lseek(fd, 0, SEEK_CUR))
!= 0)) {
> - virReportSystemError(end < 0 ? errno : EINVAL, "%s",
> - _("O_DIRECT read needs entire seekable
file"));
> - goto cleanup;
> - }
> + p.isWrite = false;
> + p.fdin = fd;
> + p.fdinname = path;
> + p.fdout = STDOUT_FILENO;
> + p.fdoutname = "stdout";
> break;
> case O_WRONLY:
> - fdin = STDIN_FILENO;
> - fdinname = "stdin";
> - fdout = fd;
> - fdoutname = path;
> - /* To make the implementation simpler, we give up on any
> - * attempt to use O_DIRECT in a non-trivial manner. */
> - if (!isBlockDev && direct && (end = lseek(fd, 0, SEEK_END))
!= 0) {
> - virReportSystemError(end < 0 ? errno : EINVAL, "%s",
> - _("O_DIRECT write needs empty seekable
file"));
> - goto cleanup;
> - }
> + p.isWrite = true;
> + p.fdin = STDIN_FILENO;
> + p.fdinname = "stdin";
> + p.fdout = fd;
> + p.fdoutname = path;
> break;
>
> case O_RDWR:
> @@ -114,6 +109,22 @@ runIO(const char *path, int fd, int oflags)
> (oflags & O_ACCMODE));
> goto cleanup;
> }
> + /* To make the implementation simpler, we give up on any
> + * attempt to use O_DIRECT in a non-trivial manner. */
> + if (!p.isBlockDev && p.isDirect) {
> + off_t off;
> + if (p.isWrite) {
> + if ((off = lseek(fd, 0, SEEK_END)) != 0) {
> + virReportSystemError(off < 0 ? errno : EINVAL, "%s",
> + _("O_DIRECT write needs empty seekable
file"));
> + goto cleanup;
> + }
> + } else if ((off = lseek(fd, 0, SEEK_CUR)) != 0) {
> + virReportSystemError(off < 0 ? errno : EINVAL, "%s",
> + _("O_DIRECT read needs entire seekable
file"));
> + goto cleanup;
> + }
I'm puzzelled about the current code doing SEEK_END in one case
and SEEK_CUR in the other case. I think this method should simply
use SEEK_CUR only as a sanity check for being ablt to use O_DIRECT.
I think the answer is in the original commit:
commit 12291656b135ed788e41dadbd2d15e613ddea9b5
Author: Eric Blake <eblake(a)redhat.com>
Date: Tue Jul 12 08:35:05 2011 -0600
save: let iohelper work on O_DIRECT fds
Required for a coming patch where iohelper will operate on O_DIRECT
fds. There, the user-space memory must be aligned to file system
boundaries (at least 512, but using page-aligned works better, and
some file systems prefer 64k). Made tougher by the fact that
VIR_ALLOC won't work on void *, but posix_memalign won't work on
char * and isn't available everywhere.
This patch makes some simplifying assumptions - namely, output
to an O_DIRECT fd will only be attempted on an empty seekable
file (hence, no need to worry about preserving existing data
on a partial block, and ftruncate will work to undo the effects
of having to round up the size of the last block written), and
input from an O_DIRECT fd will only be attempted on a complete
seekable file with the only possible short read at EOF.
----
Here the relevant part being "empty seekable file".
The check not only ensures the file is seekable, but also double checks that it is empty.
I can add a comment to make it explicit.
If we actually need to position the file offset, then the caller
should do a SEEK_END itself.
> + }
>
> while (1) {
> ssize_t got;
> @@ -124,16 +135,16 @@ runIO(const char *path, int fd, int oflags)
> * writes will be aligned.
> * In other cases using saferead reduces number of syscalls.
> */
> - if (fdin == fd && direct) {
> - if ((got = read(fdin, buf, buflen)) < 0 &&
> + if (!p.isWrite && p.isDirect) {
> + if ((got = read(p.fdin, buf, buflen)) < 0 &&
> errno == EINTR)
> continue;
> } else {
> - got = saferead(fdin, buf, buflen);
> + got = saferead(p.fdin, buf, buflen);
> }
The distinction for read vs saferead is for correctness with O_DIRECT.
We only want to use read on the plain file / blockdev, and saferead
on the socket/pipe.
Yes that's clear.
We already call fstat to let us figure out the fd type, so can use
that decide whether to use read vs saferead.
This ties into my comment on the later patch about simplifying the
parameters passed in, to remove the distinction of read vs write.
As mentioned elsewhere I don't think it can be simplified quite that way,
but I think there is an alternative that could work, will propose in the next spin.
Thanks
Claudio
4:13 p.m.
New subject: [libvirt RFCv4 02/20] iohelper: refactor copy operation as a separate function
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/util/iohelper.c | 131 +++++++++++++++++++++++++-------------------
1 file changed, 75 insertions(+), 56 deletions(-)
diff --git a/src/util/iohelper.c b/src/util/iohelper.c
index c13746a547..1584321839 100644
--- a/src/util/iohelper.c
+++ b/src/util/iohelper.c
@@ -55,17 +55,23 @@ struct runIOParams {
const char *fdoutname;
};
-static int
-runIO(const char *path, int fd, int oflags)
+/**
+ * runIOCopy: execute the IO copy based on the passed parameters
+ * @p: the IO parameters
+ *
+ * Execute the copy based on the passed parameters.
+ *
+ * Returns: size transfered, or < 0 on error.
+ */
+
+static off_t
+runIOCopy(const struct runIOParams p)
{
g_autofree void *base = NULL; /* Location to be freed */
char *buf = NULL; /* Aligned location within base */
size_t buflen = 1024*1024;
intptr_t alignMask = 64*1024 - 1;
- int ret = -1;
off_t total = 0;
- struct stat sb;
- struct runIOParams p;
#if WITH_POSIX_MEMALIGN
if (posix_memalign(&base, alignMask + 1, buflen))
@@ -77,6 +83,67 @@ runIO(const char *path, int fd, int oflags)
buf = (char *) (((intptr_t) base + alignMask) & ~alignMask);
#endif
+ while (1) {
+ ssize_t got;
+
+ /* If we read with O_DIRECT from file we can't use saferead as
+ * it can lead to unaligned read after reading last bytes.
+ * If we write with O_DIRECT use should use saferead so that
+ * writes will be aligned.
+ * In other cases using saferead reduces number of syscalls.
+ */
+ if (!p.isWrite && p.isDirect) {
+ if ((got = read(p.fdin, buf, buflen)) < 0 &&
+ errno == EINTR)
+ continue;
+ } else {
+ got = saferead(p.fdin, buf, buflen);
+ }
+
+ if (got < 0) {
+ virReportSystemError(errno, _("Unable to read %s"), p.fdinname);
+ return -2;
+ }
+ if (got == 0)
+ break;
+
+ total += got;
+
+ /* handle last write size align in direct case */
+ if (got < buflen && p.isDirect && p.isWrite) {
+ ssize_t aligned_got = (got + alignMask) & ~alignMask;
+
+ memset(buf + got, 0, aligned_got - got);
+
+ if (safewrite(p.fdout, buf, aligned_got) < 0) {
+ virReportSystemError(errno, _("Unable to write %s"),
p.fdoutname);
+ return -3;
+ }
+
+ if (!p.isBlockDev && ftruncate(p.fdout, total) < 0) {
+ virReportSystemError(errno, _("Unable to truncate %s"),
p.fdoutname);
+ return -4;
+ }
+
+ break;
+ }
+
+ if (safewrite(p.fdout, buf, got) < 0) {
+ virReportSystemError(errno, _("Unable to write %s"), p.fdoutname);
+ return -3;
+ }
+ }
+ return total;
+}
+
+static int
+runIO(const char *path, int fd, int oflags)
+{
+ int ret = -1;
+ off_t total = 0;
+ struct stat sb;
+ struct runIOParams p;
+
if (fstat(fd, &sb) < 0) {
virReportSystemError(errno,
_("Unable to access file descriptor %d path %s"),
@@ -125,57 +192,9 @@ runIO(const char *path, int fd, int oflags)
goto cleanup;
}
}
-
- while (1) {
- ssize_t got;
-
- /* If we read with O_DIRECT from file we can't use saferead as
- * it can lead to unaligned read after reading last bytes.
- * If we write with O_DIRECT use should use saferead so that
- * writes will be aligned.
- * In other cases using saferead reduces number of syscalls.
- */
- if (!p.isWrite && p.isDirect) {
- if ((got = read(p.fdin, buf, buflen)) < 0 &&
- errno == EINTR)
- continue;
- } else {
- got = saferead(p.fdin, buf, buflen);
- }
-
- if (got < 0) {
- virReportSystemError(errno, _("Unable to read %s"), p.fdinname);
- goto cleanup;
- }
- if (got == 0)
- break;
-
- total += got;
-
- /* handle last write size align in direct case */
- if (got < buflen && p.isDirect && p.isWrite) {
- ssize_t aligned_got = (got + alignMask) & ~alignMask;
-
- memset(buf + got, 0, aligned_got - got);
-
- if (safewrite(p.fdout, buf, aligned_got) < 0) {
- virReportSystemError(errno, _("Unable to write %s"),
p.fdoutname);
- goto cleanup;
- }
-
- if (!p.isBlockDev && ftruncate(p.fdout, total) < 0) {
- virReportSystemError(errno, _("Unable to truncate %s"),
p.fdoutname);
- goto cleanup;
- }
-
- break;
- }
-
- if (safewrite(p.fdout, buf, got) < 0) {
- virReportSystemError(errno, _("Unable to write %s"), p.fdoutname);
- goto cleanup;
- }
- }
+ total = runIOCopy(p);
+ if (total < 0)
+ goto cleanup;
/* Ensure all data is written */
if (virFileDataSync(p.fdout) < 0) {
--
2.34.1
7:47 a.m.
New subject: [libvirt RFCv4 02/20] iohelper: refactor copy operation as a separate function
On Wed, Apr 27, 2022 at 11:13:21PM +0200, Claudio Fontana wrote:
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/util/iohelper.c | 131 +++++++++++++++++++++++++-------------------
1 file changed, 75 insertions(+), 56 deletions(-)
Reviewed-by: Daniel P. Berrangé <berrange(a)redhat.com>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
4:13 p.m.
New subject: [libvirt RFCv4 03/20] iohelper: move runIO function to a separate module
where it can be reused by other helpers.
No changes other than the move.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
po/POTFILES.in | 1 +
src/util/iohelper.c | 178 +----------------------------------
src/util/meson.build | 2 +
src/util/runio.c | 214 +++++++++++++++++++++++++++++++++++++++++++
src/util/runio.h | 23 +++++
5 files changed, 241 insertions(+), 177 deletions(-)
create mode 100644 src/util/runio.c
create mode 100644 src/util/runio.h
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 0d9adb0758..5b4c00d7ac 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -241,6 +241,7 @@
@SRCDIR(a)src/storage_file/storage_source_backingstore.c
@SRCDIR(a)src/test/test_driver.c
@SRCDIR(a)src/util/iohelper.c
+@SRCDIR(a)src/util/runio.c
@SRCDIR(a)src/util/viralloc.c
@SRCDIR(a)src/util/virarptable.c
@SRCDIR(a)src/util/viraudit.c
diff --git a/src/util/iohelper.c b/src/util/iohelper.c
index 1584321839..5a0098542e 100644
--- a/src/util/iohelper.c
+++ b/src/util/iohelper.c
@@ -38,183 +38,7 @@
#include "virrandom.h"
#include "virstring.h"
#include "virgettext.h"
-
-#define VIR_FROM_THIS VIR_FROM_STORAGE
-
-#ifndef O_DIRECT
-# define O_DIRECT 0
-#endif
-
-struct runIOParams {
- bool isBlockDev;
- bool isDirect;
- bool isWrite;
- int fdin;
- const char *fdinname;
- int fdout;
- const char *fdoutname;
-};
-
-/**
- * runIOCopy: execute the IO copy based on the passed parameters
- * @p: the IO parameters
- *
- * Execute the copy based on the passed parameters.
- *
- * Returns: size transfered, or < 0 on error.
- */
-
-static off_t
-runIOCopy(const struct runIOParams p)
-{
- g_autofree void *base = NULL; /* Location to be freed */
- char *buf = NULL; /* Aligned location within base */
- size_t buflen = 1024*1024;
- intptr_t alignMask = 64*1024 - 1;
- off_t total = 0;
-
-#if WITH_POSIX_MEMALIGN
- if (posix_memalign(&base, alignMask + 1, buflen))
- abort();
- buf = base;
-#else
- buf = g_new0(char, buflen + alignMask);
- base = buf;
- buf = (char *) (((intptr_t) base + alignMask) & ~alignMask);
-#endif
-
- while (1) {
- ssize_t got;
-
- /* If we read with O_DIRECT from file we can't use saferead as
- * it can lead to unaligned read after reading last bytes.
- * If we write with O_DIRECT use should use saferead so that
- * writes will be aligned.
- * In other cases using saferead reduces number of syscalls.
- */
- if (!p.isWrite && p.isDirect) {
- if ((got = read(p.fdin, buf, buflen)) < 0 &&
- errno == EINTR)
- continue;
- } else {
- got = saferead(p.fdin, buf, buflen);
- }
-
- if (got < 0) {
- virReportSystemError(errno, _("Unable to read %s"), p.fdinname);
- return -2;
- }
- if (got == 0)
- break;
-
- total += got;
-
- /* handle last write size align in direct case */
- if (got < buflen && p.isDirect && p.isWrite) {
- ssize_t aligned_got = (got + alignMask) & ~alignMask;
-
- memset(buf + got, 0, aligned_got - got);
-
- if (safewrite(p.fdout, buf, aligned_got) < 0) {
- virReportSystemError(errno, _("Unable to write %s"),
p.fdoutname);
- return -3;
- }
-
- if (!p.isBlockDev && ftruncate(p.fdout, total) < 0) {
- virReportSystemError(errno, _("Unable to truncate %s"),
p.fdoutname);
- return -4;
- }
-
- break;
- }
-
- if (safewrite(p.fdout, buf, got) < 0) {
- virReportSystemError(errno, _("Unable to write %s"), p.fdoutname);
- return -3;
- }
- }
- return total;
-}
-
-static int
-runIO(const char *path, int fd, int oflags)
-{
- int ret = -1;
- off_t total = 0;
- struct stat sb;
- struct runIOParams p;
-
- if (fstat(fd, &sb) < 0) {
- virReportSystemError(errno,
- _("Unable to access file descriptor %d path %s"),
- fd, path);
- goto cleanup;
- }
- p.isBlockDev = S_ISBLK(sb.st_mode);
- p.isDirect = O_DIRECT && (oflags & O_DIRECT);
-
- switch (oflags & O_ACCMODE) {
- case O_RDONLY:
- p.isWrite = false;
- p.fdin = fd;
- p.fdinname = path;
- p.fdout = STDOUT_FILENO;
- p.fdoutname = "stdout";
- break;
- case O_WRONLY:
- p.isWrite = true;
- p.fdin = STDIN_FILENO;
- p.fdinname = "stdin";
- p.fdout = fd;
- p.fdoutname = path;
- break;
-
- case O_RDWR:
- default:
- virReportSystemError(EINVAL,
- _("Unable to process file with flags %d"),
- (oflags & O_ACCMODE));
- goto cleanup;
- }
- /* To make the implementation simpler, we give up on any
- * attempt to use O_DIRECT in a non-trivial manner. */
- if (!p.isBlockDev && p.isDirect) {
- off_t off;
- if (p.isWrite) {
- if ((off = lseek(fd, 0, SEEK_END)) != 0) {
- virReportSystemError(off < 0 ? errno : EINVAL, "%s",
- _("O_DIRECT write needs empty seekable
file"));
- goto cleanup;
- }
- } else if ((off = lseek(fd, 0, SEEK_CUR)) != 0) {
- virReportSystemError(off < 0 ? errno : EINVAL, "%s",
- _("O_DIRECT read needs entire seekable
file"));
- goto cleanup;
- }
- }
- total = runIOCopy(p);
- if (total < 0)
- goto cleanup;
-
- /* Ensure all data is written */
- if (virFileDataSync(p.fdout) < 0) {
- if (errno != EINVAL && errno != EROFS) {
- /* fdatasync() may fail on some special FDs, e.g. pipes */
- virReportSystemError(errno, _("unable to fsync %s"), p.fdoutname);
- goto cleanup;
- }
- }
-
- ret = 0;
-
- cleanup:
- if (VIR_CLOSE(fd) < 0 &&
- ret == 0) {
- virReportSystemError(errno, _("Unable to close %s"), path);
- ret = -1;
- }
- return ret;
-}
+#include "runio.h"
static const char *program_name;
diff --git a/src/util/meson.build b/src/util/meson.build
index 24350a3e67..58001a1699 100644
--- a/src/util/meson.build
+++ b/src/util/meson.build
@@ -175,6 +175,8 @@ keycode_dep = declare_dependency(
io_helper_sources = [
'iohelper.c',
+ 'runio.c',
+ 'runio.h',
]
virt_util_lib = static_library(
diff --git a/src/util/runio.c b/src/util/runio.c
new file mode 100644
index 0000000000..a7b902af7e
--- /dev/null
+++ b/src/util/runio.c
@@ -0,0 +1,214 @@
+/*
+ * runio.c: I/O copy function
+ *
+ * Copyright (C) 2011-2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>;.
+ */
+
+#include <config.h>
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include "virthread.h"
+#include "virfile.h"
+#include "viralloc.h"
+#include "virerror.h"
+#include "virrandom.h"
+#include "virstring.h"
+#include "virgettext.h"
+#include "runio.h"
+
+#define VIR_FROM_THIS VIR_FROM_STORAGE
+
+#ifndef O_DIRECT
+# define O_DIRECT 0
+#endif
+
+struct runIOParams {
+ bool isBlockDev;
+ bool isDirect;
+ bool isWrite;
+ int fdin;
+ const char *fdinname;
+ int fdout;
+ const char *fdoutname;
+};
+
+/**
+ * runIOCopy: execute the IO copy based on the passed parameters
+ * @p: the IO parameters
+ *
+ * Execute the copy based on the passed parameters.
+ *
+ * Returns: size transfered, or < 0 on error.
+ */
+
+static off_t
+runIOCopy(const struct runIOParams p)
+{
+ g_autofree void *base = NULL; /* Location to be freed */
+ char *buf = NULL; /* Aligned location within base */
+ size_t buflen = 1024*1024;
+ intptr_t alignMask = 64*1024 - 1;
+ off_t total = 0;
+
+#if WITH_POSIX_MEMALIGN
+ if (posix_memalign(&base, alignMask + 1, buflen))
+ abort();
+ buf = base;
+#else
+ buf = g_new0(char, buflen + alignMask);
+ base = buf;
+ buf = (char *) (((intptr_t) base + alignMask) & ~alignMask);
+#endif
+
+ while (1) {
+ ssize_t got;
+
+ /* If we read with O_DIRECT from file we can't use saferead as
+ * it can lead to unaligned read after reading last bytes.
+ * If we write with O_DIRECT use should use saferead so that
+ * writes will be aligned.
+ * In other cases using saferead reduces number of syscalls.
+ */
+ if (!p.isWrite && p.isDirect) {
+ if ((got = read(p.fdin, buf, buflen)) < 0 &&
+ errno == EINTR)
+ continue;
+ } else {
+ got = saferead(p.fdin, buf, buflen);
+ }
+
+ if (got < 0) {
+ virReportSystemError(errno, _("Unable to read %s"), p.fdinname);
+ return -2;
+ }
+ if (got == 0)
+ break;
+
+ total += got;
+
+ /* handle last write size align in direct case */
+ if (got < buflen && p.isDirect && p.isWrite) {
+ ssize_t aligned_got = (got + alignMask) & ~alignMask;
+
+ memset(buf + got, 0, aligned_got - got);
+
+ if (safewrite(p.fdout, buf, aligned_got) < 0) {
+ virReportSystemError(errno, _("Unable to write %s"),
p.fdoutname);
+ return -3;
+ }
+
+ if (!p.isBlockDev && ftruncate(p.fdout, total) < 0) {
+ virReportSystemError(errno, _("Unable to truncate %s"),
p.fdoutname);
+ return -4;
+ }
+
+ break;
+ }
+
+ if (safewrite(p.fdout, buf, got) < 0) {
+ virReportSystemError(errno, _("Unable to write %s"), p.fdoutname);
+ return -3;
+ }
+ }
+ return total;
+}
+
+
+off_t
+runIO(const char *path, int fd, int oflags)
+{
+ int ret = -1;
+ off_t total = 0;
+ struct stat sb;
+ struct runIOParams p;
+
+ if (fstat(fd, &sb) < 0) {
+ virReportSystemError(errno,
+ _("Unable to access file descriptor %d path %s"),
+ fd, path);
+ goto cleanup;
+ }
+ p.isBlockDev = S_ISBLK(sb.st_mode);
+ p.isDirect = O_DIRECT && (oflags & O_DIRECT);
+
+ switch (oflags & O_ACCMODE) {
+ case O_RDONLY:
+ p.isWrite = false;
+ p.fdin = fd;
+ p.fdinname = path;
+ p.fdout = STDOUT_FILENO;
+ p.fdoutname = "stdout";
+ break;
+ case O_WRONLY:
+ p.isWrite = true;
+ p.fdin = STDIN_FILENO;
+ p.fdinname = "stdin";
+ p.fdout = fd;
+ p.fdoutname = path;
+ break;
+
+ case O_RDWR:
+ default:
+ virReportSystemError(EINVAL,
+ _("Unable to process file with flags %d"),
+ (oflags & O_ACCMODE));
+ goto cleanup;
+ }
+ /* To make the implementation simpler, we give up on any
+ * attempt to use O_DIRECT in a non-trivial manner. */
+ if (!p.isBlockDev && p.isDirect) {
+ off_t off;
+ if (p.isWrite) {
+ if ((off = lseek(fd, 0, SEEK_END)) != 0) {
+ virReportSystemError(off < 0 ? errno : EINVAL, "%s",
+ _("O_DIRECT write needs empty seekable
file"));
+ goto cleanup;
+ }
+ } else if ((off = lseek(fd, 0, SEEK_CUR)) != 0) {
+ virReportSystemError(off < 0 ? errno : EINVAL, "%s",
+ _("O_DIRECT read needs entire seekable
file"));
+ goto cleanup;
+ }
+ }
+ total = runIOCopy(p);
+ if (total < 0)
+ goto cleanup;
+
+ /* Ensure all data is written */
+ if (virFileDataSync(p.fdout) < 0) {
+ if (errno != EINVAL && errno != EROFS) {
+ /* fdatasync() may fail on some special FDs, e.g. pipes */
+ virReportSystemError(errno, _("unable to fsync %s"), p.fdoutname);
+ goto cleanup;
+ }
+ }
+
+ ret = 0;
+
+ cleanup:
+ if (VIR_CLOSE(fd) < 0 &&
+ ret == 0) {
+ virReportSystemError(errno, _("Unable to close %s"), path);
+ ret = -1;
+ }
+ return ret;
+}
diff --git a/src/util/runio.h b/src/util/runio.h
new file mode 100644
index 0000000000..beb58606c9
--- /dev/null
+++ b/src/util/runio.h
@@ -0,0 +1,23 @@
+/*
+ * runio.h: I/O copy function
+ *
+ * Copyright (C) 2011-2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>;.
+ */
+
+#pragma once
+
+off_t runIO(const char *path, int fd, int oflags);
--
2.34.1
7:55 a.m.
New subject: [libvirt RFCv4 03/20] iohelper: move runIO function to a separate module
On Wed, Apr 27, 2022 at 11:13:22PM +0200, Claudio Fontana wrote:
where it can be reused by other helpers.
No changes other than the move.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
po/POTFILES.in | 1 +
src/util/iohelper.c | 178 +----------------------------------
src/util/meson.build | 2 +
src/util/runio.c | 214 +++++++++++++++++++++++++++++++++++++++++++
src/util/runio.h | 23 +++++
5 files changed, 241 insertions(+), 177 deletions(-)
create mode 100644 src/util/runio.c
create mode 100644 src/util/runio.h
+off_t runIO(const char *path, int fd, int oflags);
I think we could just put it in virfile.{ch} and call it
virFileCopyData
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
5:08 a.m.
New subject: [libvirt RFCv4 03/20] iohelper: move runIO function to a separate module
On 4/28/22 2:55 PM, Daniel P. Berrangé wrote:
On Wed, Apr 27, 2022 at 11:13:22PM +0200, Claudio Fontana wrote:
> where it can be reused by other helpers.
> No changes other than the move.
>
> Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
> ---
> po/POTFILES.in | 1 +
> src/util/iohelper.c | 178 +----------------------------------
> src/util/meson.build | 2 +
> src/util/runio.c | 214 +++++++++++++++++++++++++++++++++++++++++++
> src/util/runio.h | 23 +++++
> 5 files changed, 241 insertions(+), 177 deletions(-)
> create mode 100644 src/util/runio.c
> create mode 100644 src/util/runio.h
> +off_t runIO(const char *path, int fd, int oflags);
I think we could just put it in virfile.{ch} and call it
virFileCopyData
hmmm... it is not quite as generic as the name would imply though.
The API centers around a transfer between a disk (the focus of the API), and something
else (pipe, socket).
What about VirFileDiskCopy?
5:13 a.m.
New subject: [libvirt RFCv4 03/20] iohelper: move runIO function to a separate module
On 4/29/22 12:08 PM, Claudio Fontana wrote:
On 4/28/22 2:55 PM, Daniel P. Berrangé wrote:
> On Wed, Apr 27, 2022 at 11:13:22PM +0200, Claudio Fontana wrote:
>> where it can be reused by other helpers.
>> No changes other than the move.
>>
>> Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
>> ---
>> po/POTFILES.in | 1 +
>> src/util/iohelper.c | 178 +----------------------------------
>> src/util/meson.build | 2 +
>> src/util/runio.c | 214 +++++++++++++++++++++++++++++++++++++++++++
>> src/util/runio.h | 23 +++++
>> 5 files changed, 241 insertions(+), 177 deletions(-)
>> create mode 100644 src/util/runio.c
>> create mode 100644 src/util/runio.h
>
>
>
>> +off_t runIO(const char *path, int fd, int oflags);
>
> I think we could just put it in virfile.{ch} and call it
> virFileCopyData
hmmm... it is not quite as generic as the name would imply though.
The API centers around a transfer between a disk (the focus of the API), and something
else (pipe, socket).
What about VirFileDiskCopy?
Btw what about
#define VIR_FROM_THIS ?
In virtfile.c it is
#define VIR_FROM_THIS VIR_FROM_NONE
while in iohelper it is
#define VIR_FROM_THIS VIR_FROM_STORAGE
I guess this is error-reporting related,
should we lose the #define VIR_FROM_THIS VIR_FROM_STORAGE with the move to virfile.c ?
Thanks,
Claudio
4:13 p.m.
New subject: [libvirt RFCv4 04/20] runio: add arguments to extend use beyond just stdin and stdout
add arguments to runio to allow read/write from/to arbitrary
file descriptors, as opposed to just stdin and stdout.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/util/iohelper.c | 2 +-
src/util/runio.c | 10 +++++-----
src/util/runio.h | 17 ++++++++++++++++-
3 files changed, 22 insertions(+), 7 deletions(-)
diff --git a/src/util/iohelper.c b/src/util/iohelper.c
index 5a0098542e..93674c1e2f 100644
--- a/src/util/iohelper.c
+++ b/src/util/iohelper.c
@@ -96,7 +96,7 @@ main(int argc, char **argv)
usage(EXIT_FAILURE);
}
- if (fd < 0 || runIO(path, fd, oflags) < 0)
+ if (fd < 0 || runIO(path, fd, oflags, STDIN_FILENO, STDOUT_FILENO) < 0)
goto error;
return 0;
diff --git a/src/util/runio.c b/src/util/runio.c
index a7b902af7e..f42acddae9 100644
--- a/src/util/runio.c
+++ b/src/util/runio.c
@@ -134,7 +134,7 @@ runIOCopy(const struct runIOParams p)
off_t
-runIO(const char *path, int fd, int oflags)
+runIO(const char *path, int fd, int oflags, int in_fd, int out_fd)
{
int ret = -1;
off_t total = 0;
@@ -155,13 +155,13 @@ runIO(const char *path, int fd, int oflags)
p.isWrite = false;
p.fdin = fd;
p.fdinname = path;
- p.fdout = STDOUT_FILENO;
- p.fdoutname = "stdout";
+ p.fdout = out_fd;
+ p.fdoutname = "output";
break;
case O_WRONLY:
p.isWrite = true;
- p.fdin = STDIN_FILENO;
- p.fdinname = "stdin";
+ p.fdin = in_fd;
+ p.fdinname = "input";
p.fdout = fd;
p.fdoutname = path;
break;
diff --git a/src/util/runio.h b/src/util/runio.h
index beb58606c9..66df588881 100644
--- a/src/util/runio.h
+++ b/src/util/runio.h
@@ -20,4 +20,19 @@
#pragma once
-off_t runIO(const char *path, int fd, int oflags);
+/*
+ * runIO: copy unidirectionally all data to/from a file descriptor.
+ *
+ * @path: the pathname corresponding to FD.
+ * @fd: the file descriptor to read from or write to.
+ * @oflags: the file status flags of FD.
+ *
+ * If the oflags indicate O_RDONLY, then the direction will be from FD,
+ * and @out_fd indicates the file to write to.
+ *
+ * If the oflags indicate O_WRONLY, then the direction will be to FD,
+ * and @in_fd indicates the file to read from.
+ *
+ * Returns the number of bytes transferred, or < 0 on error.
+ */
+off_t runIO(const char *path, int fd, int oflags, int in_fd, int out_fd);
--
2.34.1
7:54 a.m.
New subject: [libvirt RFCv4 04/20] runio: add arguments to extend use beyond just stdin and stdout
On Wed, Apr 27, 2022 at 11:13:23PM +0200, Claudio Fontana wrote:
add arguments to runio to allow read/write from/to arbitrary
file descriptors, as opposed to just stdin and stdout.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/util/iohelper.c | 2 +-
src/util/runio.c | 10 +++++-----
src/util/runio.h | 17 ++++++++++++++++-
3 files changed, 22 insertions(+), 7 deletions(-)
diff --git a/src/util/iohelper.c b/src/util/iohelper.c
index 5a0098542e..93674c1e2f 100644
--- a/src/util/iohelper.c
+++ b/src/util/iohelper.c
@@ -96,7 +96,7 @@ main(int argc, char **argv)
usage(EXIT_FAILURE);
}
- if (fd < 0 || runIO(path, fd, oflags) < 0)
+ if (fd < 0 || runIO(path, fd, oflags, STDIN_FILENO, STDOUT_FILENO) < 0)
goto error;
return 0;
diff --git a/src/util/runio.c b/src/util/runio.c
index a7b902af7e..f42acddae9 100644
--- a/src/util/runio.c
+++ b/src/util/runio.c
@@ -134,7 +134,7 @@ runIOCopy(const struct runIOParams p)
off_t
-runIO(const char *path, int fd, int oflags)
+runIO(const char *path, int fd, int oflags, int in_fd, int out_fd)
This is getting rather wierd as a signature.
If O_RDONLY, then in_fd is ignored, 'fd' is input.
If O_WRONLY, then out_fd is ignored, 'fd' is output
What about instead simply :
runIO(const char *srcpath, int srcfd,
const char *dstpath, int dstfd)
so there's no read vs write distinction at all.
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
8:02 a.m.
New subject: [libvirt RFCv4 04/20] runio: add arguments to extend use beyond just stdin and stdout
On Thu, Apr 28, 2022 at 01:54:28PM +0100, Daniel P. Berrangé wrote:
On Wed, Apr 27, 2022 at 11:13:23PM +0200, Claudio Fontana wrote:
> add arguments to runio to allow read/write from/to arbitrary
> file descriptors, as opposed to just stdin and stdout.
>
> Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
> ---
> src/util/iohelper.c | 2 +-
> src/util/runio.c | 10 +++++-----
> src/util/runio.h | 17 ++++++++++++++++-
> 3 files changed, 22 insertions(+), 7 deletions(-)
>
> diff --git a/src/util/iohelper.c b/src/util/iohelper.c
> index 5a0098542e..93674c1e2f 100644
> --- a/src/util/iohelper.c
> +++ b/src/util/iohelper.c
> @@ -96,7 +96,7 @@ main(int argc, char **argv)
> usage(EXIT_FAILURE);
> }
>
> - if (fd < 0 || runIO(path, fd, oflags) < 0)
> + if (fd < 0 || runIO(path, fd, oflags, STDIN_FILENO, STDOUT_FILENO) < 0)
> goto error;
>
> return 0;
> diff --git a/src/util/runio.c b/src/util/runio.c
> index a7b902af7e..f42acddae9 100644
> --- a/src/util/runio.c
> +++ b/src/util/runio.c
> @@ -134,7 +134,7 @@ runIOCopy(const struct runIOParams p)
>
>
> off_t
> -runIO(const char *path, int fd, int oflags)
> +runIO(const char *path, int fd, int oflags, int in_fd, int out_fd)
This is getting rather wierd as a signature.
If O_RDONLY, then in_fd is ignored, 'fd' is input.
If O_WRONLY, then out_fd is ignored, 'fd' is output
What about instead simply :
runIO(const char *srcpath, int srcfd,
const char *dstpath, int dstfd)
so there's no read vs write distinction at all.
I guess we need 'int srcflags and 'int dstflags' too, unless we just
call fcntl() to query them instead.
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
11:24 a.m.
New subject: [libvirt RFCv4 04/20] runio: add arguments to extend use beyond just stdin and stdout
On 4/28/22 2:54 PM, Daniel P. Berrangé wrote:
On Wed, Apr 27, 2022 at 11:13:23PM +0200, Claudio Fontana wrote:
> add arguments to runio to allow read/write from/to arbitrary
> file descriptors, as opposed to just stdin and stdout.
>
> Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
> ---
> src/util/iohelper.c | 2 +-
> src/util/runio.c | 10 +++++-----
> src/util/runio.h | 17 ++++++++++++++++-
> 3 files changed, 22 insertions(+), 7 deletions(-)
>
> diff --git a/src/util/iohelper.c b/src/util/iohelper.c
> index 5a0098542e..93674c1e2f 100644
> --- a/src/util/iohelper.c
> +++ b/src/util/iohelper.c
> @@ -96,7 +96,7 @@ main(int argc, char **argv)
> usage(EXIT_FAILURE);
> }
>
> - if (fd < 0 || runIO(path, fd, oflags) < 0)
> + if (fd < 0 || runIO(path, fd, oflags, STDIN_FILENO, STDOUT_FILENO) < 0)
> goto error;
>
> return 0;
> diff --git a/src/util/runio.c b/src/util/runio.c
> index a7b902af7e..f42acddae9 100644
> --- a/src/util/runio.c
> +++ b/src/util/runio.c
> @@ -134,7 +134,7 @@ runIOCopy(const struct runIOParams p)
>
>
> off_t
> -runIO(const char *path, int fd, int oflags)
> +runIO(const char *path, int fd, int oflags, int in_fd, int out_fd)
This is getting rather wierd as a signature.
If O_RDONLY, then in_fd is ignored, 'fd' is input.
If O_WRONLY, then out_fd is ignored, 'fd' is output
What about instead simply :
runIO(const char *srcpath, int srcfd,
const char *dstpath, int dstfd)
so there's no read vs write distinction at all.
maybe I am a bit confused/tired, but I don't see how this would work,
which side one of those is the disk, where we want to check for S_ISBLK and O_DIRECT, and
buffer accordingly?
...
Alternative:
off_t runIO(int disk_fd, const char *disk_path, int remote_fd, char *remote_path) ?
And we could check oflags of disk_fd inside runIO instead of having it as an argument, to
remove some clutter.
Downside is for stdin and stdout we need then something special. For example:
runIO(fd, path, -1, "stdio");
where "stdio" alerts runIO that it needs to use STDIN_FILENO if we are writing
to the disk, or STDOUT_FILENO if we are reading from the disk.
Wdyt?
Thanks,
Claudio
11:26 a.m.
New subject: [libvirt RFCv4 04/20] runio: add arguments to extend use beyond just stdin and stdout
On Thu, Apr 28, 2022 at 06:24:11PM +0200, Claudio Fontana wrote:
On 4/28/22 2:54 PM, Daniel P. Berrangé wrote:
> On Wed, Apr 27, 2022 at 11:13:23PM +0200, Claudio Fontana wrote:
>> add arguments to runio to allow read/write from/to arbitrary
>> file descriptors, as opposed to just stdin and stdout.
>>
>> Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
>> ---
>> src/util/iohelper.c | 2 +-
>> src/util/runio.c | 10 +++++-----
>> src/util/runio.h | 17 ++++++++++++++++-
>> 3 files changed, 22 insertions(+), 7 deletions(-)
>>
>> diff --git a/src/util/iohelper.c b/src/util/iohelper.c
>> index 5a0098542e..93674c1e2f 100644
>> --- a/src/util/iohelper.c
>> +++ b/src/util/iohelper.c
>> @@ -96,7 +96,7 @@ main(int argc, char **argv)
>> usage(EXIT_FAILURE);
>> }
>>
>> - if (fd < 0 || runIO(path, fd, oflags) < 0)
>> + if (fd < 0 || runIO(path, fd, oflags, STDIN_FILENO, STDOUT_FILENO) <
0)
>> goto error;
>>
>> return 0;
>> diff --git a/src/util/runio.c b/src/util/runio.c
>> index a7b902af7e..f42acddae9 100644
>> --- a/src/util/runio.c
>> +++ b/src/util/runio.c
>> @@ -134,7 +134,7 @@ runIOCopy(const struct runIOParams p)
>>
>>
>> off_t
>> -runIO(const char *path, int fd, int oflags)
>> +runIO(const char *path, int fd, int oflags, int in_fd, int out_fd)
>
> This is getting rather wierd as a signature.
>
> If O_RDONLY, then in_fd is ignored, 'fd' is input.
>
> If O_WRONLY, then out_fd is ignored, 'fd' is output
>
> What about instead simply :
>
> runIO(const char *srcpath, int srcfd,
> const char *dstpath, int dstfd)
>
> so there's no read vs write distinction at all.
maybe I am a bit confused/tired, but I don't see how this would work,
which side one of those is the disk, where we want to check for S_ISBLK and O_DIRECT, and
buffer accordingly?
We call fstat on the FD, we'll know which FD is a pipe/socket vs
which FD is a file/blockdev. If we call fcntl(GET_FL) we can also
discover if O_DIRECT is turned on or not.
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
11:40 a.m.
New subject: [libvirt RFCv4 04/20] runio: add arguments to extend use beyond just stdin and stdout
On 4/28/22 6:26 PM, Daniel P. Berrangé wrote:
On Thu, Apr 28, 2022 at 06:24:11PM +0200, Claudio Fontana wrote:
> On 4/28/22 2:54 PM, Daniel P. Berrangé wrote:
>> On Wed, Apr 27, 2022 at 11:13:23PM +0200, Claudio Fontana wrote:
>>> add arguments to runio to allow read/write from/to arbitrary
>>> file descriptors, as opposed to just stdin and stdout.
>>>
>>> Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
>>> ---
>>> src/util/iohelper.c | 2 +-
>>> src/util/runio.c | 10 +++++-----
>>> src/util/runio.h | 17 ++++++++++++++++-
>>> 3 files changed, 22 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/src/util/iohelper.c b/src/util/iohelper.c
>>> index 5a0098542e..93674c1e2f 100644
>>> --- a/src/util/iohelper.c
>>> +++ b/src/util/iohelper.c
>>> @@ -96,7 +96,7 @@ main(int argc, char **argv)
>>> usage(EXIT_FAILURE);
>>> }
>>>
>>> - if (fd < 0 || runIO(path, fd, oflags) < 0)
>>> + if (fd < 0 || runIO(path, fd, oflags, STDIN_FILENO, STDOUT_FILENO)
< 0)
>>> goto error;
>>>
>>> return 0;
>>> diff --git a/src/util/runio.c b/src/util/runio.c
>>> index a7b902af7e..f42acddae9 100644
>>> --- a/src/util/runio.c
>>> +++ b/src/util/runio.c
>>> @@ -134,7 +134,7 @@ runIOCopy(const struct runIOParams p)
>>>
>>>
>>> off_t
>>> -runIO(const char *path, int fd, int oflags)
>>> +runIO(const char *path, int fd, int oflags, int in_fd, int out_fd)
>>
>> This is getting rather wierd as a signature.
>>
>> If O_RDONLY, then in_fd is ignored, 'fd' is input.
>>
>> If O_WRONLY, then out_fd is ignored, 'fd' is output
>>
>> What about instead simply :
>>
>> runIO(const char *srcpath, int srcfd,
>> const char *dstpath, int dstfd)
>>
>> so there's no read vs write distinction at all.
>
> maybe I am a bit confused/tired, but I don't see how this would work,
> which side one of those is the disk, where we want to check for S_ISBLK and O_DIRECT,
and buffer accordingly?
We call fstat on the FD, we'll know which FD is a pipe/socket vs
which FD is a file/blockdev. If we call fcntl(GET_FL) we can also
discover if O_DIRECT is turned on or not.
Probably I am indeed tired :-)
I cannot figure out how to call runIO() following your idea in iohelper.c. Can you show
me?
Because we'd need to first use fcntl(fd, F_GETFL) in iohelper to figure out if the
disk is actually being read or written to,
to then then pass the parameters to runIO in the right order in terms of source vs
destination,
and then inside runIO run fcntl(fd, F_GETFL) again to figure out which of the two sides is
actually the disk, to check for S_ISBLK, O_DIRECT.
It seems quite convoluted to me.. but maybe I am not seeing something simple (and in that
case time for me to get some rest indeed).
Ciao,
Claudio
4:13 p.m.
New subject: [libvirt RFCv4 05/20] multifd-helper: new helper for parallel save/restore
For the save direction, this helper listens on a unix socket
which QEMU connects to for multifd migration to files.
For the restore direction, this helper connects to a unix socket
QEMU listens at for multifd migration from files.
The file descriptors are passed as command line parameters.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
po/POTFILES.in | 1 +
src/libvirt_private.syms | 1 +
src/util/meson.build | 13 ++
src/util/multifd-helper.c | 250 ++++++++++++++++++++++++++++++++++++++
src/util/virthread.c | 5 +
src/util/virthread.h | 1 +
6 files changed, 271 insertions(+)
create mode 100644 src/util/multifd-helper.c
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 5b4c00d7ac..493a5c3f80 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -242,6 +242,7 @@
@SRCDIR(a)src/test/test_driver.c
@SRCDIR(a)src/util/iohelper.c
@SRCDIR(a)src/util/runio.c
+@SRCDIR(a)src/util/multifd-helper.c
@SRCDIR(a)src/util/viralloc.c
@SRCDIR(a)src/util/virarptable.c
@SRCDIR(a)src/util/viraudit.c
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 97bfca906b..5f2bee985e 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -3427,6 +3427,7 @@ virThreadCreateFull;
virThreadID;
virThreadIsSelf;
virThreadJoin;
+virThreadJoinRet;
virThreadMaxName;
virThreadSelf;
virThreadSelfID;
diff --git a/src/util/meson.build b/src/util/meson.build
index 58001a1699..8ea74ff9e8 100644
--- a/src/util/meson.build
+++ b/src/util/meson.build
@@ -179,6 +179,12 @@ io_helper_sources = [
'runio.h',
]
+multifd_helper_sources = [
+ 'multifd-helper.c',
+ 'runio.c',
+ 'runio.h',
+]
+
virt_util_lib = static_library(
'virt_util',
[
@@ -216,6 +222,13 @@ if conf.has('WITH_LIBVIRTD')
dtrace_gen_headers,
],
}
+ virt_helpers += {
+ 'name': 'libvirt_multifd_helper',
+ 'sources': [
+ files(multifd_helper_sources),
+ dtrace_gen_headers,
+ ],
+ }
endif
util_inc_dir = include_directories('.')
diff --git a/src/util/multifd-helper.c b/src/util/multifd-helper.c
new file mode 100644
index 0000000000..b74f9a4c16
--- /dev/null
+++ b/src/util/multifd-helper.c
@@ -0,0 +1,250 @@
+/*
+ * multifd-helper.c: listens on Unix socket to perform I/O to multiple files
+ *
+ * Copyright (C) 2022 SUSE LLC
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>;.
+ *
+ * This has been written to support QEMU multifd migration to file,
+ * allowing better use of cpu resources to speed up the save/restore.
+ */
+
+#include <config.h>
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include "virthread.h"
+#include "virfile.h"
+#include "virerror.h"
+#include "virstring.h"
+#include "virgettext.h"
+#include "runio.h"
+
+#define VIR_FROM_THIS VIR_FROM_STORAGE
+
+typedef struct _multiFdConnData multiFdConnData;
+struct _multiFdConnData {
+ int clientfd;
+ int filefd;
+ int oflags;
+ const char *path;
+ virThread tid;
+
+ off_t total;
+};
+
+typedef struct _multiFdThreadArgs multiFdThreadArgs;
+struct _multiFdThreadArgs {
+ int nchannels;
+ multiFdConnData *conn; /* contains main fd + nchannels */
+ const char *sun_path; /* unix socket name to use for the server */
+ struct sockaddr_un serv_addr;
+
+ off_t total;
+};
+
+static void clientThreadFunc(void *a)
+{
+ multiFdConnData *c = a;
+ c->total = runIO(c->path, c->filefd, c->oflags, c->clientfd,
c->clientfd);
+}
+
+static off_t waitClientThreads(multiFdConnData *conn, int n)
+{
+ int idx;
+ off_t total = 0;
+ for (idx = 0; idx < n; idx++) {
+ multiFdConnData *c = &conn[idx];
+ if (virThreadJoinRet(&c->tid) < 0) {
+ total = -1;
+ } else if (total >= 0) {
+ total += c->total;
+ }
+ if (VIR_CLOSE(c->clientfd) < 0) {
+ total = -1;
+ }
+ }
+ return total;
+}
+
+static void loadThreadFunc(void *a)
+{
+ multiFdThreadArgs *args = a;
+ int idx;
+ args->total = -1;
+
+ for (idx = 0; idx < args->nchannels + 1; idx++) {
+ /* Perform outgoing connections */
+ multiFdConnData *c = &args->conn[idx];
+ c->clientfd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (c->clientfd < 0) {
+ virReportSystemError(errno, "%s", _("loadThread: socket()
failed"));
+ goto cleanup;
+ }
+ if (connect(c->clientfd, (const struct sockaddr *)&args->serv_addr,
+ sizeof(struct sockaddr_un)) < 0) {
+ virReportSystemError(errno, "%s", _("loadThread: connect()
failed"));
+ goto cleanup;
+ }
+ if (virThreadCreate(&c->tid, true, &clientThreadFunc, c) < 0) {
+ virReportSystemError(errno, "%s", _("loadThread: client thread
creation failed"));
+ goto cleanup;
+ }
+ }
+ args->total = waitClientThreads(args->conn, args->nchannels + 1);
+
+ cleanup:
+ for (idx = 0; idx < args->nchannels + 1; idx++) {
+ multiFdConnData *c = &args->conn[idx];
+ VIR_FORCE_CLOSE(c->clientfd);
+ }
+}
+
+static void saveThreadFunc(void *a)
+{
+ multiFdThreadArgs *args = a;
+ int idx;
+ const char buf[1] = {'R'};
+ int sockfd;
+
+ if ((sockfd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
+ virReportSystemError(errno, "%s", _("saveThread: socket()
failed"));
+ return;
+ }
+ unlink(args->sun_path);
+ if (bind(sockfd, (struct sockaddr *)&args->serv_addr,
sizeof(args->serv_addr)) < 0) {
+ virReportSystemError(errno, "%s", _("saveThread: bind()
failed"));
+ goto cleanup;
+ }
+ if (listen(sockfd, args->nchannels + 1) < 0) {
+ virReportSystemError(errno, "%s", _("saveThread: listen()
failed"));
+ goto cleanup;
+ }
+
+ /* signal that the server is ready */
+ if (safewrite(STDOUT_FILENO, &buf, 1) != 1) {
+ virReportSystemError(errno, "%s", _("saveThread: safewrite
failed"));
+ goto cleanup;
+ }
+
+ for (idx = 0; idx < args->nchannels + 1; idx++) {
+ /* Wait for incoming connection. */
+ multiFdConnData *c = &args->conn[idx];
+ if ((c->clientfd = accept(sockfd, NULL, NULL)) < 0) {
+ virReportSystemError(errno, "%s", _("saveThread: accept()
failed"));
+ goto cleanup;
+ }
+ if (virThreadCreate(&c->tid, true, &clientThreadFunc, c) < 0) {
+ virReportSystemError(errno, "%s", _("saveThread: client thread
creation failed"));
+ goto cleanup;
+ }
+ }
+
+ args->total = waitClientThreads(args->conn, args->nchannels + 1);
+
+ cleanup:
+ for (idx = 0; idx < args->nchannels + 1; idx++) {
+ multiFdConnData *c = &args->conn[idx];
+ VIR_FORCE_CLOSE(c->clientfd);
+ }
+ if (VIR_CLOSE(sockfd) < 0)
+ args->total = -1;
+}
+
+static const char *program_name;
+
+G_GNUC_NORETURN static void
+usage(int status)
+{
+ if (status) {
+ fprintf(stderr, _("%s: try --help for more details"), program_name);
+ } else {
+ fprintf(stderr, _("Usage: %s UNIX_SOCNAME N MAINFD FD0 FD1 ... FDn"),
program_name);
+ }
+ exit(status);
+}
+
+int
+main(int argc, char **argv)
+{
+ virThread tid;
+ virThreadFunc func = saveThreadFunc;
+ multiFdThreadArgs args = { 0 };
+ int idx;
+
+ /* sleep(10); */
+
+ program_name = argv[0];
+
+ if (virGettextInitialize() < 0 ||
+ virErrorInitialize() < 0) {
+ fprintf(stderr, _("%s: initialization failed"), program_name);
+ exit(EXIT_FAILURE);
+ }
+
+ if (argc > 1 && STREQ(argv[1], "--help"))
+ usage(EXIT_SUCCESS);
+ if (argc < 4)
+ usage(EXIT_FAILURE);
+
+ args.sun_path = argv[1];
+ if (virStrToLong_i(argv[2], NULL, 10, &args.nchannels) < 0)
+ fprintf(stderr, _("%s: malformed number of channels N %s"),
program_name, argv[2]);
+
+ if (argc < 4 + args.nchannels)
+ usage(EXIT_FAILURE);
+
+ args.conn = g_new0(multiFdConnData, args.nchannels + 1);
+
+ for (idx = 3; idx < 3 + args.nchannels + 1; idx++) {
+ multiFdConnData *c = &args.conn[idx - 3];
+
+ if (virStrToLong_i(argv[idx], NULL, 10, &c->filefd) < 0) {
+ fprintf(stderr, _("%s: malformed FD %s"), program_name,
argv[idx]);
+ usage(EXIT_FAILURE);
+ }
+#ifndef F_GETFL
+#error "multifd-helper requires F_GETFL parameter of fcntl"
+#endif
+ c->oflags = fcntl(c->filefd, F_GETFL);
+ if ((c->oflags & O_ACCMODE) == O_RDONLY) {
+ func = loadThreadFunc;
+ }
+ }
+
+ /* initialize server address structure */
+ memset(&args.serv_addr, 0, sizeof(args.serv_addr));
+ args.serv_addr.sun_family = AF_UNIX;
+ virStrcpyStatic(args.serv_addr.sun_path, args.sun_path);
+
+ if (virThreadCreate(&tid, true, func, &args) < 0) {
+ virReportSystemError(errno, _("%s: failed to create server thread"),
program_name);
+ exit(EXIT_FAILURE);
+ }
+
+ if (virThreadJoinRet(&tid) < 0)
+ exit(EXIT_FAILURE);
+
+ if (args.total < 0)
+ exit(EXIT_FAILURE);
+
+ exit(EXIT_SUCCESS);
+}
diff --git a/src/util/virthread.c b/src/util/virthread.c
index 5422bb74fd..0f6c6a68fa 100644
--- a/src/util/virthread.c
+++ b/src/util/virthread.c
@@ -348,6 +348,11 @@ void virThreadJoin(virThread *thread)
pthread_join(thread->thread, NULL);
}
+int virThreadJoinRet(virThread *thread)
+{
+ return pthread_join(thread->thread, NULL);
+}
+
void virThreadCancel(virThread *thread)
{
pthread_cancel(thread->thread);
diff --git a/src/util/virthread.h b/src/util/virthread.h
index 23abe0b6c9..5cecb9bd8a 100644
--- a/src/util/virthread.h
+++ b/src/util/virthread.h
@@ -89,6 +89,7 @@ int virThreadCreateFull(virThread *thread,
void virThreadSelf(virThread *thread);
bool virThreadIsSelf(virThread *thread);
void virThreadJoin(virThread *thread);
+int virThreadJoinRet(virThread *thread);
size_t virThreadMaxName(void);
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 06/20] libvirt: introduce virDomainSaveParametersFlags public API
add new API in order to be able to extend parameters to the domain
save operation. We will use it to fit the existing arguments of
VirDomainSaveFlags, and then add parallel saves functionality.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
include/libvirt/libvirt-domain.h | 45 ++++++++++++++++++++++++++++
src/driver-hypervisor.h | 7 +++++
src/libvirt-domain.c | 51 ++++++++++++++++++++++++++++++++
src/libvirt_public.syms | 5 ++++
4 files changed, 108 insertions(+)
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 9aa214f3df..b870a73b64 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -1481,6 +1481,8 @@ typedef enum {
VIR_DOMAIN_SAVE_RUNNING = 1 << 1, /* Favor running over paused */
VIR_DOMAIN_SAVE_PAUSED = 1 << 2, /* Favor paused over running */
VIR_DOMAIN_SAVE_RESET_NVRAM = 1 << 3, /* Re-initialize NVRAM from template */
+ /** Since: v8.3.0 */
+ VIR_DOMAIN_SAVE_PARALLEL = 1 << 4, /* Parallel Save/Restore to multiple
files */
} virDomainSaveRestoreFlags;
int virDomainSave (virDomainPtr domain,
@@ -1489,6 +1491,10 @@ int virDomainSaveFlags (virDomainPtr
domain,
const char *to,
const char *dxml,
unsigned int flags);
+int virDomainSaveParametersFlags (virDomainPtr domain,
+ virTypedParameterPtr params,
+ int nparams,
+ unsigned int flags);
int virDomainRestore (virConnectPtr conn,
const char *from);
int virDomainRestoreFlags (virConnectPtr conn,
@@ -1496,6 +1502,45 @@ int virDomainRestoreFlags (virConnectPtr
conn,
const char *dxml,
unsigned int flags);
+/**
+ * VIR_SAVE_PARAM_FILE:
+ *
+ * the parameter used to specify the savestate file to save to or restore from.
+ * For parallel saves, this is the main file, with the extra connections adding suffix
+ * .1 .2 .3 ... up to VIR_SAVE_PARAM_PARALLEL_CONNECTIONS.
+ *
+ * Since: v8.3.0
+ */
+# define VIR_SAVE_PARAM_FILE "file"
+
+/**
+ * VIR_SAVE_PARAM_DXML:
+ *
+ * an optional parameter used to adjust guest xml on restore.
+ * If the hypervisor supports it, it can be used to alter
+ * host-specific portions of the domain XML that will be used when
+ * restoring an image. For example, it is possible to alter the
+ * device while the domain is stopped.
+ *
+ * Since: v8.3.0
+ */
+# define VIR_SAVE_PARAM_DXML "dxml"
+
+/**
+ * VIR_SAVE_PARAM_PARALLEL_CONNECTIONS:
+ *
+ * this optional parameter mirrors the migration parameter
+ * VIR_MIGRATE_PARAM_PARALLEL_CONNECTIONS.
+ *
+ * This parameter is used when saving or restoring state files
+ * in parallel using the flag VIR_DOMAIN_SAVE_PARALLEL .
+ * It specifies the number of extra files to save/restore
+ * using parallel connections.
+ *
+ * Since: v8.3.0
+ */
+# define VIR_SAVE_PARAM_PARALLEL_CONNECTIONS "parallel.connections"
+
/* See below for virDomainSaveImageXMLFlags */
char * virDomainSaveImageGetXMLDesc (virConnectPtr conn,
const char *file,
diff --git a/src/driver-hypervisor.h b/src/driver-hypervisor.h
index 4423eb0885..a4e1d21e76 100644
--- a/src/driver-hypervisor.h
+++ b/src/driver-hypervisor.h
@@ -240,6 +240,12 @@ typedef int
const char *dxml,
unsigned int flags);
+typedef int
+(*virDrvDomainSaveParametersFlags)(virDomainPtr domain,
+ virTypedParameterPtr params,
+ int nparams,
+ unsigned int flags);
+
typedef int
(*virDrvDomainRestore)(virConnectPtr conn,
const char *from);
@@ -1489,6 +1495,7 @@ struct _virHypervisorDriver {
virDrvDomainGetControlInfo domainGetControlInfo;
virDrvDomainSave domainSave;
virDrvDomainSaveFlags domainSaveFlags;
+ virDrvDomainSaveParametersFlags domainSaveParametersFlags;
virDrvDomainRestore domainRestore;
virDrvDomainRestoreFlags domainRestoreFlags;
virDrvDomainSaveImageGetXMLDesc domainSaveImageGetXMLDesc;
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index cbd7902d2d..9e4fcfd022 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -959,6 +959,57 @@ virDomainSaveFlags(virDomainPtr domain, const char *to,
return -1;
}
+/**
+ * virDomainSaveParametersFlags:
+ * @domain: a domain object
+ * @params: save parameters
+ * @nparams: number of save parameters
+ * @flags: bitwise-OR of virDomainSaveRestoreFlags
+ *
+ * This method extends virDomainSaveFlags by adding parameters to Save.
+ *
+ * If @flags includes VIR_DOMAIN_SAVE_PARALLEL, then libvirt will
+ * attempt to trigger a parallel transfer to multiple files,
+ * where the number of extra files is determined by the parameter
+ * VIR_SAVE_PARAM_PARALLEL_CONNECTIONS.
+ *
+ * Returns 0 in case of success and -1 in case of failure.
+ */
+int
+virDomainSaveParametersFlags(virDomainPtr domain,
+ virTypedParameterPtr params, int nparams,
+ unsigned int flags)
+{
+ virConnectPtr conn;
+
+ VIR_DOMAIN_DEBUG(domain, "params=%p, nparams=%d, flags=0x%x",
+ params, nparams, flags);
+ VIR_TYPED_PARAMS_DEBUG(params, nparams);
+
+ virResetLastError();
+
+ virCheckDomainReturn(domain, -1);
+ conn = domain->conn;
+
+ virCheckReadOnlyGoto(conn->flags, error);
+
+ VIR_EXCLUSIVE_FLAGS_GOTO(VIR_DOMAIN_SAVE_RUNNING,
+ VIR_DOMAIN_SAVE_PAUSED,
+ error);
+
+ if (conn->driver->domainSaveParametersFlags) {
+ if (conn->driver->domainSaveParametersFlags(domain, params, nparams, flags)
< 0)
+ goto error;
+ return 0;
+ }
+
+ virReportUnsupportedError();
+
+ error:
+ virDispatchError(domain->conn);
+ return -1;
+}
+
/**
* virDomainRestore:
diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
index f93692c427..eb3a7afb75 100644
--- a/src/libvirt_public.syms
+++ b/src/libvirt_public.syms
@@ -916,4 +916,9 @@ LIBVIRT_8.0.0 {
virDomainSetLaunchSecurityState;
} LIBVIRT_7.8.0;
+LIBVIRT_8.3.0 {
+ global:
+ virDomainSaveParametersFlags;
+} LIBVIRT_8.0.0;
+
# .... define new API here using predicted next version number ....
--
2.34.1
4:05 a.m.
New subject: [libvirt RFCv4 06/20] libvirt: introduce virDomainSaveParametersFlags public API
On Wed, Apr 27, 2022 at 11:13:25PM +0200, Claudio Fontana wrote:
add new API in order to be able to extend parameters to the domain
save operation. We will use it to fit the existing arguments of
VirDomainSaveFlags, and then add parallel saves functionality.
Regardless of my thoughts on the parallel save to multiple files,
I think this API is conceptually a benefit, given it is more
extensible long term. Likewise for the restore counterpart.
Could you split off the new save/restore APIs into a standalone
patch series, that simply wires them up with the existing
functionality. That way we can get the APIs merged without being
blocked on any ongoing parallel save design debate.
IOW, this patch and the next 5 that follow could be merged
fairly easily, if the VIR_DOMAIN_SAVE_PARALLEL flag is added
in a later patch.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
include/libvirt/libvirt-domain.h | 45 ++++++++++++++++++++++++++++
src/driver-hypervisor.h | 7 +++++
src/libvirt-domain.c | 51 ++++++++++++++++++++++++++++++++
src/libvirt_public.syms | 5 ++++
4 files changed, 108 insertions(+)
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 9aa214f3df..b870a73b64 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -1481,6 +1481,8 @@ typedef enum {
VIR_DOMAIN_SAVE_RUNNING = 1 << 1, /* Favor running over paused */
VIR_DOMAIN_SAVE_PAUSED = 1 << 2, /* Favor paused over running */
VIR_DOMAIN_SAVE_RESET_NVRAM = 1 << 3, /* Re-initialize NVRAM from template
*/
+ /** Since: v8.3.0 */
+ VIR_DOMAIN_SAVE_PARALLEL = 1 << 4, /* Parallel Save/Restore to multiple
files */
} virDomainSaveRestoreFlags;
int virDomainSave (virDomainPtr domain,
@@ -1489,6 +1491,10 @@ int virDomainSaveFlags (virDomainPtr
domain,
const char *to,
const char *dxml,
unsigned int flags);
+int virDomainSaveParametersFlags (virDomainPtr domain,
+ virTypedParameterPtr params,
+ int nparams,
+ unsigned int flags);
int virDomainRestore (virConnectPtr conn,
const char *from);
int virDomainRestoreFlags (virConnectPtr conn,
@@ -1496,6 +1502,45 @@ int virDomainRestoreFlags (virConnectPtr
conn,
const char *dxml,
unsigned int flags);
+/**
+ * VIR_SAVE_PARAM_FILE:
+ *
+ * the parameter used to specify the savestate file to save to or restore from.
+ * For parallel saves, this is the main file, with the extra connections adding suffix
+ * .1 .2 .3 ... up to VIR_SAVE_PARAM_PARALLEL_CONNECTIONS.
+ *
+ * Since: v8.3.0
+ */
+# define VIR_SAVE_PARAM_FILE "file"
+
+/**
+ * VIR_SAVE_PARAM_DXML:
+ *
+ * an optional parameter used to adjust guest xml on restore.
+ * If the hypervisor supports it, it can be used to alter
+ * host-specific portions of the domain XML that will be used when
+ * restoring an image. For example, it is possible to alter the
+ * device while the domain is stopped.
+ *
+ * Since: v8.3.0
+ */
+# define VIR_SAVE_PARAM_DXML "dxml"
+
+/**
+ * VIR_SAVE_PARAM_PARALLEL_CONNECTIONS:
+ *
+ * this optional parameter mirrors the migration parameter
+ * VIR_MIGRATE_PARAM_PARALLEL_CONNECTIONS.
+ *
+ * This parameter is used when saving or restoring state files
+ * in parallel using the flag VIR_DOMAIN_SAVE_PARALLEL .
+ * It specifies the number of extra files to save/restore
+ * using parallel connections.
+ *
+ * Since: v8.3.0
+ */
+# define VIR_SAVE_PARAM_PARALLEL_CONNECTIONS "parallel.connections"
+
/* See below for virDomainSaveImageXMLFlags */
char * virDomainSaveImageGetXMLDesc (virConnectPtr conn,
const char *file,
diff --git a/src/driver-hypervisor.h b/src/driver-hypervisor.h
index 4423eb0885..a4e1d21e76 100644
--- a/src/driver-hypervisor.h
+++ b/src/driver-hypervisor.h
@@ -240,6 +240,12 @@ typedef int
const char *dxml,
unsigned int flags);
+typedef int
+(*virDrvDomainSaveParametersFlags)(virDomainPtr domain,
+ virTypedParameterPtr params,
+ int nparams,
+ unsigned int flags);
+
typedef int
(*virDrvDomainRestore)(virConnectPtr conn,
const char *from);
@@ -1489,6 +1495,7 @@ struct _virHypervisorDriver {
virDrvDomainGetControlInfo domainGetControlInfo;
virDrvDomainSave domainSave;
virDrvDomainSaveFlags domainSaveFlags;
+ virDrvDomainSaveParametersFlags domainSaveParametersFlags;
virDrvDomainRestore domainRestore;
virDrvDomainRestoreFlags domainRestoreFlags;
virDrvDomainSaveImageGetXMLDesc domainSaveImageGetXMLDesc;
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index cbd7902d2d..9e4fcfd022 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -959,6 +959,57 @@ virDomainSaveFlags(virDomainPtr domain, const char *to,
return -1;
}
+/**
+ * virDomainSaveParametersFlags:
+ * @domain: a domain object
+ * @params: save parameters
+ * @nparams: number of save parameters
+ * @flags: bitwise-OR of virDomainSaveRestoreFlags
+ *
+ * This method extends virDomainSaveFlags by adding parameters to Save.
+ *
+ * If @flags includes VIR_DOMAIN_SAVE_PARALLEL, then libvirt will
+ * attempt to trigger a parallel transfer to multiple files,
+ * where the number of extra files is determined by the parameter
+ * VIR_SAVE_PARAM_PARALLEL_CONNECTIONS.
+ *
+ * Returns 0 in case of success and -1 in case of failure.
+ */
+int
+virDomainSaveParametersFlags(virDomainPtr domain,
+ virTypedParameterPtr params, int nparams,
+ unsigned int flags)
+{
+ virConnectPtr conn;
+
+ VIR_DOMAIN_DEBUG(domain, "params=%p, nparams=%d, flags=0x%x",
+ params, nparams, flags);
+ VIR_TYPED_PARAMS_DEBUG(params, nparams);
+
+ virResetLastError();
+
+ virCheckDomainReturn(domain, -1);
+ conn = domain->conn;
+
+ virCheckReadOnlyGoto(conn->flags, error);
+
+ VIR_EXCLUSIVE_FLAGS_GOTO(VIR_DOMAIN_SAVE_RUNNING,
+ VIR_DOMAIN_SAVE_PAUSED,
+ error);
+
+ if (conn->driver->domainSaveParametersFlags) {
+ if (conn->driver->domainSaveParametersFlags(domain, params, nparams,
flags) < 0)
+ goto error;
+ return 0;
+ }
+
+ virReportUnsupportedError();
+
+ error:
+ virDispatchError(domain->conn);
+ return -1;
+}
+
/**
* virDomainRestore:
diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
index f93692c427..eb3a7afb75 100644
--- a/src/libvirt_public.syms
+++ b/src/libvirt_public.syms
@@ -916,4 +916,9 @@ LIBVIRT_8.0.0 {
virDomainSetLaunchSecurityState;
} LIBVIRT_7.8.0;
+LIBVIRT_8.3.0 {
+ global:
+ virDomainSaveParametersFlags;
+} LIBVIRT_8.0.0;
+
# .... define new API here using predicted next version number ....
--
2.34.1
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
5:47 a.m.
New subject: [libvirt RFCv4 06/20] libvirt: introduce virDomainSaveParametersFlags public API
On 4/28/22 11:05 AM, Daniel P. Berrangé wrote:
On Wed, Apr 27, 2022 at 11:13:25PM +0200, Claudio Fontana wrote:
> add new API in order to be able to extend parameters to the domain
> save operation. We will use it to fit the existing arguments of
> VirDomainSaveFlags, and then add parallel saves functionality.
Regardless of my thoughts on the parallel save to multiple files,
I think this API is conceptually a benefit, given it is more
extensible long term. Likewise for the restore counterpart.
Could you split off the new save/restore APIs into a standalone
patch series, that simply wires them up with the existing
functionality. That way we can get the APIs merged without being
blocked on any ongoing parallel save design debate.
IOW, this patch and the next 5 that follow could be merged
fairly easily, if the VIR_DOMAIN_SAVE_PARALLEL flag is added
in a later patch.
Absolutely, will work on it.
>
> Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
> ---
> include/libvirt/libvirt-domain.h | 45 ++++++++++++++++++++++++++++
> src/driver-hypervisor.h | 7 +++++
> src/libvirt-domain.c | 51 ++++++++++++++++++++++++++++++++
> src/libvirt_public.syms | 5 ++++
> 4 files changed, 108 insertions(+)
>
> diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
> index 9aa214f3df..b870a73b64 100644
> --- a/include/libvirt/libvirt-domain.h
> +++ b/include/libvirt/libvirt-domain.h
> @@ -1481,6 +1481,8 @@ typedef enum {
> VIR_DOMAIN_SAVE_RUNNING = 1 << 1, /* Favor running over paused */
> VIR_DOMAIN_SAVE_PAUSED = 1 << 2, /* Favor paused over running */
> VIR_DOMAIN_SAVE_RESET_NVRAM = 1 << 3, /* Re-initialize NVRAM from
template */
> + /** Since: v8.3.0 */
> + VIR_DOMAIN_SAVE_PARALLEL = 1 << 4, /* Parallel Save/Restore to
multiple files */
> } virDomainSaveRestoreFlags;
>
> int virDomainSave (virDomainPtr domain,
> @@ -1489,6 +1491,10 @@ int virDomainSaveFlags (virDomainPtr
domain,
> const char *to,
> const char *dxml,
> unsigned int flags);
> +int virDomainSaveParametersFlags (virDomainPtr domain,
> + virTypedParameterPtr params,
> + int nparams,
> + unsigned int flags);
> int virDomainRestore (virConnectPtr conn,
> const char *from);
> int virDomainRestoreFlags (virConnectPtr conn,
> @@ -1496,6 +1502,45 @@ int virDomainRestoreFlags (virConnectPtr
conn,
> const char *dxml,
> unsigned int flags);
>
> +/**
> + * VIR_SAVE_PARAM_FILE:
> + *
> + * the parameter used to specify the savestate file to save to or restore from.
> + * For parallel saves, this is the main file, with the extra connections adding
suffix
> + * .1 .2 .3 ... up to VIR_SAVE_PARAM_PARALLEL_CONNECTIONS.
> + *
> + * Since: v8.3.0
> + */
> +# define VIR_SAVE_PARAM_FILE "file"
> +
> +/**
> + * VIR_SAVE_PARAM_DXML:
> + *
> + * an optional parameter used to adjust guest xml on restore.
> + * If the hypervisor supports it, it can be used to alter
> + * host-specific portions of the domain XML that will be used when
> + * restoring an image. For example, it is possible to alter the
> + * device while the domain is stopped.
> + *
> + * Since: v8.3.0
> + */
> +# define VIR_SAVE_PARAM_DXML "dxml"
> +
> +/**
> + * VIR_SAVE_PARAM_PARALLEL_CONNECTIONS:
> + *
> + * this optional parameter mirrors the migration parameter
> + * VIR_MIGRATE_PARAM_PARALLEL_CONNECTIONS.
> + *
> + * This parameter is used when saving or restoring state files
> + * in parallel using the flag VIR_DOMAIN_SAVE_PARALLEL .
> + * It specifies the number of extra files to save/restore
> + * using parallel connections.
> + *
> + * Since: v8.3.0
> + */
> +# define VIR_SAVE_PARAM_PARALLEL_CONNECTIONS "parallel.connections"
> +
> /* See below for virDomainSaveImageXMLFlags */
> char * virDomainSaveImageGetXMLDesc (virConnectPtr conn,
> const char *file,
> diff --git a/src/driver-hypervisor.h b/src/driver-hypervisor.h
> index 4423eb0885..a4e1d21e76 100644
> --- a/src/driver-hypervisor.h
> +++ b/src/driver-hypervisor.h
> @@ -240,6 +240,12 @@ typedef int
> const char *dxml,
> unsigned int flags);
>
> +typedef int
> +(*virDrvDomainSaveParametersFlags)(virDomainPtr domain,
> + virTypedParameterPtr params,
> + int nparams,
> + unsigned int flags);
> +
> typedef int
> (*virDrvDomainRestore)(virConnectPtr conn,
> const char *from);
> @@ -1489,6 +1495,7 @@ struct _virHypervisorDriver {
> virDrvDomainGetControlInfo domainGetControlInfo;
> virDrvDomainSave domainSave;
> virDrvDomainSaveFlags domainSaveFlags;
> + virDrvDomainSaveParametersFlags domainSaveParametersFlags;
> virDrvDomainRestore domainRestore;
> virDrvDomainRestoreFlags domainRestoreFlags;
> virDrvDomainSaveImageGetXMLDesc domainSaveImageGetXMLDesc;
> diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
> index cbd7902d2d..9e4fcfd022 100644
> --- a/src/libvirt-domain.c
> +++ b/src/libvirt-domain.c
> @@ -959,6 +959,57 @@ virDomainSaveFlags(virDomainPtr domain, const char *to,
> return -1;
> }
>
> +/**
> + * virDomainSaveParametersFlags:
> + * @domain: a domain object
> + * @params: save parameters
> + * @nparams: number of save parameters
> + * @flags: bitwise-OR of virDomainSaveRestoreFlags
> + *
> + * This method extends virDomainSaveFlags by adding parameters to Save.
> + *
> + * If @flags includes VIR_DOMAIN_SAVE_PARALLEL, then libvirt will
> + * attempt to trigger a parallel transfer to multiple files,
> + * where the number of extra files is determined by the parameter
> + * VIR_SAVE_PARAM_PARALLEL_CONNECTIONS.
> + *
> + * Returns 0 in case of success and -1 in case of failure.
> + */
> +int
> +virDomainSaveParametersFlags(virDomainPtr domain,
> + virTypedParameterPtr params, int nparams,
> + unsigned int flags)
> +{
> + virConnectPtr conn;
> +
> + VIR_DOMAIN_DEBUG(domain, "params=%p, nparams=%d, flags=0x%x",
> + params, nparams, flags);
> + VIR_TYPED_PARAMS_DEBUG(params, nparams);
> +
> + virResetLastError();
> +
> + virCheckDomainReturn(domain, -1);
> + conn = domain->conn;
> +
> + virCheckReadOnlyGoto(conn->flags, error);
> +
> + VIR_EXCLUSIVE_FLAGS_GOTO(VIR_DOMAIN_SAVE_RUNNING,
> + VIR_DOMAIN_SAVE_PAUSED,
> + error);
> +
> + if (conn->driver->domainSaveParametersFlags) {
> + if (conn->driver->domainSaveParametersFlags(domain, params, nparams,
flags) < 0)
> + goto error;
> + return 0;
> + }
> +
> + virReportUnsupportedError();
> +
> + error:
> + virDispatchError(domain->conn);
> + return -1;
> +}
> +
>
> /**
> * virDomainRestore:
> diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
> index f93692c427..eb3a7afb75 100644
> --- a/src/libvirt_public.syms
> +++ b/src/libvirt_public.syms
> @@ -916,4 +916,9 @@ LIBVIRT_8.0.0 {
> virDomainSetLaunchSecurityState;
> } LIBVIRT_7.8.0;
>
> +LIBVIRT_8.3.0 {
> + global:
> + virDomainSaveParametersFlags;
> +} LIBVIRT_8.0.0;
> +
> # .... define new API here using predicted next version number ....
> --
> 2.34.1
>
With regards,
Daniel
4:12 a.m.
New subject: [libvirt RFCv4 06/20] libvirt: introduce virDomainSaveParametersFlags public API
On Wed, Apr 27, 2022 at 11:13:25PM +0200, Claudio Fontana wrote:
add new API in order to be able to extend parameters to the domain
save operation. We will use it to fit the existing arguments of
VirDomainSaveFlags, and then add parallel saves functionality.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
include/libvirt/libvirt-domain.h | 45 ++++++++++++++++++++++++++++
src/driver-hypervisor.h | 7 +++++
src/libvirt-domain.c | 51 ++++++++++++++++++++++++++++++++
src/libvirt_public.syms | 5 ++++
4 files changed, 108 insertions(+)
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 9aa214f3df..b870a73b64 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -1481,6 +1481,8 @@ typedef enum {
VIR_DOMAIN_SAVE_RUNNING = 1 << 1, /* Favor running over paused */
VIR_DOMAIN_SAVE_PAUSED = 1 << 2, /* Favor paused over running */
VIR_DOMAIN_SAVE_RESET_NVRAM = 1 << 3, /* Re-initialize NVRAM from template
*/
+ /** Since: v8.3.0 */
+ VIR_DOMAIN_SAVE_PARALLEL = 1 << 4, /* Parallel Save/Restore to multiple
files */
} virDomainSaveRestoreFlags;
int virDomainSave (virDomainPtr domain,
@@ -1489,6 +1491,10 @@ int virDomainSaveFlags (virDomainPtr
domain,
const char *to,
const char *dxml,
unsigned int flags);
+int virDomainSaveParametersFlags (virDomainPtr domain,
+ virTypedParameterPtr params,
+ int nparams,
+ unsigned int flags);
BTW, we don't need 'Flags' as a suffix here. We only add 'Flags'
suffixes
when we had an existing API that was missing flags and need a new unique
name. I'd also probably shorten to 'Params', eg in this case, it is
sufficient to have virDomainSaveParams and virDomainRestoreParams.
int virDomainRestore (virConnectPtr
conn,
const char *from);
int virDomainRestoreFlags (virConnectPtr conn,
@@ -1496,6 +1502,45 @@ int virDomainRestoreFlags (virConnectPtr
conn,
const char *dxml,
unsigned int flags);
+/**
+ * VIR_SAVE_PARAM_FILE:
+ *
+ * the parameter used to specify the savestate file to save to or restore from.
+ * For parallel saves, this is the main file, with the extra connections adding suffix
+ * .1 .2 .3 ... up to VIR_SAVE_PARAM_PARALLEL_CONNECTIONS.
+ *
+ * Since: v8.3.0
+ */
+# define VIR_SAVE_PARAM_FILE "file"
+
+/**
+ * VIR_SAVE_PARAM_DXML:
+ *
+ * an optional parameter used to adjust guest xml on restore.
+ * If the hypervisor supports it, it can be used to alter
+ * host-specific portions of the domain XML that will be used when
+ * restoring an image. For example, it is possible to alter the
+ * device while the domain is stopped.
+ *
+ * Since: v8.3.0
+ */
+# define VIR_SAVE_PARAM_DXML "dxml"
+
+/**
+ * VIR_SAVE_PARAM_PARALLEL_CONNECTIONS:
+ *
+ * this optional parameter mirrors the migration parameter
+ * VIR_MIGRATE_PARAM_PARALLEL_CONNECTIONS.
+ *
+ * This parameter is used when saving or restoring state files
+ * in parallel using the flag VIR_DOMAIN_SAVE_PARALLEL .
+ * It specifies the number of extra files to save/restore
+ * using parallel connections.
+ *
+ * Since: v8.3.0
+ */
+# define VIR_SAVE_PARAM_PARALLEL_CONNECTIONS "parallel.connections"
+
/* See below for virDomainSaveImageXMLFlags */
char * virDomainSaveImageGetXMLDesc (virConnectPtr conn,
const char *file,
diff --git a/src/driver-hypervisor.h b/src/driver-hypervisor.h
index 4423eb0885..a4e1d21e76 100644
--- a/src/driver-hypervisor.h
+++ b/src/driver-hypervisor.h
@@ -240,6 +240,12 @@ typedef int
const char *dxml,
unsigned int flags);
+typedef int
+(*virDrvDomainSaveParametersFlags)(virDomainPtr domain,
+ virTypedParameterPtr params,
+ int nparams,
+ unsigned int flags);
+
typedef int
(*virDrvDomainRestore)(virConnectPtr conn,
const char *from);
@@ -1489,6 +1495,7 @@ struct _virHypervisorDriver {
virDrvDomainGetControlInfo domainGetControlInfo;
virDrvDomainSave domainSave;
virDrvDomainSaveFlags domainSaveFlags;
+ virDrvDomainSaveParametersFlags domainSaveParametersFlags;
virDrvDomainRestore domainRestore;
virDrvDomainRestoreFlags domainRestoreFlags;
virDrvDomainSaveImageGetXMLDesc domainSaveImageGetXMLDesc;
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index cbd7902d2d..9e4fcfd022 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -959,6 +959,57 @@ virDomainSaveFlags(virDomainPtr domain, const char *to,
return -1;
}
+/**
+ * virDomainSaveParametersFlags:
+ * @domain: a domain object
+ * @params: save parameters
+ * @nparams: number of save parameters
+ * @flags: bitwise-OR of virDomainSaveRestoreFlags
+ *
+ * This method extends virDomainSaveFlags by adding parameters to Save.
+ *
+ * If @flags includes VIR_DOMAIN_SAVE_PARALLEL, then libvirt will
+ * attempt to trigger a parallel transfer to multiple files,
+ * where the number of extra files is determined by the parameter
+ * VIR_SAVE_PARAM_PARALLEL_CONNECTIONS.
+ *
+ * Returns 0 in case of success and -1 in case of failure.
+ */
+int
+virDomainSaveParametersFlags(virDomainPtr domain,
+ virTypedParameterPtr params, int nparams,
+ unsigned int flags)
+{
+ virConnectPtr conn;
+
+ VIR_DOMAIN_DEBUG(domain, "params=%p, nparams=%d, flags=0x%x",
+ params, nparams, flags);
+ VIR_TYPED_PARAMS_DEBUG(params, nparams);
+
+ virResetLastError();
+
+ virCheckDomainReturn(domain, -1);
+ conn = domain->conn;
+
+ virCheckReadOnlyGoto(conn->flags, error);
+
+ VIR_EXCLUSIVE_FLAGS_GOTO(VIR_DOMAIN_SAVE_RUNNING,
+ VIR_DOMAIN_SAVE_PAUSED,
+ error);
+
+ if (conn->driver->domainSaveParametersFlags) {
+ if (conn->driver->domainSaveParametersFlags(domain, params, nparams,
flags) < 0)
+ goto error;
+ return 0;
+ }
+
+ virReportUnsupportedError();
+
+ error:
+ virDispatchError(domain->conn);
+ return -1;
+}
+
/**
* virDomainRestore:
diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
index f93692c427..eb3a7afb75 100644
--- a/src/libvirt_public.syms
+++ b/src/libvirt_public.syms
@@ -916,4 +916,9 @@ LIBVIRT_8.0.0 {
virDomainSetLaunchSecurityState;
} LIBVIRT_7.8.0;
+LIBVIRT_8.3.0 {
+ global:
+ virDomainSaveParametersFlags;
+} LIBVIRT_8.0.0;
+
# .... define new API here using predicted next version number ....
--
2.34.1
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
4:26 a.m.
New subject: [libvirt RFCv4 06/20] libvirt: introduce virDomainSaveParametersFlags public API
On 4/28/22 11:12 AM, Daniel P. Berrangé wrote:
On Wed, Apr 27, 2022 at 11:13:25PM +0200, Claudio Fontana wrote:
> add new API in order to be able to extend parameters to the domain
> save operation. We will use it to fit the existing arguments of
> VirDomainSaveFlags, and then add parallel saves functionality.
>
> Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
> ---
> include/libvirt/libvirt-domain.h | 45 ++++++++++++++++++++++++++++
> src/driver-hypervisor.h | 7 +++++
> src/libvirt-domain.c | 51 ++++++++++++++++++++++++++++++++
> src/libvirt_public.syms | 5 ++++
> 4 files changed, 108 insertions(+)
>
> diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
> index 9aa214f3df..b870a73b64 100644
> --- a/include/libvirt/libvirt-domain.h
> +++ b/include/libvirt/libvirt-domain.h
> @@ -1481,6 +1481,8 @@ typedef enum {
> VIR_DOMAIN_SAVE_RUNNING = 1 << 1, /* Favor running over paused */
> VIR_DOMAIN_SAVE_PAUSED = 1 << 2, /* Favor paused over running */
> VIR_DOMAIN_SAVE_RESET_NVRAM = 1 << 3, /* Re-initialize NVRAM from
template */
> + /** Since: v8.3.0 */
> + VIR_DOMAIN_SAVE_PARALLEL = 1 << 4, /* Parallel Save/Restore to
multiple files */
> } virDomainSaveRestoreFlags;
>
> int virDomainSave (virDomainPtr domain,
> @@ -1489,6 +1491,10 @@ int virDomainSaveFlags (virDomainPtr
domain,
> const char *to,
> const char *dxml,
> unsigned int flags);
> +int virDomainSaveParametersFlags (virDomainPtr domain,
> + virTypedParameterPtr params,
> + int nparams,
> + unsigned int flags);
BTW, we don't need 'Flags' as a suffix here. We only add 'Flags'
suffixes
when we had an existing API that was missing flags and need a new unique
name. I'd also probably shorten to 'Params', eg in this case, it is
sufficient to have virDomainSaveParams and virDomainRestoreParams.
Ok, will do in the next spin.
> int virDomainRestore (virConnectPtr conn,
> const char *from);
> int virDomainRestoreFlags (virConnectPtr conn,
> @@ -1496,6 +1502,45 @@ int virDomainRestoreFlags (virConnectPtr
conn,
> const char *dxml,
> unsigned int flags);
>
> +/**
> + * VIR_SAVE_PARAM_FILE:
> + *
> + * the parameter used to specify the savestate file to save to or restore from.
> + * For parallel saves, this is the main file, with the extra connections adding
suffix
> + * .1 .2 .3 ... up to VIR_SAVE_PARAM_PARALLEL_CONNECTIONS.
> + *
> + * Since: v8.3.0
> + */
> +# define VIR_SAVE_PARAM_FILE "file"
> +
> +/**
> + * VIR_SAVE_PARAM_DXML:
> + *
> + * an optional parameter used to adjust guest xml on restore.
> + * If the hypervisor supports it, it can be used to alter
> + * host-specific portions of the domain XML that will be used when
> + * restoring an image. For example, it is possible to alter the
> + * device while the domain is stopped.
> + *
> + * Since: v8.3.0
> + */
> +# define VIR_SAVE_PARAM_DXML "dxml"
> +
> +/**
> + * VIR_SAVE_PARAM_PARALLEL_CONNECTIONS:
> + *
> + * this optional parameter mirrors the migration parameter
> + * VIR_MIGRATE_PARAM_PARALLEL_CONNECTIONS.
> + *
> + * This parameter is used when saving or restoring state files
> + * in parallel using the flag VIR_DOMAIN_SAVE_PARALLEL .
> + * It specifies the number of extra files to save/restore
> + * using parallel connections.
> + *
> + * Since: v8.3.0
> + */
> +# define VIR_SAVE_PARAM_PARALLEL_CONNECTIONS "parallel.connections"
> +
> /* See below for virDomainSaveImageXMLFlags */
> char * virDomainSaveImageGetXMLDesc (virConnectPtr conn,
> const char *file,
> diff --git a/src/driver-hypervisor.h b/src/driver-hypervisor.h
> index 4423eb0885..a4e1d21e76 100644
> --- a/src/driver-hypervisor.h
> +++ b/src/driver-hypervisor.h
> @@ -240,6 +240,12 @@ typedef int
> const char *dxml,
> unsigned int flags);
>
> +typedef int
> +(*virDrvDomainSaveParametersFlags)(virDomainPtr domain,
> + virTypedParameterPtr params,
> + int nparams,
> + unsigned int flags);
> +
> typedef int
> (*virDrvDomainRestore)(virConnectPtr conn,
> const char *from);
> @@ -1489,6 +1495,7 @@ struct _virHypervisorDriver {
> virDrvDomainGetControlInfo domainGetControlInfo;
> virDrvDomainSave domainSave;
> virDrvDomainSaveFlags domainSaveFlags;
> + virDrvDomainSaveParametersFlags domainSaveParametersFlags;
> virDrvDomainRestore domainRestore;
> virDrvDomainRestoreFlags domainRestoreFlags;
> virDrvDomainSaveImageGetXMLDesc domainSaveImageGetXMLDesc;
> diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
> index cbd7902d2d..9e4fcfd022 100644
> --- a/src/libvirt-domain.c
> +++ b/src/libvirt-domain.c
> @@ -959,6 +959,57 @@ virDomainSaveFlags(virDomainPtr domain, const char *to,
> return -1;
> }
>
> +/**
> + * virDomainSaveParametersFlags:
> + * @domain: a domain object
> + * @params: save parameters
> + * @nparams: number of save parameters
> + * @flags: bitwise-OR of virDomainSaveRestoreFlags
> + *
> + * This method extends virDomainSaveFlags by adding parameters to Save.
> + *
> + * If @flags includes VIR_DOMAIN_SAVE_PARALLEL, then libvirt will
> + * attempt to trigger a parallel transfer to multiple files,
> + * where the number of extra files is determined by the parameter
> + * VIR_SAVE_PARAM_PARALLEL_CONNECTIONS.
> + *
> + * Returns 0 in case of success and -1 in case of failure.
> + */
> +int
> +virDomainSaveParametersFlags(virDomainPtr domain,
> + virTypedParameterPtr params, int nparams,
> + unsigned int flags)
> +{
> + virConnectPtr conn;
> +
> + VIR_DOMAIN_DEBUG(domain, "params=%p, nparams=%d, flags=0x%x",
> + params, nparams, flags);
> + VIR_TYPED_PARAMS_DEBUG(params, nparams);
> +
> + virResetLastError();
> +
> + virCheckDomainReturn(domain, -1);
> + conn = domain->conn;
> +
> + virCheckReadOnlyGoto(conn->flags, error);
> +
> + VIR_EXCLUSIVE_FLAGS_GOTO(VIR_DOMAIN_SAVE_RUNNING,
> + VIR_DOMAIN_SAVE_PAUSED,
> + error);
> +
> + if (conn->driver->domainSaveParametersFlags) {
> + if (conn->driver->domainSaveParametersFlags(domain, params, nparams,
flags) < 0)
> + goto error;
> + return 0;
> + }
> +
> + virReportUnsupportedError();
> +
> + error:
> + virDispatchError(domain->conn);
> + return -1;
> +}
> +
>
> /**
> * virDomainRestore:
> diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
> index f93692c427..eb3a7afb75 100644
> --- a/src/libvirt_public.syms
> +++ b/src/libvirt_public.syms
> @@ -916,4 +916,9 @@ LIBVIRT_8.0.0 {
> virDomainSetLaunchSecurityState;
> } LIBVIRT_7.8.0;
>
> +LIBVIRT_8.3.0 {
> + global:
> + virDomainSaveParametersFlags;
> +} LIBVIRT_8.0.0;
> +
> # .... define new API here using predicted next version number ....
> --
> 2.34.1
>
With regards,
Daniel
4:13 p.m.
New subject: [libvirt RFCv4 07/20] libvirt: introduce virDomainRestoreParametersFlags public API
add new API in order to be able to extend parameters to the domain
restore operation. We will use it to fit the existing arguments of
VirDomainRestoreFlags, and then add parallel restore functionality.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
include/libvirt/libvirt-domain.h | 4 +++
src/driver-hypervisor.h | 7 +++++
src/libvirt-domain.c | 48 ++++++++++++++++++++++++++++++++
src/libvirt_public.syms | 1 +
4 files changed, 60 insertions(+)
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index b870a73b64..ec178a8150 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -1501,6 +1501,10 @@ int virDomainRestoreFlags (virConnectPtr
conn,
const char *from,
const char *dxml,
unsigned int flags);
+int virDomainRestoreParametersFlags (virConnectPtr conn,
+ virTypedParameterPtr params,
+ int nparams,
+ unsigned int flags);
/**
* VIR_SAVE_PARAM_FILE:
diff --git a/src/driver-hypervisor.h b/src/driver-hypervisor.h
index a4e1d21e76..e62e4c8f74 100644
--- a/src/driver-hypervisor.h
+++ b/src/driver-hypervisor.h
@@ -256,6 +256,12 @@ typedef int
const char *dxml,
unsigned int flags);
+typedef int
+(*virDrvDomainRestoreParametersFlags)(virConnectPtr conn,
+ virTypedParameterPtr params,
+ int nparams,
+ unsigned int flags);
+
typedef char *
(*virDrvDomainSaveImageGetXMLDesc)(virConnectPtr conn,
const char *file,
@@ -1498,6 +1504,7 @@ struct _virHypervisorDriver {
virDrvDomainSaveParametersFlags domainSaveParametersFlags;
virDrvDomainRestore domainRestore;
virDrvDomainRestoreFlags domainRestoreFlags;
+ virDrvDomainRestoreParametersFlags domainRestoreParametersFlags;
virDrvDomainSaveImageGetXMLDesc domainSaveImageGetXMLDesc;
virDrvDomainSaveImageDefineXML domainSaveImageDefineXML;
virDrvDomainCoreDump domainCoreDump;
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 9e4fcfd022..f967efa473 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -1140,6 +1140,54 @@ virDomainRestoreFlags(virConnectPtr conn, const char *from, const
char *dxml,
}
+/**
+ * virDomainRestoreParametersFlags:
+ * @conn: pointer to the hypervisor connection
+ * @params: restore parameters
+ * @nparams: number of restore parameters
+ * @flags: bitwise-OR of virDomainSaveRestoreFlags
+ *
+ * This method extends virDomainRestoreFlags by adding parameters to Restore.
+ *
+ * If @flags includes VIR_DOMAIN_SAVE_PARALLEL, then libvirt will
+ * attempt to restore from multiple files in parallel,
+ * where the number of extra files is determined by the parameter
+ * VIR_SAVE_PARAM_PARALLEL_CONNECTIONS.
+ *
+ * Returns 0 in case of success and -1 in case of failure.
+ */
+int
+virDomainRestoreParametersFlags(virConnectPtr conn,
+ virTypedParameterPtr params, int nparams,
+ unsigned int flags)
+{
+ VIR_DEBUG("conn=%p, params=%p, nparams=%d, flags=0x%x",
+ conn, params, nparams, flags);
+ VIR_TYPED_PARAMS_DEBUG(params, nparams);
+
+ virResetLastError();
+
+ virCheckConnectReturn(conn, -1);
+ virCheckReadOnlyGoto(conn->flags, error);
+
+ VIR_EXCLUSIVE_FLAGS_GOTO(VIR_DOMAIN_SAVE_RUNNING,
+ VIR_DOMAIN_SAVE_PAUSED,
+ error);
+
+ if (conn->driver->domainRestoreParametersFlags) {
+ if (conn->driver->domainRestoreParametersFlags(conn, params, nparams,
flags) < 0)
+ goto error;
+ return 0;
+ }
+
+ virReportUnsupportedError();
+
+ error:
+ virDispatchError(conn);
+ return -1;
+}
+
+
/**
* virDomainSaveImageGetXMLDesc:
* @conn: pointer to the hypervisor connection
diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
index eb3a7afb75..74c1464b38 100644
--- a/src/libvirt_public.syms
+++ b/src/libvirt_public.syms
@@ -919,6 +919,7 @@ LIBVIRT_8.0.0 {
LIBVIRT_8.3.0 {
global:
virDomainSaveParametersFlags;
+ virDomainRestoreParametersFlags;
} LIBVIRT_8.0.0;
# .... define new API here using predicted next version number ....
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 08/20] remote: Add RPC support for the virDomainSaveParametersFlags API
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/remote/remote_driver.c | 1 +
src/remote/remote_protocol.x | 17 ++++++++++++++++-
src/remote_protocol-structs | 9 +++++++++
3 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c
index 7e7a21fcab..1fc5d41971 100644
--- a/src/remote/remote_driver.c
+++ b/src/remote/remote_driver.c
@@ -8446,6 +8446,7 @@ static virHypervisorDriver hypervisor_driver = {
.domainGetControlInfo = remoteDomainGetControlInfo, /* 0.9.3 */
.domainSave = remoteDomainSave, /* 0.3.0 */
.domainSaveFlags = remoteDomainSaveFlags, /* 0.9.4 */
+ .domainSaveParametersFlags = remoteDomainSaveParametersFlags, /* 8.3.0 */
.domainRestore = remoteDomainRestore, /* 0.3.0 */
.domainRestoreFlags = remoteDomainRestoreFlags, /* 0.9.4 */
.domainSaveImageGetXMLDesc = remoteDomainSaveImageGetXMLDesc, /* 0.9.4 */
diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x
index 4f13cef662..c2ae5c5748 100644
--- a/src/remote/remote_protocol.x
+++ b/src/remote/remote_protocol.x
@@ -230,6 +230,9 @@ const REMOTE_NODE_MEMORY_PARAMETERS_MAX = 64;
/* Upper limit on migrate parameters */
const REMOTE_DOMAIN_MIGRATE_PARAM_LIST_MAX = 64;
+/* Upper limit on save/restore parameters */
+const REMOTE_DOMAIN_SAVE_PARAMS_MAX = 64;
+
/* Upper limit on number of job stats */
const REMOTE_DOMAIN_JOB_STATS_MAX = 64;
@@ -3227,6 +3230,12 @@ struct remote_domain_migrate_confirm3_params_args {
int cancelled;
};
+struct remote_domain_save_parameters_flags_args {
+ remote_nonnull_domain dom;
+ remote_typed_param params<REMOTE_DOMAIN_SAVE_PARAMS_MAX>;
+ unsigned int flags;
+};
+
/* The device removed event is the last event where we have to support
* dual forms for back-compat to older clients; all future events can
* use just the modern form with callbackID. */
@@ -6920,5 +6929,11 @@ enum remote_procedure {
* @generate: both
* @acl: domain:write
*/
- REMOTE_PROC_DOMAIN_SET_LAUNCH_SECURITY_STATE = 439
+ REMOTE_PROC_DOMAIN_SET_LAUNCH_SECURITY_STATE = 439,
+
+ /**
+ * @generate: both
+ * @acl: domain:hibernate
+ */
+ REMOTE_PROC_DOMAIN_SAVE_PARAMETERS_FLAGS = 440
};
diff --git a/src/remote_protocol-structs b/src/remote_protocol-structs
index d88176781d..89eadeb644 100644
--- a/src/remote_protocol-structs
+++ b/src/remote_protocol-structs
@@ -563,6 +563,14 @@ struct remote_domain_save_flags_args {
remote_string dxml;
u_int flags;
};
+struct remote_domain_save_parameters_flags_args {
+ remote_nonnull_domain dom;
+ struct {
+ u_int params_len;
+ remote_typed_param * params_val;
+ } params;
+ u_int flags;
+};
struct remote_domain_restore_args {
remote_nonnull_string from;
};
@@ -3689,4 +3697,5 @@ enum remote_procedure {
REMOTE_PROC_NETWORK_CREATE_XML_FLAGS = 437,
REMOTE_PROC_DOMAIN_EVENT_MEMORY_DEVICE_SIZE_CHANGE = 438,
REMOTE_PROC_DOMAIN_SET_LAUNCH_SECURITY_STATE = 439,
+ REMOTE_PROC_DOMAIN_SAVE_PARAMETERS_FLAGS = 440,
};
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 09/20] remote: Add RPC support for the virDomainRestoreParametersFlags API
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/remote/remote_driver.c | 1 +
src/remote/remote_protocol.x | 14 +++++++++++++-
src/remote_protocol-structs | 8 ++++++++
3 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c
index 1fc5d41971..c5b644ce49 100644
--- a/src/remote/remote_driver.c
+++ b/src/remote/remote_driver.c
@@ -8449,6 +8449,7 @@ static virHypervisorDriver hypervisor_driver = {
.domainSaveParametersFlags = remoteDomainSaveParametersFlags, /* 8.3.0 */
.domainRestore = remoteDomainRestore, /* 0.3.0 */
.domainRestoreFlags = remoteDomainRestoreFlags, /* 0.9.4 */
+ .domainRestoreParametersFlags = remoteDomainRestoreParametersFlags, /* 8.3.0 */
.domainSaveImageGetXMLDesc = remoteDomainSaveImageGetXMLDesc, /* 0.9.4 */
.domainSaveImageDefineXML = remoteDomainSaveImageDefineXML, /* 0.9.4 */
.domainCoreDump = remoteDomainCoreDump, /* 0.3.0 */
diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x
index c2ae5c5748..7b919ef375 100644
--- a/src/remote/remote_protocol.x
+++ b/src/remote/remote_protocol.x
@@ -3236,6 +3236,11 @@ struct remote_domain_save_parameters_flags_args {
unsigned int flags;
};
+struct remote_domain_restore_parameters_flags_args {
+ remote_typed_param params<REMOTE_DOMAIN_SAVE_PARAMS_MAX>;
+ unsigned int flags;
+};
+
/* The device removed event is the last event where we have to support
* dual forms for back-compat to older clients; all future events can
* use just the modern form with callbackID. */
@@ -6935,5 +6940,12 @@ enum remote_procedure {
* @generate: both
* @acl: domain:hibernate
*/
- REMOTE_PROC_DOMAIN_SAVE_PARAMETERS_FLAGS = 440
+ REMOTE_PROC_DOMAIN_SAVE_PARAMETERS_FLAGS = 440,
+
+ /**
+ * @generate: both
+ * @acl: domain:start
+ * @acl: domain:write
+ */
+ REMOTE_PROC_DOMAIN_RESTORE_PARAMETERS_FLAGS = 441
};
diff --git a/src/remote_protocol-structs b/src/remote_protocol-structs
index 89eadeb644..72e92184ca 100644
--- a/src/remote_protocol-structs
+++ b/src/remote_protocol-structs
@@ -579,6 +579,13 @@ struct remote_domain_restore_flags_args {
remote_string dxml;
u_int flags;
};
+struct remote_domain_restore_parameters_flags_args {
+ struct {
+ u_int params_len;
+ remote_typed_param * params_val;
+ } params;
+ u_int flags;
+};
struct remote_domain_save_image_get_xml_desc_args {
remote_nonnull_string file;
u_int flags;
@@ -3698,4 +3705,5 @@ enum remote_procedure {
REMOTE_PROC_DOMAIN_EVENT_MEMORY_DEVICE_SIZE_CHANGE = 438,
REMOTE_PROC_DOMAIN_SET_LAUNCH_SECURITY_STATE = 439,
REMOTE_PROC_DOMAIN_SAVE_PARAMETERS_FLAGS = 440,
+ REMOTE_PROC_DOMAIN_RESTORE_PARAMETERS_FLAGS = 441,
};
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 10/20] qemu: add a stub for virDomainSaveParametersFlags API
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/qemu/qemu_driver.c | 66 ++++++++++++++++++++++++++++++++++++---
src/qemu/qemu_saveimage.c | 1 +
src/qemu/qemu_saveimage.h | 1 +
src/qemu/qemu_snapshot.c | 2 +-
4 files changed, 65 insertions(+), 5 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index ee0963c30d..c341df5f8e 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -2641,7 +2641,7 @@ static int
qemuDomainSaveInternal(virQEMUDriver *driver,
virDomainObj *vm, const char *path,
int compressed, virCommand *compressor,
- const char *xmlin, unsigned int flags)
+ const char *xmlin, int nconn, unsigned int flags)
{
g_autofree char *xml = NULL;
bool was_running = false;
@@ -2722,7 +2722,7 @@ qemuDomainSaveInternal(virQEMUDriver *driver,
xml = NULL;
ret = qemuSaveImageCreate(driver, vm, path, data, compressor,
- flags, VIR_ASYNC_JOB_SAVE);
+ nconn, flags, VIR_ASYNC_JOB_SAVE);
if (ret < 0)
goto endjob;
@@ -2791,7 +2791,7 @@ qemuDomainSaveFlags(virDomainPtr dom, const char *path, const char
*dxml,
goto cleanup;
ret = qemuDomainSaveInternal(driver, vm, path, compressed,
- compressor, dxml, flags);
+ compressor, dxml, -1, flags);
cleanup:
virDomainObjEndAPI(&vm);
@@ -2804,6 +2804,63 @@ qemuDomainSave(virDomainPtr dom, const char *path)
return qemuDomainSaveFlags(dom, path, NULL, 0);
}
+static int
+qemuDomainSaveParametersFlags(virDomainPtr dom,
+ virTypedParameterPtr params, int nparams,
+ unsigned int flags)
+{
+ const char *to = NULL;
+ const char *dxml = NULL;
+ virQEMUDriver *driver = dom->conn->privateData;
+ int compressed;
+ g_autoptr(virCommand) compressor = NULL;
+ int ret = -1;
+ int nconn = 0;
+ virDomainObj *vm = NULL;
+ g_autoptr(virQEMUDriverConfig) cfg = NULL;
+
+ virCheckFlags(VIR_DOMAIN_SAVE_BYPASS_CACHE |
+ VIR_DOMAIN_SAVE_RUNNING |
+ VIR_DOMAIN_SAVE_PAUSED |
+ VIR_DOMAIN_SAVE_PARALLEL, -1);
+
+ if (virTypedParamsValidate(params, nparams,
+ VIR_SAVE_PARAM_FILE, VIR_TYPED_PARAM_STRING,
+ VIR_SAVE_PARAM_DXML, VIR_TYPED_PARAM_STRING,
+ VIR_SAVE_PARAM_PARALLEL_CONNECTIONS, VIR_TYPED_PARAM_INT,
+ NULL) < 0)
+ return -1;
+
+ if (virTypedParamsGetString(params, nparams, VIR_SAVE_PARAM_FILE, &to) < 0)
+ return -1;
+ if (virTypedParamsGetString(params, nparams, VIR_SAVE_PARAM_DXML, &dxml) < 0)
+ return -1;
+ if (virTypedParamsGetInt(params, nparams, VIR_SAVE_PARAM_PARALLEL_CONNECTIONS,
&nconn) < 0)
+ return -1;
+
+ cfg = virQEMUDriverGetConfig(driver);
+ if ((compressed = qemuSaveImageGetCompressionProgram(cfg->saveImageFormat,
+ &compressor,
+ "save", false)) <
0)
+ goto cleanup;
+
+ if (!(vm = qemuDomainObjFromDomain(dom)))
+ goto cleanup;
+
+ if (virDomainSaveParametersFlagsEnsureACL(dom->conn, vm->def) < 0)
+ goto cleanup;
+
+ if (virDomainObjCheckActive(vm) < 0)
+ goto cleanup;
+
+ ret = qemuDomainSaveInternal(driver, vm, to, compressed,
+ compressor, dxml, nconn, flags);
+
+ cleanup:
+ virDomainObjEndAPI(&vm);
+ return ret;
+}
+
static char *
qemuDomainManagedSavePath(virQEMUDriver *driver, virDomainObj *vm)
{
@@ -2854,7 +2911,7 @@ qemuDomainManagedSave(virDomainPtr dom, unsigned int flags)
VIR_INFO("Saving state of domain '%s' to '%s'",
vm->def->name, name);
ret = qemuDomainSaveInternal(driver, vm, name, compressed,
- compressor, NULL, flags);
+ compressor, NULL, -1, flags);
if (ret == 0)
vm->hasManagedSave = true;
@@ -20824,6 +20881,7 @@ static virHypervisorDriver qemuHypervisorDriver = {
.domainGetControlInfo = qemuDomainGetControlInfo, /* 0.9.3 */
.domainSave = qemuDomainSave, /* 0.2.0 */
.domainSaveFlags = qemuDomainSaveFlags, /* 0.9.4 */
+ .domainSaveParametersFlags = qemuDomainSaveParametersFlags, /* 8.3.0 */
.domainRestore = qemuDomainRestore, /* 0.2.0 */
.domainRestoreFlags = qemuDomainRestoreFlags, /* 0.9.4 */
.domainSaveImageGetXMLDesc = qemuDomainSaveImageGetXMLDesc, /* 0.9.4 */
diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
index 4fd4c5cfcd..7c76db359e 100644
--- a/src/qemu/qemu_saveimage.c
+++ b/src/qemu/qemu_saveimage.c
@@ -258,6 +258,7 @@ qemuSaveImageCreate(virQEMUDriver *driver,
const char *path,
virQEMUSaveData *data,
virCommand *compressor,
+ int nconn G_GNUC_UNUSED,
unsigned int flags,
virDomainAsyncJob asyncJob)
{
diff --git a/src/qemu/qemu_saveimage.h b/src/qemu/qemu_saveimage.h
index 391cd55ed0..b3d5c02fd6 100644
--- a/src/qemu/qemu_saveimage.h
+++ b/src/qemu/qemu_saveimage.h
@@ -96,6 +96,7 @@ qemuSaveImageCreate(virQEMUDriver *driver,
const char *path,
virQEMUSaveData *data,
virCommand *compressor,
+ int nconn,
unsigned int flags,
virDomainAsyncJob asyncJob);
diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c
index b62fab7bb3..2e445e8296 100644
--- a/src/qemu/qemu_snapshot.c
+++ b/src/qemu/qemu_snapshot.c
@@ -1457,7 +1457,7 @@ qemuSnapshotCreateActiveExternal(virQEMUDriver *driver,
memory_existing = virFileExists(snapdef->memorysnapshotfile);
if ((ret = qemuSaveImageCreate(driver, vm, snapdef->memorysnapshotfile,
- data, compressor, 0,
+ data, compressor, -1, 0,
VIR_ASYNC_JOB_SNAPSHOT)) < 0)
goto cleanup;
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 11/20] qemu: add a stub for virDomainRestoreParametersFlags API
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/qemu/qemu_driver.c | 59 ++++++++++++++++++++++++++++++++++++------
1 file changed, 51 insertions(+), 8 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index c341df5f8e..7a4e64a118 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -5811,12 +5811,13 @@ static int qemuNodeGetSecurityModel(virConnectPtr conn,
return 0;
}
-
static int
-qemuDomainRestoreFlags(virConnectPtr conn,
- const char *path,
- const char *dxml,
- unsigned int flags)
+qemuDomainRestoreInternal(virConnectPtr conn,
+ const char *path,
+ const char *dxml,
+ int nchannels G_GNUC_UNUSED,
+ unsigned int flags,
+ int (*ensureACL)(virConnectPtr, virDomainDef *))
{
virQEMUDriver *driver = conn->privateData;
qemuDomainObjPrivate *priv = NULL;
@@ -5834,7 +5835,8 @@ qemuDomainRestoreFlags(virConnectPtr conn,
virCheckFlags(VIR_DOMAIN_SAVE_BYPASS_CACHE |
VIR_DOMAIN_SAVE_RUNNING |
VIR_DOMAIN_SAVE_PAUSED |
- VIR_DOMAIN_SAVE_RESET_NVRAM, -1);
+ VIR_DOMAIN_SAVE_RESET_NVRAM |
+ VIR_DOMAIN_SAVE_PARALLEL, -1);
if (flags & VIR_DOMAIN_SAVE_RESET_NVRAM)
reset_nvram = true;
@@ -5845,7 +5847,7 @@ qemuDomainRestoreFlags(virConnectPtr conn,
if (fd < 0)
goto cleanup;
- if (virDomainRestoreFlagsEnsureACL(conn, def) < 0)
+ if (ensureACL(conn, def) < 0)
goto cleanup;
if (virHookPresent(VIR_HOOK_DRIVER_QEMU)) {
@@ -5913,11 +5915,51 @@ qemuDomainRestoreFlags(virConnectPtr conn,
return ret;
}
+static int
+qemuDomainRestoreFlags(virConnectPtr conn,
+ const char *path,
+ const char *dxml,
+ unsigned int flags)
+{
+ return qemuDomainRestoreInternal(conn, path, dxml, -1, flags,
+ virDomainRestoreFlagsEnsureACL);
+}
+
static int
qemuDomainRestore(virConnectPtr conn,
const char *path)
{
- return qemuDomainRestoreFlags(conn, path, NULL, 0);
+ return qemuDomainRestoreInternal(conn, path, NULL, -1, 0,
+ virDomainRestoreEnsureACL);
+}
+
+static int
+qemuDomainRestoreParametersFlags(virConnectPtr conn,
+ virTypedParameterPtr params, int nparams,
+ unsigned int flags)
+{
+ const char *path = NULL;
+ const char *dxml = NULL;
+ int ret = -1;
+ int nchannels = 2;
+
+ if (virTypedParamsValidate(params, nparams,
+ VIR_SAVE_PARAM_FILE, VIR_TYPED_PARAM_STRING,
+ VIR_SAVE_PARAM_DXML, VIR_TYPED_PARAM_STRING,
+ VIR_SAVE_PARAM_PARALLEL_CONNECTIONS, VIR_TYPED_PARAM_INT,
+ NULL) < 0)
+ return -1;
+
+ if (virTypedParamsGetString(params, nparams, VIR_SAVE_PARAM_FILE, &path) < 0)
+ return -1;
+ if (virTypedParamsGetString(params, nparams, VIR_SAVE_PARAM_DXML, &dxml) < 0)
+ return -1;
+ if (virTypedParamsGetInt(params, nparams, VIR_SAVE_PARAM_PARALLEL_CONNECTIONS,
&nchannels) < 0)
+ return -1;
+
+ ret = qemuDomainRestoreInternal(conn, path, dxml, nchannels, flags,
+ virDomainRestoreParametersFlagsEnsureACL);
+ return ret;
}
static char *
@@ -20884,6 +20926,7 @@ static virHypervisorDriver qemuHypervisorDriver = {
.domainSaveParametersFlags = qemuDomainSaveParametersFlags, /* 8.3.0 */
.domainRestore = qemuDomainRestore, /* 0.2.0 */
.domainRestoreFlags = qemuDomainRestoreFlags, /* 0.9.4 */
+ .domainRestoreParametersFlags = qemuDomainRestoreParametersFlags, /* 8.3.0 */
.domainSaveImageGetXMLDesc = qemuDomainSaveImageGetXMLDesc, /* 0.9.4 */
.domainSaveImageDefineXML = qemuDomainSaveImageDefineXML, /* 0.9.4 */
.domainCoreDump = qemuDomainCoreDump, /* 0.7.0 */
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 12/20] qemu: saveimage: introduce virQEMUSaveFd
use this data type to encapsulate the pathname,
file descriptor, wrapper, and need to unlink.
Adapt qemuSaveImageCreate and qemuSaveImageOpen to use a
virQEMUSaveFd instead of a plain file descriptor.
This makes management of wrapper, need_unlink etc
much easier.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/qemu/qemu_driver.c | 100 +++++++++------
src/qemu/qemu_saveimage.c | 257 +++++++++++++++++++++++---------------
src/qemu/qemu_saveimage.h | 27 +++-
3 files changed, 234 insertions(+), 150 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 7a4e64a118..6851270be3 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -5825,12 +5825,13 @@ qemuDomainRestoreInternal(virConnectPtr conn,
virDomainObj *vm = NULL;
g_autofree char *xmlout = NULL;
const char *newxml = dxml;
- int fd = -1;
int ret = -1;
virQEMUSaveData *data = NULL;
- virFileWrapperFd *wrapperFd = NULL;
+ virQEMUSaveFd saveFd = QEMU_SAVEFD_INVALID;
bool hook_taint = false;
bool reset_nvram = false;
+ g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
+ int oflags = O_RDONLY;
virCheckFlags(VIR_DOMAIN_SAVE_BYPASS_CACHE |
VIR_DOMAIN_SAVE_RUNNING |
@@ -5841,10 +5842,18 @@ qemuDomainRestoreInternal(virConnectPtr conn,
if (flags & VIR_DOMAIN_SAVE_RESET_NVRAM)
reset_nvram = true;
- fd = qemuSaveImageOpen(driver, NULL, path, &def, &data,
- (flags & VIR_DOMAIN_SAVE_BYPASS_CACHE) != 0,
- &wrapperFd, false, false);
- if (fd < 0)
+ if (flags & VIR_DOMAIN_SAVE_BYPASS_CACHE) {
+ if (virFileDirectFdFlag() < 0) {
+ virReportError(VIR_ERR_OPERATION_FAILED, "%s",
+ _("bypass cache unsupported by this system"));
+ return -1;
+ }
+ oflags |= O_DIRECT;
+ }
+ if (virQEMUSaveFdInit(&saveFd, path, 0, oflags, cfg) < 0)
+ return -1;
+
+ if (qemuSaveImageOpen(driver, NULL, &def, &data, false, &saveFd) < 0)
goto cleanup;
if (ensureACL(conn, def) < 0)
@@ -5898,16 +5907,13 @@ qemuDomainRestoreInternal(virConnectPtr conn,
flags) < 0)
goto cleanup;
- ret = qemuSaveImageStartVM(conn, driver, vm, &fd, data, path,
+ ret = qemuSaveImageStartVM(conn, driver, vm, &saveFd.fd, data, path,
false, reset_nvram, VIR_ASYNC_JOB_START);
qemuProcessEndJob(vm);
cleanup:
- VIR_FORCE_CLOSE(fd);
- if (virFileWrapperFdClose(wrapperFd) < 0)
- ret = -1;
- virFileWrapperFdFree(wrapperFd);
+ ret = virQEMUSaveFdFini(&saveFd, vm, ret);
virQEMUSaveDataFree(data);
if (vm && ret < 0)
qemuDomainRemoveInactive(driver, vm);
@@ -5969,15 +5975,16 @@ qemuDomainSaveImageGetXMLDesc(virConnectPtr conn, const char
*path,
virQEMUDriver *driver = conn->privateData;
char *ret = NULL;
g_autoptr(virDomainDef) def = NULL;
- int fd = -1;
virQEMUSaveData *data = NULL;
+ g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
+ virQEMUSaveFd saveFd = QEMU_SAVEFD_INVALID;
virCheckFlags(VIR_DOMAIN_SAVE_IMAGE_XML_SECURE, NULL);
- fd = qemuSaveImageOpen(driver, NULL, path, &def, &data,
- false, NULL, false, false);
+ if (virQEMUSaveFdInit(&saveFd, path, 0, O_RDONLY, cfg) < 0)
+ return NULL;
- if (fd < 0)
+ if (qemuSaveImageOpen(driver, NULL, &def, &data, false, &saveFd) < 0)
goto cleanup;
if (virDomainSaveImageGetXMLDescEnsureACL(conn, def) < 0)
@@ -5987,7 +5994,8 @@ qemuDomainSaveImageGetXMLDesc(virConnectPtr conn, const char *path,
cleanup:
virQEMUSaveDataFree(data);
- VIR_FORCE_CLOSE(fd);
+ if (virQEMUSaveFdFini(&saveFd, NULL, ret ? 0 : -1) < 0)
+ ret = NULL;
return ret;
}
@@ -5999,22 +6007,23 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char
*path,
int ret = -1;
g_autoptr(virDomainDef) def = NULL;
g_autoptr(virDomainDef) newdef = NULL;
- int fd = -1;
virQEMUSaveData *data = NULL;
+ virQEMUSaveFd saveFd = QEMU_SAVEFD_INVALID;
+ g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
int state = -1;
virCheckFlags(VIR_DOMAIN_SAVE_RUNNING |
VIR_DOMAIN_SAVE_PAUSED, -1);
+ if (virQEMUSaveFdInit(&saveFd, path, 0, O_RDWR, cfg) < 0)
+ return -1;
+
if (flags & VIR_DOMAIN_SAVE_RUNNING)
state = 1;
else if (flags & VIR_DOMAIN_SAVE_PAUSED)
state = 0;
- fd = qemuSaveImageOpen(driver, NULL, path, &def, &data,
- false, NULL, true, false);
-
- if (fd < 0)
+ if (qemuSaveImageOpen(driver, NULL, &def, &data, false, &saveFd) < 0)
goto cleanup;
if (virDomainSaveImageDefineXMLEnsureACL(conn, def) < 0)
@@ -6041,15 +6050,15 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char
*path,
VIR_DOMAIN_XML_MIGRATABLE)))
goto cleanup;
- if (lseek(fd, 0, SEEK_SET) != 0) {
+ if (lseek(saveFd.fd, 0, SEEK_SET) != 0) {
virReportSystemError(errno, _("cannot seek in '%s'"), path);
goto cleanup;
}
- if (virQEMUSaveDataWrite(data, fd, path) < 0)
+ if (virQEMUSaveDataWrite(data, saveFd.fd, path) < 0)
goto cleanup;
- if (VIR_CLOSE(fd) < 0) {
+ if (virQEMUSaveFdClose(&saveFd, NULL) < 0) {
virReportSystemError(errno, _("failed to write header data to
'%s'"), path);
goto cleanup;
}
@@ -6057,8 +6066,8 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char *path,
ret = 0;
cleanup:
- VIR_FORCE_CLOSE(fd);
virQEMUSaveDataFree(data);
+ ret = virQEMUSaveFdFini(&saveFd, NULL, ret);
return ret;
}
@@ -6070,8 +6079,9 @@ qemuDomainManagedSaveGetXMLDesc(virDomainPtr dom, unsigned int
flags)
g_autofree char *path = NULL;
char *ret = NULL;
g_autoptr(virDomainDef) def = NULL;
- int fd = -1;
virQEMUSaveData *data = NULL;
+ virQEMUSaveFd saveFd = QEMU_SAVEFD_INVALID;
+ g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
qemuDomainObjPrivate *priv;
virCheckFlags(VIR_DOMAIN_SAVE_IMAGE_XML_SECURE, NULL);
@@ -6093,15 +6103,19 @@ qemuDomainManagedSaveGetXMLDesc(virDomainPtr dom, unsigned int
flags)
goto cleanup;
}
- if ((fd = qemuSaveImageOpen(driver, priv->qemuCaps, path, &def, &data,
- false, NULL, false, false)) < 0)
+ if (virQEMUSaveFdInit(&saveFd, path, 0, O_RDONLY, cfg) < 0)
+ goto cleanup;
+
+ if (qemuSaveImageOpen(driver, priv->qemuCaps, &def, &data, false,
+ &saveFd) < 0)
goto cleanup;
ret = qemuDomainDefFormatXML(driver, priv->qemuCaps, def, flags);
cleanup:
virQEMUSaveDataFree(data);
- VIR_FORCE_CLOSE(fd);
+ if (virQEMUSaveFdFini(&saveFd, vm, ret ? 0 : -1) < 0)
+ ret = NULL;
virDomainObjEndAPI(&vm);
return ret;
}
@@ -6152,16 +6166,25 @@ qemuDomainObjRestore(virConnectPtr conn,
{
g_autoptr(virDomainDef) def = NULL;
qemuDomainObjPrivate *priv = vm->privateData;
- int fd = -1;
int ret = -1;
g_autofree char *xmlout = NULL;
virQEMUSaveData *data = NULL;
- virFileWrapperFd *wrapperFd = NULL;
+ virQEMUSaveFd saveFd = QEMU_SAVEFD_INVALID;
+ int oflags = O_RDONLY;
+ g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
- fd = qemuSaveImageOpen(driver, NULL, path, &def, &data,
- bypass_cache, &wrapperFd, false, true);
- if (fd < 0) {
- if (fd == -3)
+ if (bypass_cache) {
+ if (virFileDirectFdFlag() < 0) {
+ virReportError(VIR_ERR_OPERATION_FAILED, "%s",
+ _("bypass cache unsupported by this system"));
+ return -1;
+ }
+ oflags |= O_DIRECT;
+ }
+
+ ret = qemuSaveImageOpen(driver, NULL, &def, &data, true, &saveFd);
+ if (ret < 0) {
+ if (ret == -3)
ret = 1;
goto cleanup;
}
@@ -6205,15 +6228,12 @@ qemuDomainObjRestore(virConnectPtr conn,
virDomainObjAssignDef(vm, &def, true, NULL);
- ret = qemuSaveImageStartVM(conn, driver, vm, &fd, data, path,
+ ret = qemuSaveImageStartVM(conn, driver, vm, &saveFd.fd, data, path,
start_paused, reset_nvram, asyncJob);
cleanup:
virQEMUSaveDataFree(data);
- VIR_FORCE_CLOSE(fd);
- if (virFileWrapperFdClose(wrapperFd) < 0)
- ret = -1;
- virFileWrapperFdFree(wrapperFd);
+ ret = virQEMUSaveFdFini(&saveFd, vm, ret);
return ret;
}
diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
index 7c76db359e..5a569fa52e 100644
--- a/src/qemu/qemu_saveimage.c
+++ b/src/qemu/qemu_saveimage.c
@@ -248,6 +248,123 @@ qemuSaveImageGetCompressionCommand(virQEMUSaveFormat compression)
return ret;
}
+/*
+ * virQEMUSaveFdInit: initialize a virQEMUSaveFd
+ *
+ * @saveFd: the structure to initialize
+ * @base: the main file name
+ * @idx: 0 for the main file, >0 for multifd channels.
+ * @oflags the file descriptor open flags
+ * @cfg: the driver config
+ *
+ * Returns -1 on error, 0 on success,
+ * and in both cases virQEMUSaveFdFini must be called to free resources.
+ */
+int virQEMUSaveFdInit(virQEMUSaveFd *saveFd, const char *base, int idx,
+ int oflags, virQEMUDriverConfig *cfg)
+{
+ unsigned int wrapperFlags = VIR_FILE_WRAPPER_NON_BLOCKING;
+ bool isCreat = oflags & O_CREAT;
+ bool isDirect = O_DIRECT && (oflags & O_DIRECT);
+
+ if (isDirect)
+ wrapperFlags |= VIR_FILE_WRAPPER_BYPASS_CACHE;
+ if (idx > 0) {
+ saveFd->path = g_strdup_printf("%s.%d", base, idx);
+ } else {
+ saveFd->path = g_strdup(base);
+ }
+ saveFd->wrapper = NULL;
+ if (isCreat) {
+ saveFd->fd = virQEMUFileOpenAs(cfg->user, cfg->group, false,
saveFd->path,
+ oflags, &saveFd->need_unlink);
+ } else {
+ saveFd->fd = qemuDomainOpenFile(cfg, NULL, saveFd->path, oflags, NULL);
+ }
+ if (saveFd->fd < 0)
+ return -1;
+ /*
+ * no wrapper required for the multifd channels.
+ * For O_CREAT, we always add the wrapper for the main file.
+ * For !O_CREAT, we only add the wrapper if using O_DIRECT.
+ */
+ if (idx == 0 && (isDirect || isCreat)) {
+ saveFd->wrapper = virFileWrapperFdNew(&saveFd->fd, saveFd->path,
wrapperFlags);
+ if (!saveFd->wrapper)
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ * virQEMUSaveFdClose: close a virQEMUSaveFd descriptor with normal close.
+ *
+ * @saveFd: the saveFd structure with the file descriptors to close.
+ * @vm: the virDomainObj (necessary to release lock), or NULL.
+ *
+ * If saveFd is NULL, the function will return success.
+ *
+ * Returns -1 on error, 0 on success.
+ */
+int virQEMUSaveFdClose(virQEMUSaveFd *saveFd, virDomainObj *vm)
+{
+ if (!saveFd)
+ return 0;
+
+ if (VIR_CLOSE(saveFd->fd) < 0) {
+ virReportSystemError(errno, _("unable to close %s"), saveFd->path);
+ return -1;
+ }
+ if (vm) {
+ if (qemuDomainFileWrapperFDClose(vm, saveFd->wrapper) < 0)
+ return -1;
+ } else {
+ if (virFileWrapperFdClose(saveFd->wrapper) < 0)
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ * virQEMUSaveFdFini: finalize a virQEMUSaveFd
+ *
+ * @saveFd: the saveFd structure containing the resources to free.
+ * @vm: the virDomainObj (necessary to release lock for long close ops), or NULL.
+ * @ret: the current operation result (< 0 is failure)
+ *
+ * If saveFd is NULL, the return value will be unchanged.
+ *
+ * Returns ret, or -1 if an error is detected.
+ */
+int virQEMUSaveFdFini(virQEMUSaveFd *saveFd, virDomainObj *vm, int ret)
+{
+ if (!saveFd)
+ return ret;
+ VIR_FORCE_CLOSE(saveFd->fd);
+ if (vm) {
+ if (qemuDomainFileWrapperFDClose(vm, saveFd->wrapper) < 0)
+ ret = -1;
+ } else {
+ if (virFileWrapperFdClose(saveFd->wrapper) < 0)
+ ret = -1;
+ }
+
+ if (ret < 0 && saveFd->need_unlink && saveFd->path) {
+ if (unlink(saveFd->path) < 0) {
+ virReportSystemError(errno, _("cannot remove file: %s"),
+ saveFd->path);
+ }
+ }
+ if (saveFd->wrapper) {
+ virFileWrapperFdFree(saveFd->wrapper);
+ saveFd->wrapper = NULL;
+ }
+
+ g_free(saveFd->path);
+ saveFd->path = NULL;
+ return ret;
+}
+
/* Helper function to execute a migration to file with a correct save header
* the caller needs to make sure that the processors are stopped and do all other
@@ -263,41 +380,33 @@ qemuSaveImageCreate(virQEMUDriver *driver,
virDomainAsyncJob asyncJob)
{
g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
- bool needUnlink = false;
+ virQEMUSaveFd saveFd = QEMU_SAVEFD_INVALID;
+ unsigned int oflags = O_WRONLY | O_TRUNC | O_CREAT;
int ret = -1;
- int fd = -1;
- int directFlag = 0;
- virFileWrapperFd *wrapperFd = NULL;
- unsigned int wrapperFlags = VIR_FILE_WRAPPER_NON_BLOCKING;
- /* Obtain the file handle. */
- if ((flags & VIR_DOMAIN_SAVE_BYPASS_CACHE)) {
- wrapperFlags |= VIR_FILE_WRAPPER_BYPASS_CACHE;
- directFlag = virFileDirectFdFlag();
- if (directFlag < 0) {
+ if (flags & VIR_DOMAIN_SAVE_BYPASS_CACHE) {
+ if (virFileDirectFdFlag() < 0) {
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("bypass cache unsupported by this system"));
- goto cleanup;
+ return -1;
}
+ oflags |= O_DIRECT;
}
- fd = virQEMUFileOpenAs(cfg->user, cfg->group, false, path,
- O_WRONLY | O_TRUNC | O_CREAT | directFlag,
- &needUnlink);
- if (fd < 0)
+ if (virQEMUSaveFdInit(&saveFd, path, 0, oflags, cfg) < 0) {
goto cleanup;
-
- if (qemuSecuritySetImageFDLabel(driver->securityManager, vm->def, fd) < 0)
+ }
+ if (qemuSecuritySetImageFDLabel(driver->securityManager, vm->def, saveFd.fd)
< 0)
goto cleanup;
- if (!(wrapperFd = virFileWrapperFdNew(&fd, path, wrapperFlags)))
+ if (virQEMUSaveDataWrite(data, saveFd.fd, saveFd.path) < 0)
goto cleanup;
- if (virQEMUSaveDataWrite(data, fd, path) < 0)
- goto cleanup;
/* Perform the migration */
- if (qemuMigrationSrcToFile(driver, vm, fd, compressor, asyncJob) < 0)
+ if (qemuMigrationSrcToFile(driver, vm, saveFd.fd, compressor, asyncJob) < 0)
+ goto cleanup;
+ if (virQEMUSaveFdClose(&saveFd, vm) < 0)
goto cleanup;
/* Touch up file header to mark image complete. */
@@ -306,29 +415,17 @@ qemuSaveImageCreate(virQEMUDriver *driver,
* up to seek backwards on wrapperFd. The reopened fd will
* trigger a single page of file system cache pollution, but
* that's acceptable. */
- if (VIR_CLOSE(fd) < 0) {
- virReportSystemError(errno, _("unable to close %s"), path);
- goto cleanup;
- }
-
- if (qemuDomainFileWrapperFDClose(vm, wrapperFd) < 0)
- goto cleanup;
- if ((fd = qemuDomainOpenFile(cfg, vm->def, path, O_WRONLY, NULL)) < 0 ||
- virQEMUSaveDataFinish(data, &fd, path) < 0)
+ if ((saveFd.fd = qemuDomainOpenFile(cfg, vm->def, saveFd.path, O_WRONLY, NULL))
< 0 ||
+ virQEMUSaveDataFinish(data, &saveFd.fd, saveFd.path) < 0)
goto cleanup;
ret = 0;
- cleanup:
- VIR_FORCE_CLOSE(fd);
- if (qemuDomainFileWrapperFDClose(vm, wrapperFd) < 0)
- ret = -1;
- virFileWrapperFdFree(wrapperFd);
- if (ret < 0 && needUnlink)
- unlink(path);
+ cleanup:
+ ret = virQEMUSaveFdFini(&saveFd, vm, ret);
return ret;
}
@@ -421,94 +518,49 @@ qemuSaveImageGetCompressionProgram(const char *imageFormat,
* @path: path of the save image
* @ret_def: returns domain definition created from the XML stored in the image
* @ret_data: returns structure filled with data from the image header
- * @bypass_cache: bypass cache when opening the file
- * @wrapperFd: returns the file wrapper structure
- * @open_write: open the file for writing (for updates)
- * @unlink_corrupt: remove the image file if it is corrupted
+ * @unlink_corrupt: mark the image file for removal if it is corrupted
+ * @saveFd: the save file
*
- * Returns the opened fd of the save image file and fills the appropriate fields
- * on success. On error returns -1 on most failures, -3 if corrupt image was
- * unlinked (no error raised).
+ * Returns 0 on success or -1 on failure.
+ * On success, the appropriate fields are filled.
*/
int
qemuSaveImageOpen(virQEMUDriver *driver,
virQEMUCaps *qemuCaps,
- const char *path,
virDomainDef **ret_def,
virQEMUSaveData **ret_data,
- bool bypass_cache,
- virFileWrapperFd **wrapperFd,
- bool open_write,
- bool unlink_corrupt)
+ bool unlink_corrupt,
+ virQEMUSaveFd *saveFd)
{
- g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
- VIR_AUTOCLOSE fd = -1;
- int ret = -1;
g_autoptr(virQEMUSaveData) data = NULL;
virQEMUSaveHeader *header;
g_autoptr(virDomainDef) def = NULL;
- int oflags = open_write ? O_RDWR : O_RDONLY;
size_t xml_len;
size_t cookie_len;
- if (bypass_cache) {
- int directFlag = virFileDirectFdFlag();
- if (directFlag < 0) {
- virReportError(VIR_ERR_OPERATION_FAILED, "%s",
- _("bypass cache unsupported by this system"));
- return -1;
- }
- oflags |= directFlag;
- }
-
- if ((fd = qemuDomainOpenFile(cfg, NULL, path, oflags, NULL)) < 0)
- return -1;
-
- if (bypass_cache &&
- !(*wrapperFd = virFileWrapperFdNew(&fd, path,
- VIR_FILE_WRAPPER_BYPASS_CACHE)))
- return -1;
data = g_new0(virQEMUSaveData, 1);
header = &data->header;
- if (saferead(fd, header, sizeof(*header)) != sizeof(*header)) {
- if (unlink_corrupt) {
- if (unlink(path) < 0) {
- virReportSystemError(errno,
- _("cannot remove corrupt file: %s"),
- path);
- return -1;
- } else {
- return -3;
- }
- }
-
+ if (saferead(saveFd->fd, header, sizeof(*header)) != sizeof(*header)) {
virReportError(VIR_ERR_OPERATION_FAILED,
"%s", _("failed to read qemu header"));
+ if (unlink_corrupt) {
+ saveFd->need_unlink = true;
+ }
return -1;
}
if (memcmp(header->magic, QEMU_SAVE_MAGIC, sizeof(header->magic)) != 0) {
- if (memcmp(header->magic, QEMU_SAVE_PARTIAL, sizeof(header->magic)) == 0)
{
- if (unlink_corrupt) {
- if (unlink(path) < 0) {
- virReportSystemError(errno,
- _("cannot remove corrupt file: %s"),
- path);
- return -1;
- } else {
- return -3;
- }
- }
-
+ if (memcmp(header->magic, QEMU_SAVE_PARTIAL, sizeof(header->magic)) == 0)
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("save image is incomplete"));
- return -1;
+ else
+ virReportError(VIR_ERR_OPERATION_FAILED, "%s",
+ _("image magic is incorrect"));
+ if (unlink_corrupt) {
+ saveFd->need_unlink = true;
}
-
- virReportError(VIR_ERR_OPERATION_FAILED, "%s",
- _("image magic is incorrect"));
return -1;
}
@@ -539,7 +591,7 @@ qemuSaveImageOpen(virQEMUDriver *driver,
data->xml = g_new0(char, xml_len);
- if (saferead(fd, data->xml, xml_len) != xml_len) {
+ if (saferead(saveFd->fd, data->xml, xml_len) != xml_len) {
virReportError(VIR_ERR_OPERATION_FAILED,
"%s", _("failed to read domain XML"));
return -1;
@@ -548,7 +600,7 @@ qemuSaveImageOpen(virQEMUDriver *driver,
if (cookie_len > 0) {
data->cookie = g_new0(char, cookie_len);
- if (saferead(fd, data->cookie, cookie_len) != cookie_len) {
+ if (saferead(saveFd->fd, data->cookie, cookie_len) != cookie_len) {
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("failed to read cookie"));
return -1;
@@ -564,10 +616,7 @@ qemuSaveImageOpen(virQEMUDriver *driver,
*ret_def = g_steal_pointer(&def);
*ret_data = g_steal_pointer(&data);
- ret = fd;
- fd = -1;
-
- return ret;
+ return 0;
}
int
diff --git a/src/qemu/qemu_saveimage.h b/src/qemu/qemu_saveimage.h
index b3d5c02fd6..5dc63f3661 100644
--- a/src/qemu/qemu_saveimage.h
+++ b/src/qemu/qemu_saveimage.h
@@ -54,6 +54,24 @@ struct _virQEMUSaveData {
};
+typedef struct _virQEMUSaveFd virQEMUSaveFd;
+struct _virQEMUSaveFd {
+ char *path;
+ int fd;
+ bool need_unlink;
+ virFileWrapperFd *wrapper;
+};
+
+#define QEMU_SAVEFD_INVALID (virQEMUSaveFd) { .path = NULL, .fd = -1, .need_unlink =
false, .wrapper = NULL }
+
+int virQEMUSaveFdInit(virQEMUSaveFd *saveFd, const char *base, int idx,
+ int oflags, virQEMUDriverConfig *cfg)
+ ATTRIBUTE_NONNULL(5);
+
+int virQEMUSaveFdClose(virQEMUSaveFd *saveFd, virDomainObj *vm);
+
+int virQEMUSaveFdFini(virQEMUSaveFd *saveFd, virDomainObj *vm, int ret);
+
virDomainDef *
qemuSaveImageUpdateDef(virQEMUDriver *driver,
virDomainDef *def,
@@ -74,14 +92,11 @@ qemuSaveImageStartVM(virConnectPtr conn,
int
qemuSaveImageOpen(virQEMUDriver *driver,
virQEMUCaps *qemuCaps,
- const char *path,
virDomainDef **ret_def,
virQEMUSaveData **ret_data,
- bool bypass_cache,
- virFileWrapperFd **wrapperFd,
- bool open_write,
- bool unlink_corrupt)
- ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4);
+ bool unlink_corrupt,
+ virQEMUSaveFd *saveFd)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(6);
int
qemuSaveImageGetCompressionProgram(const char *imageFormat,
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 13/20] qemu: wire up saveimage code with the multifd helper
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/qemu/qemu_saveimage.c | 130 ++++++++++++++++++++++++++++++++++++--
src/qemu/qemu_saveimage.h | 11 ++++
2 files changed, 137 insertions(+), 4 deletions(-)
diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
index 5a569fa52e..65d9a3fef5 100644
--- a/src/qemu/qemu_saveimage.c
+++ b/src/qemu/qemu_saveimage.c
@@ -17,6 +17,7 @@
*/
#include <config.h>
+#include <configmake.h>
#include "qemu_saveimage.h"
#include "qemu_domain.h"
@@ -365,6 +366,93 @@ int virQEMUSaveFdFini(virQEMUSaveFd *saveFd, virDomainObj *vm, int
ret)
return ret;
}
+/*
+ * qemuSaveImageFreeMultiFd: free all multifd virQEMUSaveFds.
+ * @multiFd: the array of saveFds
+ * @vm: the virDomainObj, to release lock
+ * @nconn: number of multifd channels
+ * @ret: the current operation result (< 0 is failure)
+ *
+ * If multiFd is NULL, the return value will be unchanged.
+ *
+ * Returns ret, or -1 if an error is detected.
+ */
+int qemuSaveImageFreeMultiFd(virQEMUSaveFd *multiFd, virDomainObj *vm, int nconn, int
ret)
+{
+ int idx;
+
+ if (!multiFd)
+ return ret;
+
+ for (idx = 0; idx < nconn; idx++) {
+ ret = virQEMUSaveFdFini(&multiFd[idx], vm, ret);
+ }
+ /*
+ * do it again to unlink all in the error case,
+ * if error happened in the middle of previous loop.
+ */
+ for (idx = 0; idx < nconn; idx++) {
+ ret = virQEMUSaveFdFini(&multiFd[idx], vm, ret);
+ }
+ g_free(multiFd);
+ return ret;
+}
+
+/*
+ * qemuSaveImageCloseMultiFd: perform normal close on all multifd virQEMUSaveFds.
+ * If multiFd is NULL, the function will return success.
+ *
+ * Returns -1 on error, 0 on success.
+ */
+
+int qemuSaveImageCloseMultiFd(virQEMUSaveFd *multiFd, int nconn, virDomainObj *vm)
+{
+ int idx;
+
+ if (!multiFd)
+ return 0;
+
+ for (idx = 0; idx < nconn; idx++) {
+ if (virQEMUSaveFdClose(&multiFd[idx], vm) < 0) {
+ return -1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * qemuSaveImageCreateMultiFd: allocate and initialize all multifd virQEMUSaveFds.
+ *
+ * Returns the new array of virQEMUSaveFds, or NULL on error.
+ */
+
+virQEMUSaveFd *
+qemuSaveImageCreateMultiFd(virQEMUDriver *driver, virDomainObj *vm,
+ virCommand *cmd, const char *path,
+ int oflags, virQEMUDriverConfig *cfg,
+ int nconn)
+{
+ virQEMUSaveFd *multiFd = g_new0(virQEMUSaveFd, nconn);
+ int idx;
+
+ for (idx = 0; idx < nconn; idx++) {
+ virQEMUSaveFd *m = &multiFd[idx];
+ if (virQEMUSaveFdInit(m, path, idx + 1, oflags, cfg) < 0 ||
+ qemuSecuritySetImageFDLabel(driver->securityManager, vm->def, m->fd)
< 0) {
+
+ virQEMUSaveFdFini(m, vm, -1);
+ goto error;
+ }
+ virCommandAddArgFormat(cmd, "%d", m->fd);
+ virCommandPassFD(cmd, m->fd, 0);
+ }
+ return multiFd;
+
+ error:
+ qemuSaveImageFreeMultiFd(multiFd, vm, nconn, -1);
+ return NULL;
+}
+
/* Helper function to execute a migration to file with a correct save header
* the caller needs to make sure that the processors are stopped and do all other
@@ -381,6 +469,7 @@ qemuSaveImageCreate(virQEMUDriver *driver,
{
g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
virQEMUSaveFd saveFd = QEMU_SAVEFD_INVALID;
+ virQEMUSaveFd *multiFd = NULL;
unsigned int oflags = O_WRONLY | O_TRUNC | O_CREAT;
int ret = -1;
@@ -402,10 +491,43 @@ qemuSaveImageCreate(virQEMUDriver *driver,
if (virQEMUSaveDataWrite(data, saveFd.fd, saveFd.path) < 0)
goto cleanup;
+ if (flags & VIR_DOMAIN_SAVE_PARALLEL) {
+ g_autoptr(virCommand) cmd = NULL;
+ g_autofree char *helper_path = NULL;
+ qemuDomainObjPrivate *priv = vm->privateData;
+ g_autofree char *sun_path = g_strdup_printf("%s/save-multifd.sock",
priv->libDir);
+ char buf[1];
+ int helper_out = -1;
+ if (!(helper_path = virFileFindResource("libvirt_multifd_helper",
+ abs_top_builddir "/src",
+ LIBEXECDIR)))
+ goto cleanup;
+ cmd = virCommandNewArgList(helper_path, sun_path, NULL);
+ virCommandAddArgFormat(cmd, "%d", nconn);
+ virCommandAddArgFormat(cmd, "%d", saveFd.fd);
+ virCommandPassFD(cmd, saveFd.fd, 0);
+ virCommandSetOutputFD(cmd, &helper_out); /* should create pipe automagically
*/
+
+ /* Perform parallel multifd migration to files (main fd + channels) */
+ if (!(multiFd = qemuSaveImageCreateMultiFd(driver, vm, cmd, saveFd.path, oflags,
cfg, nconn)))
+ goto cleanup;
+ if (virCommandRunAsync(cmd, NULL) < 0)
+ goto cleanup;
+ if (saferead(helper_out, &buf, 1) != 1 || buf[0] != 'R')
+ goto cleanup;
+ if (chown(sun_path, cfg->user, cfg->group) < 0)
+ goto cleanup;
+ /* still using single fd migration for now */
+ if (qemuMigrationSrcToFile(driver, vm, saveFd.fd, compressor, asyncJob) < 0)
+ goto cleanup;
+ if (qemuSaveImageCloseMultiFd(multiFd, nconn, vm) < 0)
+ goto cleanup;
+ } else {
+ /* Perform non-parallel migration to file */
+ if (qemuMigrationSrcToFile(driver, vm, saveFd.fd, compressor, asyncJob) < 0)
+ goto cleanup;
+ }
- /* Perform the migration */
- if (qemuMigrationSrcToFile(driver, vm, saveFd.fd, compressor, asyncJob) < 0)
- goto cleanup;
if (virQEMUSaveFdClose(&saveFd, vm) < 0)
goto cleanup;
@@ -424,7 +546,7 @@ qemuSaveImageCreate(virQEMUDriver *driver,
cleanup:
-
+ ret = qemuSaveImageFreeMultiFd(multiFd, vm, nconn, ret);
ret = virQEMUSaveFdFini(&saveFd, vm, ret);
return ret;
}
diff --git a/src/qemu/qemu_saveimage.h b/src/qemu/qemu_saveimage.h
index 5dc63f3661..b775c5eb08 100644
--- a/src/qemu/qemu_saveimage.h
+++ b/src/qemu/qemu_saveimage.h
@@ -72,6 +72,17 @@ int virQEMUSaveFdClose(virQEMUSaveFd *saveFd, virDomainObj *vm);
int virQEMUSaveFdFini(virQEMUSaveFd *saveFd, virDomainObj *vm, int ret);
+virQEMUSaveFd *
+qemuSaveImageCreateMultiFd(virQEMUDriver *driver, virDomainObj *vm,
+ virCommand *cmd, const char *path,
+ int oflags, virQEMUDriverConfig *cfg,
+ int nconn)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4)
ATTRIBUTE_NONNULL(6);
+
+int qemuSaveImageCloseMultiFd(virQEMUSaveFd *multiFd, int nconn, virDomainObj *vm);
+
+int qemuSaveImageFreeMultiFd(virQEMUSaveFd *multiFd, virDomainObj *vm, int nconn, int
ret);
+
virDomainDef *
qemuSaveImageUpdateDef(virQEMUDriver *driver,
virDomainDef *def,
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 14/20] qemu: capabilities: add multifd to the probed migration capabilities
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/qemu/qemu_capabilities.c | 4 ++++
src/qemu/qemu_capabilities.h | 3 +++
tests/qemucapabilitiesdata/caps_4.0.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.0.0.ppc64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.0.0.riscv32.xml | 1 +
tests/qemucapabilitiesdata/caps_4.0.0.riscv64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.0.0.s390x.xml | 1 +
tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.ppc64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.1.0.sparc.xml | 1 +
tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.2.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.2.0.ppc64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.2.0.riscv64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.2.0.s390x.xml | 1 +
tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_6.0.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_6.0.0.s390x.xml | 1 +
tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_6.2.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_6.2.0.ppc64.xml | 1 +
tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_7.0.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_7.0.0.ppc64.xml | 1 +
tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml | 1 +
34 files changed, 39 insertions(+)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index b91db851bb..1aba26a86a 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -672,6 +672,9 @@ VIR_ENUM_IMPL(virQEMUCaps,
"virtio-iommu-pci", /* QEMU_CAPS_DEVICE_VIRTIO_IOMMU_PCI */
"virtio-iommu.boot-bypass", /* QEMU_CAPS_VIRTIO_IOMMU_BOOT_BYPASS
*/
"virtio-net.rss", /* QEMU_CAPS_VIRTIO_NET_RSS */
+
+ /* 430 */
+ "migrate-multifd", /* QEMU_CAPS_MIGRATE_MULTIFD */
);
@@ -1230,6 +1233,7 @@ struct virQEMUCapsStringFlags virQEMUCapsCommands[] = {
struct virQEMUCapsStringFlags virQEMUCapsMigration[] = {
{ "rdma-pin-all", QEMU_CAPS_MIGRATE_RDMA },
+ { "multifd", QEMU_CAPS_MIGRATE_MULTIFD },
};
/* Use virQEMUCapsQMPSchemaQueries for querying parameters of events */
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 9b240e47fb..b089f83da1 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -648,6 +648,9 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check
*/
QEMU_CAPS_VIRTIO_IOMMU_BOOT_BYPASS, /* virtio-iommu.boot-bypass */
QEMU_CAPS_VIRTIO_NET_RSS, /* virtio-net rss feature */
+ /* 430 */
+ QEMU_CAPS_MIGRATE_MULTIFD, /* migrate can set multifd parameter */
+
QEMU_CAPS_LAST /* this must always be the last item */
} virQEMUCapsFlags;
diff --git a/tests/qemucapabilitiesdata/caps_4.0.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_4.0.0.aarch64.xml
index 5adf904fc4..4ca2cfa81c 100644
--- a/tests/qemucapabilitiesdata/caps_4.0.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.0.0.aarch64.xml
@@ -148,6 +148,7 @@
<flag name='input-linux'/>
<flag name='query-display-options'/>
<flag name='virtio-blk.queue-size'/>
+ <flag name='migrate-multifd'/>
<version>4000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700240</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.0.0.ppc64.xml
b/tests/qemucapabilitiesdata/caps_4.0.0.ppc64.xml
index a84adc2610..1db978eb4c 100644
--- a/tests/qemucapabilitiesdata/caps_4.0.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.0.0.ppc64.xml
@@ -153,6 +153,7 @@
<flag name='input-linux'/>
<flag name='query-display-options'/>
<flag name='virtio-blk.queue-size'/>
+ <flag name='migrate-multifd'/>
<version>4000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900240</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.0.0.riscv32.xml
b/tests/qemucapabilitiesdata/caps_4.0.0.riscv32.xml
index c494254c4d..251d4dfd29 100644
--- a/tests/qemucapabilitiesdata/caps_4.0.0.riscv32.xml
+++ b/tests/qemucapabilitiesdata/caps_4.0.0.riscv32.xml
@@ -145,6 +145,7 @@
<flag name='input-linux'/>
<flag name='query-display-options'/>
<flag name='virtio-blk.queue-size'/>
+ <flag name='migrate-multifd'/>
<version>4000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>0</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.0.0.riscv64.xml
b/tests/qemucapabilitiesdata/caps_4.0.0.riscv64.xml
index d2582fa297..a4af47c6a4 100644
--- a/tests/qemucapabilitiesdata/caps_4.0.0.riscv64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.0.0.riscv64.xml
@@ -145,6 +145,7 @@
<flag name='input-linux'/>
<flag name='query-display-options'/>
<flag name='virtio-blk.queue-size'/>
+ <flag name='migrate-multifd'/>
<version>4000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>0</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.0.0.s390x.xml
b/tests/qemucapabilitiesdata/caps_4.0.0.s390x.xml
index 4f36186044..2bab764867 100644
--- a/tests/qemucapabilitiesdata/caps_4.0.0.s390x.xml
+++ b/tests/qemucapabilitiesdata/caps_4.0.0.s390x.xml
@@ -115,6 +115,7 @@
<flag name='input-linux'/>
<flag name='query-display-options'/>
<flag name='virtio-blk.queue-size'/>
+ <flag name='migrate-multifd'/>
<version>4000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>39100240</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml
index 18e5ebd4f4..aa8a9812e5 100644
--- a/tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml
@@ -188,6 +188,7 @@
<flag name='input-linux'/>
<flag name='query-display-options'/>
<flag name='virtio-blk.queue-size'/>
+ <flag name='migrate-multifd'/>
<version>4000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100240</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
index 12c5ebe6f3..bd89f0c6b2 100644
--- a/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
@@ -195,6 +195,7 @@
<flag name='input-linux'/>
<flag name='query-display-options'/>
<flag name='virtio-blk.queue-size'/>
+ <flag name='migrate-multifd'/>
<version>4001000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
index ee536b7b63..369ef707b9 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
@@ -163,6 +163,7 @@
<flag name='input-linux'/>
<flag name='query-display-options'/>
<flag name='virtio-blk.queue-size'/>
+ <flag name='migrate-multifd'/>
<version>4001050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.ppc64.xml
b/tests/qemucapabilitiesdata/caps_4.2.0.ppc64.xml
index 10f5a9e2c5..16c867a46b 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.ppc64.xml
@@ -160,6 +160,7 @@
<flag name='input-linux'/>
<flag name='query-display-options'/>
<flag name='virtio-blk.queue-size'/>
+ <flag name='migrate-multifd'/>
<version>4001050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
b/tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
index 069777a49b..b584ba7352 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
@@ -128,6 +128,7 @@
<flag name='input-linux'/>
<flag name='query-display-options'/>
<flag name='virtio-blk.queue-size'/>
+ <flag name='migrate-multifd'/>
<version>4002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>39100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
index 6b61214a0b..5023028678 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
@@ -206,6 +206,7 @@
<flag name='input-linux'/>
<flag name='query-display-options'/>
<flag name='virtio-blk.queue-size'/>
+ <flag name='migrate-multifd'/>
<version>4002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
index 4fd02e786d..c45b2e6cf6 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
@@ -175,6 +175,7 @@
<flag name='virtio-blk.queue-size'/>
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
+ <flag name='migrate-multifd'/>
<version>5000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
index f2f3558fdc..a3ad743d70 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
@@ -181,6 +181,7 @@
<flag name='virtio-blk.queue-size'/>
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
+ <flag name='migrate-multifd'/>
<version>5000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml
index 557949d6d6..e1b5cac26b 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml
@@ -167,6 +167,7 @@
<flag name='virtio-blk.queue-size'/>
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
+ <flag name='migrate-multifd'/>
<version>5000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>0</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
index f301d8a926..796adb9066 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
@@ -215,6 +215,7 @@
<flag name='virtio-blk.queue-size'/>
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
+ <flag name='migrate-multifd'/>
<version>5000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.1.0.sparc.xml
b/tests/qemucapabilitiesdata/caps_5.1.0.sparc.xml
index 3a330ebdc0..cb203df125 100644
--- a/tests/qemucapabilitiesdata/caps_5.1.0.sparc.xml
+++ b/tests/qemucapabilitiesdata/caps_5.1.0.sparc.xml
@@ -87,6 +87,7 @@
<flag name='input-linux'/>
<flag name='query-display-options'/>
<flag name='memory-backend-file.prealloc-threads'/>
+ <flag name='migrate-multifd'/>
<version>5001000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>0</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
index 53fcbf3417..7479d942a2 100644
--- a/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
@@ -219,6 +219,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>5001000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_5.2.0.aarch64.xml
index 824224302c..268d1444ad 100644
--- a/tests/qemucapabilitiesdata/caps_5.2.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.2.0.aarch64.xml
@@ -182,6 +182,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>5002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.ppc64.xml
b/tests/qemucapabilitiesdata/caps_5.2.0.ppc64.xml
index b949f88b5a..eabf4b600c 100644
--- a/tests/qemucapabilitiesdata/caps_5.2.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.2.0.ppc64.xml
@@ -186,6 +186,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>5002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.riscv64.xml
b/tests/qemucapabilitiesdata/caps_5.2.0.riscv64.xml
index 873923992d..0dbaf5a5ec 100644
--- a/tests/qemucapabilitiesdata/caps_5.2.0.riscv64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.2.0.riscv64.xml
@@ -172,6 +172,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>5002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>0</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.s390x.xml
b/tests/qemucapabilitiesdata/caps_5.2.0.s390x.xml
index 5e9560d7b7..b0fbab9cb5 100644
--- a/tests/qemucapabilitiesdata/caps_5.2.0.s390x.xml
+++ b/tests/qemucapabilitiesdata/caps_5.2.0.s390x.xml
@@ -140,6 +140,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>5002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>39100243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
index 3998da9253..1a1717bf2a 100644
--- a/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
@@ -223,6 +223,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>5002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.0.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_6.0.0.aarch64.xml
index 51d3628eeb..1c18d122e2 100644
--- a/tests/qemucapabilitiesdata/caps_6.0.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.0.0.aarch64.xml
@@ -190,6 +190,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>6000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.0.0.s390x.xml
b/tests/qemucapabilitiesdata/caps_6.0.0.s390x.xml
index 2e5d0f197a..8fa4cb2307 100644
--- a/tests/qemucapabilitiesdata/caps_6.0.0.s390x.xml
+++ b/tests/qemucapabilitiesdata/caps_6.0.0.s390x.xml
@@ -148,6 +148,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>6000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>39100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
index 3498d6255b..70c67202b1 100644
--- a/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
@@ -232,6 +232,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>6000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
index ddeca62290..a5ec77878f 100644
--- a/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
@@ -236,6 +236,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>6001000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.2.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_6.2.0.aarch64.xml
index 5538940372..92d8ceff7e 100644
--- a/tests/qemucapabilitiesdata/caps_6.2.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.2.0.aarch64.xml
@@ -201,6 +201,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>6001050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700244</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.2.0.ppc64.xml
b/tests/qemucapabilitiesdata/caps_6.2.0.ppc64.xml
index 9c9d9aa08e..f219912927 100644
--- a/tests/qemucapabilitiesdata/caps_6.2.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.2.0.ppc64.xml
@@ -197,6 +197,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>6002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900244</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml
index dba5ecaf87..38fd3878ea 100644
--- a/tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml
@@ -238,6 +238,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>6002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100244</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_7.0.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_7.0.0.aarch64.xml
index 257b0f625d..522e225c8f 100644
--- a/tests/qemucapabilitiesdata/caps_7.0.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_7.0.0.aarch64.xml
@@ -209,6 +209,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-iommu.boot-bypass'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>6002092</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_7.0.0.ppc64.xml
b/tests/qemucapabilitiesdata/caps_7.0.0.ppc64.xml
index 1ddca7d767..1eb43799c0 100644
--- a/tests/qemucapabilitiesdata/caps_7.0.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_7.0.0.ppc64.xml
@@ -210,6 +210,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-iommu.boot-bypass'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>6002092</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml
index 87f9b4068d..82f623883a 100644
--- a/tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml
@@ -242,6 +242,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-iommu.boot-bypass'/>
<flag name='virtio-net.rss'/>
+ <flag name='migrate-multifd'/>
<version>6002092</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100243</microcodeVersion>
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 15/20] qemu: implement qemuMigrationSrcToFilesMultiFd
implement a function similar to qemuMigrationSrcToFile
that migrates to multiple files using QEMU multifd.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/qemu/qemu_migration.c | 129 ++++++++++++++++++++-----------
src/qemu/qemu_migration.h | 7 ++
src/qemu/qemu_migration_params.c | 22 ++++++
src/qemu/qemu_migration_params.h | 9 +++
src/qemu/qemu_saveimage.c | 5 +-
5 files changed, 124 insertions(+), 48 deletions(-)
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index b735bdb391..371db6a41c 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -5896,13 +5896,14 @@ qemuMigrationDstFinish(virQEMUDriver *driver,
return dom;
}
-
/* Helper function called while vm is active. */
-int
-qemuMigrationSrcToFile(virQEMUDriver *driver, virDomainObj *vm,
- int fd,
- virCommand *compressor,
- virDomainAsyncJob asyncJob)
+static int
+qemuMigrationSrcToFileAux(virQEMUDriver *driver, virDomainObj *vm,
+ int fd,
+ virCommand *compressor,
+ virDomainAsyncJob asyncJob,
+ const char *sun_path,
+ int nchannels)
{
qemuDomainObjPrivate *priv = vm->privateData;
bool bwParam = virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATION_PARAM_BANDWIDTH);
@@ -5913,24 +5914,24 @@ qemuMigrationSrcToFile(virQEMUDriver *driver, virDomainObj *vm,
char *errbuf = NULL;
virErrorPtr orig_err = NULL;
g_autoptr(qemuMigrationParams) migParams = NULL;
+ bool needParams = (bwParam || sun_path);
if (qemuMigrationSetDBusVMState(driver, vm) < 0)
return -1;
+ if (sun_path && !virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATE_MULTIFD))
+ return -1;
+
/* Increase migration bandwidth to unlimited since target is a file.
* Failure to change migration speed is not fatal. */
- if (bwParam) {
- if (!(migParams = qemuMigrationParamsNew()))
- return -1;
+ if (needParams && !((migParams = qemuMigrationParamsNew())))
+ return -1;
+ if (bwParam) {
if (qemuMigrationParamsSetULL(migParams,
QEMU_MIGRATION_PARAM_MAX_BANDWIDTH,
QEMU_DOMAIN_MIG_BANDWIDTH_MAX * 1024 * 1024) <
0)
return -1;
-
- if (qemuMigrationParamsApply(driver, vm, asyncJob, migParams) < 0)
- return -1;
-
priv->migMaxBandwidth = QEMU_DOMAIN_MIG_BANDWIDTH_MAX;
} else {
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) == 0) {
@@ -5941,6 +5942,17 @@ qemuMigrationSrcToFile(virQEMUDriver *driver, virDomainObj *vm,
}
}
+ if (sun_path) {
+ qemuMigrationParamsSetCap(migParams, QEMU_MIGRATION_CAP_MULTIFD);
+ if (qemuMigrationParamsSetInt(migParams,
+ QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
+ nchannels) < 0)
+ return -1;
+ }
+
+ if (needParams && qemuMigrationParamsApply(driver, vm, asyncJob, migParams)
< 0)
+ return -1;
+
if (!virDomainObjIsActive(vm)) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("guest unexpectedly quit"));
@@ -5948,45 +5960,53 @@ qemuMigrationSrcToFile(virQEMUDriver *driver, virDomainObj *vm,
return -1;
}
- if (compressor && virPipe(pipeFD) < 0)
+ if (!sun_path && compressor && virPipe(pipeFD) < 0)
return -1;
- /* All right! We can use fd migration, which means that qemu
- * doesn't have to open() the file, so while we still have to
- * grant SELinux access, we can do it on fd and avoid cleanup
- * later, as well as skip futzing with cgroup. */
- if (qemuSecuritySetImageFDLabel(driver->securityManager, vm->def,
- compressor ? pipeFD[1] : fd) < 0)
- goto cleanup;
-
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
goto cleanup;
- if (!compressor) {
- rc = qemuMonitorMigrateToFd(priv->mon,
- QEMU_MONITOR_MIGRATE_BACKGROUND,
- fd);
+ if (sun_path) {
+ rc = qemuMonitorMigrateToSocket(priv->mon,
+ QEMU_MONITOR_MIGRATE_BACKGROUND,
+ sun_path);
} else {
- virCommandSetInputFD(compressor, pipeFD[0]);
- virCommandSetOutputFD(compressor, &fd);
- virCommandSetErrorBuffer(compressor, &errbuf);
- virCommandDoAsyncIO(compressor);
- if (virSetCloseExec(pipeFD[1]) < 0) {
- virReportSystemError(errno, "%s",
- _("Unable to set cloexec flag"));
- qemuDomainObjExitMonitor(vm);
- goto cleanup;
- }
- if (virCommandRunAsync(compressor, NULL) < 0) {
- qemuDomainObjExitMonitor(vm);
+ /*
+ * All right! We can use fd migration, which means that qemu
+ * doesn't have to open() the file, so while we still have to
+ * grant SELinux access, we can do it on fd and avoid cleanup
+ * later, as well as skip futzing with cgroup.
+ */
+ if (qemuSecuritySetImageFDLabel(driver->securityManager, vm->def,
+ compressor ? pipeFD[1] : fd) < 0)
goto cleanup;
+
+ if (!compressor) {
+ rc = qemuMonitorMigrateToFd(priv->mon,
+ QEMU_MONITOR_MIGRATE_BACKGROUND,
+ fd);
+ } else {
+ virCommandSetInputFD(compressor, pipeFD[0]);
+ virCommandSetOutputFD(compressor, &fd);
+ virCommandSetErrorBuffer(compressor, &errbuf);
+ virCommandDoAsyncIO(compressor);
+ if (virSetCloseExec(pipeFD[1]) < 0) {
+ virReportSystemError(errno, "%s",
+ _("Unable to set cloexec flag"));
+ qemuDomainObjExitMonitor(vm);
+ goto cleanup;
+ }
+ if (virCommandRunAsync(compressor, NULL) < 0) {
+ qemuDomainObjExitMonitor(vm);
+ goto cleanup;
+ }
+ rc = qemuMonitorMigrateToFd(priv->mon,
+ QEMU_MONITOR_MIGRATE_BACKGROUND,
+ pipeFD[1]);
+ if (VIR_CLOSE(pipeFD[0]) < 0 ||
+ VIR_CLOSE(pipeFD[1]) < 0)
+ VIR_WARN("failed to close intermediate pipe");
}
- rc = qemuMonitorMigrateToFd(priv->mon,
- QEMU_MONITOR_MIGRATE_BACKGROUND,
- pipeFD[1]);
- if (VIR_CLOSE(pipeFD[0]) < 0 ||
- VIR_CLOSE(pipeFD[1]) < 0)
- VIR_WARN("failed to close intermediate pipe");
}
qemuDomainObjExitMonitor(vm);
if (rc < 0)
@@ -6007,7 +6027,7 @@ qemuMigrationSrcToFile(virQEMUDriver *driver, virDomainObj *vm,
goto cleanup;
}
- if (compressor && virCommandWait(compressor, NULL) < 0)
+ if (!sun_path && compressor && virCommandWait(compressor, NULL) <
0)
goto cleanup;
qemuDomainEventEmitJobCompleted(driver, vm);
@@ -6046,6 +6066,25 @@ qemuMigrationSrcToFile(virQEMUDriver *driver, virDomainObj *vm,
return ret;
}
+int
+qemuMigrationSrcToFile(virQEMUDriver *driver, virDomainObj *vm,
+ int fd,
+ virCommand *compressor,
+ virDomainAsyncJob asyncJob)
+{
+ return qemuMigrationSrcToFileAux(driver, vm, fd, compressor,
+ asyncJob, NULL, -1);
+}
+
+int
+qemuMigrationSrcToFilesMultiFd(virQEMUDriver *driver, virDomainObj *vm,
+ virDomainAsyncJob asyncJob,
+ const char *sun_path,
+ int nchannels)
+{
+ return qemuMigrationSrcToFileAux(driver, vm, -1, NULL,
+ asyncJob, sun_path, nchannels);
+}
int
qemuMigrationSrcCancel(virQEMUDriver *driver,
diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h
index a8afa66119..ddc8e65489 100644
--- a/src/qemu/qemu_migration.h
+++ b/src/qemu/qemu_migration.h
@@ -213,6 +213,13 @@ qemuMigrationSrcToFile(virQEMUDriver *driver,
virDomainAsyncJob asyncJob)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT;
+int
+qemuMigrationSrcToFilesMultiFd(virQEMUDriver *driver, virDomainObj *vm,
+ virDomainAsyncJob asyncJob,
+ const char *sun_path,
+ int nchannels)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT;
+
int
qemuMigrationSrcCancel(virQEMUDriver *driver,
virDomainObj *vm);
diff --git a/src/qemu/qemu_migration_params.c b/src/qemu/qemu_migration_params.c
index df2384b213..36174a66d8 100644
--- a/src/qemu/qemu_migration_params.c
+++ b/src/qemu/qemu_migration_params.c
@@ -1109,6 +1109,28 @@ qemuMigrationParamsFetch(virQEMUDriver *driver,
}
+void
+qemuMigrationParamsSetCap(qemuMigrationParams *migParams,
+ virQEMUCapsFlags flag)
+{
+ ignore_value(virBitmapSetBit(migParams->caps, flag));
+}
+
+
+int
+qemuMigrationParamsSetInt(qemuMigrationParams *migParams,
+ qemuMigrationParam param,
+ int value)
+{
+ if (qemuMigrationParamsCheckType(param, QEMU_MIGRATION_PARAM_TYPE_INT) < 0)
+ return -1;
+
+ migParams->params[param].value.i = value;
+ migParams->params[param].set = true;
+ return 0;
+}
+
+
int
qemuMigrationParamsSetULL(qemuMigrationParams *migParams,
qemuMigrationParam param,
diff --git a/src/qemu/qemu_migration_params.h b/src/qemu/qemu_migration_params.h
index 4a8815e776..99af73b4a4 100644
--- a/src/qemu/qemu_migration_params.h
+++ b/src/qemu/qemu_migration_params.h
@@ -123,6 +123,15 @@ qemuMigrationParamsFetch(virQEMUDriver *driver,
int asyncJob,
qemuMigrationParams **migParams);
+void
+qemuMigrationParamsSetCap(qemuMigrationParams *migParams,
+ virQEMUCapsFlags flag);
+
+int
+qemuMigrationParamsSetInt(qemuMigrationParams *migParams,
+ qemuMigrationParam param,
+ int value);
+
int
qemuMigrationParamsSetULL(qemuMigrationParams *migParams,
qemuMigrationParam param,
diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
index 65d9a3fef5..d8b6635511 100644
--- a/src/qemu/qemu_saveimage.c
+++ b/src/qemu/qemu_saveimage.c
@@ -463,7 +463,7 @@ qemuSaveImageCreate(virQEMUDriver *driver,
const char *path,
virQEMUSaveData *data,
virCommand *compressor,
- int nconn G_GNUC_UNUSED,
+ int nconn,
unsigned int flags,
virDomainAsyncJob asyncJob)
{
@@ -517,8 +517,7 @@ qemuSaveImageCreate(virQEMUDriver *driver,
goto cleanup;
if (chown(sun_path, cfg->user, cfg->group) < 0)
goto cleanup;
- /* still using single fd migration for now */
- if (qemuMigrationSrcToFile(driver, vm, saveFd.fd, compressor, asyncJob) < 0)
+ if (qemuMigrationSrcToFilesMultiFd(driver, vm, asyncJob, sun_path, nconn) <
0)
goto cleanup;
if (qemuSaveImageCloseMultiFd(multiFd, nconn, vm) < 0)
goto cleanup;
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 16/20] qemu: add parameter to qemuMigrationDstRun to skip waiting
The distinction on whether to wait for the migration completion
or not was made on the async job type,
but with the future addition of multifd migration from files,
we need a way to avoid waiting, so we can prepare multifd
migration parameters before starting the transfers.
Adapt all callers.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/qemu/qemu_driver.c | 8 ++++----
src/qemu/qemu_migration.c | 18 ++++++++++--------
src/qemu/qemu_migration.h | 3 ++-
src/qemu/qemu_process.c | 3 ++-
src/qemu/qemu_process.h | 5 +++--
src/qemu/qemu_saveimage.c | 4 +++-
src/qemu/qemu_saveimage.h | 1 +
src/qemu/qemu_snapshot.c | 4 ++--
8 files changed, 27 insertions(+), 19 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 6851270be3..7ff7072da0 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -1630,7 +1630,7 @@ static virDomainPtr qemuDomainCreateXML(virConnectPtr conn,
}
if (qemuProcessStart(conn, driver, vm, NULL, VIR_ASYNC_JOB_START,
- NULL, -1, NULL, NULL,
+ NULL, -1, NULL, false, NULL,
VIR_NETDEV_VPORT_PROFILE_OP_CREATE,
start_flags) < 0) {
virDomainAuditStart(vm, "booted", false);
@@ -5908,7 +5908,7 @@ qemuDomainRestoreInternal(virConnectPtr conn,
goto cleanup;
ret = qemuSaveImageStartVM(conn, driver, vm, &saveFd.fd, data, path,
- false, reset_nvram, VIR_ASYNC_JOB_START);
+ false, reset_nvram, true, VIR_ASYNC_JOB_START);
qemuProcessEndJob(vm);
@@ -6229,7 +6229,7 @@ qemuDomainObjRestore(virConnectPtr conn,
virDomainObjAssignDef(vm, &def, true, NULL);
ret = qemuSaveImageStartVM(conn, driver, vm, &saveFd.fd, data, path,
- start_paused, reset_nvram, asyncJob);
+ start_paused, reset_nvram, true, asyncJob);
cleanup:
virQEMUSaveDataFree(data);
@@ -6492,7 +6492,7 @@ qemuDomainObjStart(virConnectPtr conn,
}
ret = qemuProcessStart(conn, driver, vm, NULL, asyncJob,
- NULL, -1, NULL, NULL,
+ NULL, -1, NULL, false, NULL,
VIR_NETDEV_VPORT_PROFILE_OP_CREATE, start_flags);
virDomainAuditStart(vm, "booted", ret >= 0);
if (ret >= 0) {
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 371db6a41c..542428ab8e 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -2139,7 +2139,8 @@ int
qemuMigrationDstRun(virQEMUDriver *driver,
virDomainObj *vm,
const char *uri,
- virDomainAsyncJob asyncJob)
+ virDomainAsyncJob asyncJob,
+ bool wait)
{
qemuDomainObjPrivate *priv = vm->privateData;
int rv;
@@ -2160,14 +2161,15 @@ qemuMigrationDstRun(virQEMUDriver *driver,
if (rv < 0)
return -1;
- if (asyncJob == VIR_ASYNC_JOB_MIGRATION_IN) {
- /* qemuMigrationDstWaitForCompletion is called from the Finish phase */
- return 0;
+ if (wait) {
+ /*
+ * the Migration Finish phase, as well as the multifd load from files,
+ * need to call qemuMigrationDstWaitForCompletion separately, not here.
+ */
+ if (qemuMigrationDstWaitForCompletion(driver, vm, asyncJob, false) < 0)
+ return -1;
}
- if (qemuMigrationDstWaitForCompletion(driver, vm, asyncJob, false) < 0)
- return -1;
-
return 0;
}
@@ -3041,7 +3043,7 @@ qemuMigrationDstPrepareAny(virQEMUDriver *driver,
}
if (qemuMigrationDstRun(driver, vm, incoming->uri,
- VIR_ASYNC_JOB_MIGRATION_IN) < 0)
+ VIR_ASYNC_JOB_MIGRATION_IN, false) < 0)
goto stopjob;
if (qemuProcessFinishStartup(driver, vm, VIR_ASYNC_JOB_MIGRATION_IN,
diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h
index ddc8e65489..c3c48c19c0 100644
--- a/src/qemu/qemu_migration.h
+++ b/src/qemu/qemu_migration.h
@@ -255,7 +255,8 @@ int
qemuMigrationDstRun(virQEMUDriver *driver,
virDomainObj *vm,
const char *uri,
- virDomainAsyncJob asyncJob);
+ virDomainAsyncJob asyncJob,
+ bool wait);
void
qemuMigrationAnyPostcopyFailed(virQEMUDriver *driver,
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index b0b00eb0a2..0a1e7985fb 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -7788,6 +7788,7 @@ qemuProcessStart(virConnectPtr conn,
const char *migrateFrom,
int migrateFd,
const char *migratePath,
+ bool wait_incoming,
virDomainMomentObj *snapshot,
virNetDevVPortProfileOp vmop,
unsigned int flags)
@@ -7850,7 +7851,7 @@ qemuProcessStart(virConnectPtr conn,
relabel = true;
if (incoming) {
- if (qemuMigrationDstRun(driver, vm, incoming->uri, asyncJob) < 0)
+ if (qemuMigrationDstRun(driver, vm, incoming->uri, asyncJob, wait_incoming)
< 0)
goto stop;
} else {
/* Refresh state of devices from QEMU. During migration this happens
diff --git a/src/qemu/qemu_process.h b/src/qemu/qemu_process.h
index f81bfd930a..5a1d005cb0 100644
--- a/src/qemu/qemu_process.h
+++ b/src/qemu/qemu_process.h
@@ -86,8 +86,9 @@ int qemuProcessStart(virConnectPtr conn,
virCPUDef *updatedCPU,
virDomainAsyncJob asyncJob,
const char *migrateFrom,
- int stdin_fd,
- const char *stdin_path,
+ int fd,
+ const char *migratePath,
+ bool wait_incoming,
virDomainMomentObj *snapshot,
virNetDevVPortProfileOp vmop,
unsigned int flags);
diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
index d8b6635511..d58e070bf7 100644
--- a/src/qemu/qemu_saveimage.c
+++ b/src/qemu/qemu_saveimage.c
@@ -749,6 +749,7 @@ qemuSaveImageStartVM(virConnectPtr conn,
const char *path,
bool start_paused,
bool reset_nvram,
+ bool wait_incoming,
virDomainAsyncJob asyncJob)
{
qemuDomainObjPrivate *priv = vm->privateData;
@@ -803,7 +804,8 @@ qemuSaveImageStartVM(virConnectPtr conn,
priv->disableSlirp = true;
if (qemuProcessStart(conn, driver, vm, cookie ? cookie->cpu : NULL,
- asyncJob, "stdio", *fd, path, NULL,
+ asyncJob, "stdio", *fd, path, wait_incoming,
+ NULL,
VIR_NETDEV_VPORT_PROFILE_OP_RESTORE,
start_flags) == 0)
started = true;
diff --git a/src/qemu/qemu_saveimage.h b/src/qemu/qemu_saveimage.h
index b775c5eb08..7be0892dde 100644
--- a/src/qemu/qemu_saveimage.h
+++ b/src/qemu/qemu_saveimage.h
@@ -97,6 +97,7 @@ qemuSaveImageStartVM(virConnectPtr conn,
const char *path,
bool start_paused,
bool reset_nvram,
+ bool wait_incoming,
virDomainAsyncJob asyncJob)
ATTRIBUTE_NONNULL(4) ATTRIBUTE_NONNULL(5) ATTRIBUTE_NONNULL(6);
diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c
index 2e445e8296..626a5a14b9 100644
--- a/src/qemu/qemu_snapshot.c
+++ b/src/qemu/qemu_snapshot.c
@@ -2092,7 +2092,7 @@ qemuSnapshotRevertActive(virDomainObj *vm,
rc = qemuProcessStart(snapshot->domain->conn, driver, vm,
cookie ? cookie->cpu : NULL,
- VIR_ASYNC_JOB_START, NULL, -1, NULL, snap,
+ VIR_ASYNC_JOB_START, NULL, -1, NULL, false, snap,
VIR_NETDEV_VPORT_PROFILE_OP_CREATE,
start_flags);
virDomainAuditStart(vm, "from-snapshot", rc >= 0);
@@ -2215,7 +2215,7 @@ qemuSnapshotRevertInactive(virDomainObj *vm,
start_flags |= paused ? VIR_QEMU_PROCESS_START_PAUSED : 0;
rc = qemuProcessStart(snapshot->domain->conn, driver, vm, NULL,
- VIR_ASYNC_JOB_START, NULL, -1, NULL, NULL,
+ VIR_ASYNC_JOB_START, NULL, -1, NULL, false, NULL,
VIR_NETDEV_VPORT_PROFILE_OP_CREATE,
start_flags);
virDomainAuditStart(vm, "from-snapshot", rc >= 0);
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 17/20] qemu: implement qemuSaveImageLoadMultiFd
use multifd to restore parallel saves.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/qemu/qemu_driver.c | 12 +++--
src/qemu/qemu_migration.c | 2 +-
src/qemu/qemu_migration.h | 6 +++
src/qemu/qemu_saveimage.c | 111 +++++++++++++++++++++++++++++++++++++-
src/qemu/qemu_saveimage.h | 9 +++-
5 files changed, 133 insertions(+), 7 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 7ff7072da0..2d90865ece 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -5815,7 +5815,7 @@ static int
qemuDomainRestoreInternal(virConnectPtr conn,
const char *path,
const char *dxml,
- int nchannels G_GNUC_UNUSED,
+ int nchannels,
unsigned int flags,
int (*ensureACL)(virConnectPtr, virDomainDef *))
{
@@ -5907,8 +5907,14 @@ qemuDomainRestoreInternal(virConnectPtr conn,
flags) < 0)
goto cleanup;
- ret = qemuSaveImageStartVM(conn, driver, vm, &saveFd.fd, data, path,
- false, reset_nvram, true, VIR_ASYNC_JOB_START);
+ if (flags & VIR_DOMAIN_SAVE_PARALLEL) {
+ ret = qemuSaveImageLoadMultiFd(conn, vm, oflags, data, reset_nvram,
+ &saveFd, nchannels, VIR_ASYNC_JOB_START);
+
+ } else {
+ ret = qemuSaveImageStartVM(conn, driver, vm, &saveFd.fd, data, path,
+ false, reset_nvram, true, VIR_ASYNC_JOB_START);
+ }
qemuProcessEndJob(vm);
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 542428ab8e..7bab913fe5 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -1933,7 +1933,7 @@ qemuMigrationSrcWaitForCompletion(virQEMUDriver *driver,
}
-static int
+int
qemuMigrationDstWaitForCompletion(virQEMUDriver *driver,
virDomainObj *vm,
virDomainAsyncJob asyncJob,
diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h
index c3c48c19c0..38f4877cf0 100644
--- a/src/qemu/qemu_migration.h
+++ b/src/qemu/qemu_migration.h
@@ -191,6 +191,12 @@ qemuMigrationDstFinish(virQEMUDriver *driver,
int retcode,
bool v3proto);
+int
+qemuMigrationDstWaitForCompletion(virQEMUDriver *driver,
+ virDomainObj *vm,
+ virDomainAsyncJob asyncJob,
+ bool postcopy);
+
int
qemuMigrationSrcConfirm(virQEMUDriver *driver,
virDomainObj *vm,
diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
index d58e070bf7..2bc81035ae 100644
--- a/src/qemu/qemu_saveimage.c
+++ b/src/qemu/qemu_saveimage.c
@@ -551,6 +551,106 @@ qemuSaveImageCreate(virQEMUDriver *driver,
}
+int qemuSaveImageLoadMultiFd(virConnectPtr conn, virDomainObj *vm, int oflags,
+ virQEMUSaveData *data, bool reset_nvram,
+ virQEMUSaveFd *saveFd, int nchannels,
+ virDomainAsyncJob asyncJob)
+{
+ virQEMUDriver *driver = conn->privateData;
+ qemuDomainObjPrivate *priv = vm->privateData;
+ virQEMUSaveFd *multiFd = NULL;
+ g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
+ g_autoptr(virCommand) cmd = NULL;
+ g_autofree char *helper_path = NULL;
+ g_autofree char *sun_path = g_strdup_printf("%s/restore-multifd.sock",
cfg->saveDir);
+ int ret = -1;
+
+ if (!(helper_path = virFileFindResource("libvirt_multifd_helper",
+ abs_top_builddir "/src",
+ LIBEXECDIR)))
+ goto cleanup;
+ cmd = virCommandNewArgList(helper_path, sun_path, NULL);
+ virCommandAddArgFormat(cmd, "%d", nchannels);
+ virCommandAddArgFormat(cmd, "%d", saveFd->fd);
+ virCommandPassFD(cmd, saveFd->fd, 0);
+
+ /* Perform parallel multifd migration from files (main fd + channels) */
+ if (!(multiFd = qemuSaveImageCreateMultiFd(driver, vm, cmd, saveFd->path, oflags,
cfg, nchannels)))
+ goto cleanup;
+ if (qemuSaveImageStartVM(conn, driver, vm, NULL, data, sun_path,
+ false, reset_nvram, false, asyncJob) < 0)
+ goto cleanup;
+ if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_MULTIFD)) {
+ virReportError(VIR_ERR_OPERATION_FAILED, "%s",
+ _("QEMU multifd not supported"));
+ goto cleanup;
+ } else {
+ g_autoptr(qemuMigrationParams) migParams = qemuMigrationParamsNew();
+ bool bwParam = virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATION_PARAM_BANDWIDTH);
+
+ if (bwParam) {
+ if (qemuMigrationParamsSetULL(migParams,
+ QEMU_MIGRATION_PARAM_MAX_BANDWIDTH,
+ QEMU_DOMAIN_MIG_BANDWIDTH_MAX * 1024 * 1024)
< 0)
+ goto cleanup;
+ priv->migMaxBandwidth = QEMU_DOMAIN_MIG_BANDWIDTH_MAX;
+ } else {
+ if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) == 0) {
+ qemuMonitorSetMigrationSpeed(priv->mon,
+ QEMU_DOMAIN_MIG_BANDWIDTH_MAX);
+ priv->migMaxBandwidth = QEMU_DOMAIN_MIG_BANDWIDTH_MAX;
+ qemuDomainObjExitMonitor(vm);
+ }
+ }
+ qemuMigrationParamsSetCap(migParams, QEMU_MIGRATION_CAP_MULTIFD);
+ if (qemuMigrationParamsSetInt(migParams,
+ QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
+ nchannels) < 0)
+ goto cleanup;
+ if (qemuMigrationParamsApply(driver, vm, asyncJob, migParams) < 0)
+ goto cleanup;
+
+ if (!virDomainObjIsActive(vm)) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("guest unexpectedly quit"));
+ goto cleanup;
+ }
+ /* multifd helper can now connect, then wait for migration to complete */
+ if (virCommandRunAsync(cmd, NULL) < 0)
+ goto cleanup;
+
+ if (qemuMigrationDstWaitForCompletion(driver, vm, asyncJob, false) < 0)
+ goto cleanup;
+
+ if (qemuSaveImageCloseMultiFd(multiFd, nchannels, vm) < 0)
+ goto cleanup;
+
+ if (qemuProcessRefreshState(driver, vm, asyncJob) < 0)
+ goto cleanup;
+
+ /* run 'cont' on the destination */
+ if (qemuProcessStartCPUs(driver, vm,
+ VIR_DOMAIN_RUNNING_RESTORED,
+ asyncJob) < 0) {
+ if (virGetLastErrorCode() == VIR_ERR_OK)
+ virReportError(VIR_ERR_OPERATION_FAILED,
+ "%s", _("failed to resume domain"));
+ goto cleanup;
+ }
+ if (virDomainObjSave(vm, driver->xmlopt, cfg->stateDir) < 0) {
+ VIR_WARN("Failed to save status on vm %s", vm->def->name);
+ goto cleanup;
+ }
+ }
+ qemuDomainEventEmitJobCompleted(driver, vm);
+ ret = 0;
+
+ cleanup:
+ ret = qemuSaveImageFreeMultiFd(multiFd, vm, nchannels, ret);
+ return ret;
+}
+
+
/* qemuSaveImageGetCompressionProgram:
* @imageFormat: String representation from qemu.conf for the compression
* image format being used (dump, save, or snapshot).
@@ -757,6 +857,7 @@ qemuSaveImageStartVM(virConnectPtr conn,
bool started = false;
virObjectEvent *event;
VIR_AUTOCLOSE intermediatefd = -1;
+ g_autofree char *migrate_from = NULL;
g_autoptr(virCommand) cmd = NULL;
g_autofree char *errbuf = NULL;
g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
@@ -803,8 +904,14 @@ qemuSaveImageStartVM(virConnectPtr conn,
if (cookie && !cookie->slirpHelper)
priv->disableSlirp = true;
+ if (fd) {
+ migrate_from = g_strdup("stdio");
+ } else {
+ migrate_from = g_strdup_printf("unix://%s", path);
+ }
+
if (qemuProcessStart(conn, driver, vm, cookie ? cookie->cpu : NULL,
- asyncJob, "stdio", *fd, path, wait_incoming,
+ asyncJob, migrate_from, fd ? *fd : -1, path, wait_incoming,
NULL,
VIR_NETDEV_VPORT_PROFILE_OP_RESTORE,
start_flags) == 0)
@@ -828,7 +935,7 @@ qemuSaveImageStartVM(virConnectPtr conn,
VIR_DEBUG("Decompression binary stderr: %s", NULLSTR(errbuf));
virErrorRestore(&orig_err);
}
- if (VIR_CLOSE(*fd) < 0) {
+ if (fd && VIR_CLOSE(*fd) < 0) {
virReportSystemError(errno, _("cannot close file: %s"), path);
rc = -1;
}
diff --git a/src/qemu/qemu_saveimage.h b/src/qemu/qemu_saveimage.h
index 7be0892dde..ae7b3faa17 100644
--- a/src/qemu/qemu_saveimage.h
+++ b/src/qemu/qemu_saveimage.h
@@ -99,7 +99,7 @@ qemuSaveImageStartVM(virConnectPtr conn,
bool reset_nvram,
bool wait_incoming,
virDomainAsyncJob asyncJob)
- ATTRIBUTE_NONNULL(4) ATTRIBUTE_NONNULL(5) ATTRIBUTE_NONNULL(6);
+ ATTRIBUTE_NONNULL(5) ATTRIBUTE_NONNULL(6);
int
qemuSaveImageOpen(virQEMUDriver *driver,
@@ -117,6 +117,13 @@ qemuSaveImageGetCompressionProgram(const char *imageFormat,
bool use_raw_on_fail)
ATTRIBUTE_NONNULL(2);
+int qemuSaveImageLoadMultiFd(virConnectPtr conn, virDomainObj *vm, int oflags,
+ virQEMUSaveData *data, bool reset_nvram,
+ virQEMUSaveFd *saveFd, int nchannels,
+ virDomainAsyncJob asyncJob)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(4)
+ ATTRIBUTE_NONNULL(6) G_GNUC_WARN_UNUSED_RESULT;
+
int
qemuSaveImageCreate(virQEMUDriver *driver,
virDomainObj *vm,
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 18/20] tools: add parallel parameter to virsh save command
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
docs/manpages/virsh.rst | 23 ++++++++++++++-----
tools/virsh-domain.c | 49 +++++++++++++++++++++++++++++++++--------
2 files changed, 57 insertions(+), 15 deletions(-)
diff --git a/docs/manpages/virsh.rst b/docs/manpages/virsh.rst
index e8568559fa..2bce701057 100644
--- a/docs/manpages/virsh.rst
+++ b/docs/manpages/virsh.rst
@@ -3801,15 +3801,18 @@ save
::
save domain state-file [--bypass-cache] [--xml file]
+ [--parallel] [--parallel-connections connections]
[{--running | --paused}] [--verbose]
-Saves a running domain (RAM, but not disk state) to a state file so that
-it can be restored
-later. Once saved, the domain will no longer be running on the
-system, thus the memory allocated for the domain will be free for
-other domains to use. ``virsh restore`` restores from this state file.
+Saves a paused or running domain (RAM, but not disk state) to one or more
+state files, so that it can be restored later.
+Once saved, the domain will no longer be running on the system,
+thus the memory allocated for the domain will be free for
+other domains to use. ``virsh restore`` restores from state file/s.
+
If *--bypass-cache* is specified, the save will avoid the file system
-cache, although this may slow down the operation.
+cache; depending on the specific scenario this may slow down or speed up
+the operation.
The progress may be monitored using ``domjobinfo`` virsh command and canceled
with ``domjobabort`` command (sent by another virsh instance). Another option
@@ -3831,6 +3834,14 @@ based on the state the domain was in when the save was done;
passing
either the *--running* or *--paused* flag will allow overriding which
state the ``restore`` should use.
+*--parallel* option will cause the save data to be sent over multiple
+parallel connections to multiple files. The main save file is specified
+with ``state-file``, and a number of additional connections can be
+set using *--parallel-connections*, which will save to files named
+``state-file``.1 , ``state-file``.2 ... up to ``connections``.
+
+Parallel connections may help in speeding up the save operation.
+
Domain saved state files assume that disk images will be unchanged
between the creation and restore point. For a more complete system
restore point, where the disk state is saved alongside the memory
diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index df8df9c2f3..1e3adaa1be 100644
--- a/tools/virsh-domain.c
+++ b/tools/virsh-domain.c
@@ -4164,6 +4164,14 @@ static const vshCmdOptDef opts_save[] = {
.type = VSH_OT_BOOL,
.help = N_("avoid file system cache when saving")
},
+ {.name = "parallel",
+ .type = VSH_OT_BOOL,
+ .help = N_("enable parallel save to files")
+ },
+ {.name = "parallel-connections",
+ .type = VSH_OT_INT,
+ .help = N_("number of connections/files for parallel save")
+ },
{.name = "xml",
.type = VSH_OT_STRING,
.completer = virshCompletePathLocalExisting,
@@ -4193,6 +4201,11 @@ doSave(void *opaque)
g_autoptr(virshDomain) dom = NULL;
const char *name = NULL;
const char *to = NULL;
+ virTypedParameterPtr params = NULL;
+ int nparams = 0;
+ int maxparams = 0;
+ int intOpt = 0;
+ int rv = -1;
unsigned int flags = 0;
const char *xmlfile = NULL;
g_autofree char *xml = NULL;
@@ -4206,29 +4219,46 @@ doSave(void *opaque)
goto out_sig;
#endif /* !WIN32 */
- if (vshCommandOptStringReq(ctl, cmd, "file", &to) < 0)
+ if ((rv = vshCommandOptStringReq(ctl, cmd, "file", &to)) < 0) {
goto out;
-
+ } else {
+ if (virTypedParamsAddString(¶ms, &nparams, &maxparams,
+ VIR_SAVE_PARAM_FILE, to) < 0)
+ goto out;
+ }
if (vshCommandOptBool(cmd, "bypass-cache"))
flags |= VIR_DOMAIN_SAVE_BYPASS_CACHE;
+ if (vshCommandOptBool(cmd, "parallel"))
+ flags |= VIR_DOMAIN_SAVE_PARALLEL;
+ if ((rv = vshCommandOptInt(ctl, cmd, "parallel-connections", &intOpt))
< 0) {
+ goto out;
+ } else if (rv > 0) {
+ if (virTypedParamsAddInt(¶ms, &nparams, &maxparams,
+ VIR_SAVE_PARAM_PARALLEL_CONNECTIONS, intOpt) < 0)
+ goto out;
+ }
if (vshCommandOptBool(cmd, "running"))
flags |= VIR_DOMAIN_SAVE_RUNNING;
if (vshCommandOptBool(cmd, "paused"))
flags |= VIR_DOMAIN_SAVE_PAUSED;
- if (vshCommandOptStringReq(ctl, cmd, "xml", &xmlfile) < 0)
+ if ((rv = vshCommandOptStringReq(ctl, cmd, "xml", &xmlfile)) < 0)
goto out;
if (!(dom = virshCommandOptDomain(ctl, cmd, &name)))
goto out;
- if (xmlfile &&
- virFileReadAll(xmlfile, VSH_MAX_XML_FILE, &xml) < 0) {
- vshReportError(ctl);
- goto out;
+ if (xmlfile) {
+ if (virFileReadAll(xmlfile, VSH_MAX_XML_FILE, &xml) < 0) {
+ vshReportError(ctl);
+ goto out;
+ } else if (virTypedParamsAddString(¶ms, &nparams, &maxparams,
+ VIR_SAVE_PARAM_DXML, xml) < 0)
+ goto out;
}
-
- if (flags || xml) {
+ if (flags & VIR_DOMAIN_SAVE_PARALLEL) {
+ rc = virDomainSaveParametersFlags(dom, params, nparams, flags);
+ } else if (flags || xml) {
rc = virDomainSaveFlags(dom, to, xml, flags);
} else {
rc = virDomainSave(dom, to);
@@ -4242,6 +4272,7 @@ doSave(void *opaque)
data->ret = 0;
out:
+ virTypedParamsFree(params, nparams);
#ifndef WIN32
pthread_sigmask(SIG_SETMASK, &oldsigmask, NULL);
out_sig:
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 19/20] tools: add parallel parameter to virsh restore command
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
docs/manpages/virsh.rst | 11 +++++++++-
tools/virsh-domain.c | 47 ++++++++++++++++++++++++++++++++++-------
2 files changed, 49 insertions(+), 9 deletions(-)
diff --git a/docs/manpages/virsh.rst b/docs/manpages/virsh.rst
index 2bce701057..21bfc8b16b 100644
--- a/docs/manpages/virsh.rst
+++ b/docs/manpages/virsh.rst
@@ -3752,12 +3752,14 @@ restore
::
restore state-file [--bypass-cache] [--xml file]
+ [--parallel] [--parallel-connections connections]
[{--running | --paused}] [--reset-nvram]
Restores a domain from a ``virsh save`` state file. See *save* for more info.
If *--bypass-cache* is specified, the restore will avoid the file system
-cache, although this may slow down the operation.
+cache; depending on the specific scenario this may slow down or speed up
+the operation.
*--xml* ``file`` is usually omitted, but can be used to supply an
alternative XML file for use on the restored guest with changes only
@@ -3773,6 +3775,13 @@ domain should be started in.
If *--reset-nvram* is specified, any existing NVRAM file will be deleted
and re-initialized from its pristine template.
+*--parallel* option will cause the save data to be loaded from multiple
+state files over parallel connections. The main save file is specified
+with ``state-file``, and the number of additional channels can be set
+using *--parallel-connections*
+
+Parallel connections may help in speeding up the save operation.
+
``Note``: To avoid corrupting file system contents within the domain, you
should not reuse the saved state file for a second ``restore`` unless you
have also reverted all storage volumes back to the same contents as when
diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index 1e3adaa1be..3a5df609a7 100644
--- a/tools/virsh-domain.c
+++ b/tools/virsh-domain.c
@@ -5302,6 +5302,14 @@ static const vshCmdOptDef opts_restore[] = {
.type = VSH_OT_BOOL,
.help = N_("avoid file system cache when restoring")
},
+ {.name = "parallel",
+ .type = VSH_OT_BOOL,
+ .help = N_("enable parallel restore")
+ },
+ {.name = "parallel-connections",
+ .type = VSH_OT_INT,
+ .help = N_("number of connections/files for parallel restore")
+ },
{.name = "xml",
.type = VSH_OT_STRING,
.completer = virshCompletePathLocalExisting,
@@ -5326,17 +5334,36 @@ static bool
cmdRestore(vshControl *ctl, const vshCmd *cmd)
{
const char *from = NULL;
+ virTypedParameterPtr params = NULL;
+ int nparams = 0;
+ int maxparams = 0;
+ int intOpt = 0;
unsigned int flags = 0;
const char *xmlfile = NULL;
g_autofree char *xml = NULL;
virshControl *priv = ctl->privData;
- int rc;
+ int rc = -1;
- if (vshCommandOptStringReq(ctl, cmd, "file", &from) < 0)
- return false;
+ if (vshCommandOptStringReq(ctl, cmd, "file", &from) < 0) {
+ goto out;
+ } else {
+ if (virTypedParamsAddString(¶ms, &nparams, &maxparams,
+ VIR_SAVE_PARAM_FILE, from) < 0)
+ goto out;
+ }
if (vshCommandOptBool(cmd, "bypass-cache"))
flags |= VIR_DOMAIN_SAVE_BYPASS_CACHE;
+ if (vshCommandOptBool(cmd, "parallel"))
+ flags |= VIR_DOMAIN_SAVE_PARALLEL;
+ if ((rc = vshCommandOptInt(ctl, cmd, "parallel-connections", &intOpt))
< 0) {
+ goto out;
+ } else if (rc > 0) {
+ rc = -1;
+ if (virTypedParamsAddInt(¶ms, &nparams, &maxparams,
+ VIR_SAVE_PARAM_PARALLEL_CONNECTIONS, intOpt) < 0)
+ goto out;
+ }
if (vshCommandOptBool(cmd, "running"))
flags |= VIR_DOMAIN_SAVE_RUNNING;
if (vshCommandOptBool(cmd, "paused"))
@@ -5345,13 +5372,15 @@ cmdRestore(vshControl *ctl, const vshCmd *cmd)
flags |= VIR_DOMAIN_SAVE_RESET_NVRAM;
if (vshCommandOptStringReq(ctl, cmd, "xml", &xmlfile) < 0)
- return false;
+ goto out;
if (xmlfile &&
virFileReadAll(xmlfile, VSH_MAX_XML_FILE, &xml) < 0)
- return false;
+ goto out;
- if (flags || xml) {
+ if (flags & VIR_DOMAIN_SAVE_PARALLEL) {
+ rc = virDomainRestoreParametersFlags(priv->conn, params, nparams, flags);
+ } else if (flags || xml) {
rc = virDomainRestoreFlags(priv->conn, from, xml, flags);
} else {
rc = virDomainRestore(priv->conn, from);
@@ -5359,11 +5388,13 @@ cmdRestore(vshControl *ctl, const vshCmd *cmd)
if (rc < 0) {
vshError(ctl, _("Failed to restore domain from %s"), from);
- return false;
+ goto out;
}
vshPrintExtra(ctl, _("Domain restored from %s\n"), from);
- return true;
+ out:
+ virTypedParamsFree(params, nparams);
+ return rc >= 0;
}
/*
--
2.34.1
4:13 p.m.
New subject: [libvirt RFCv4 20/20] qemu: add migration parameter multifd-compression
use zstd which is the only really interesting one.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/qemu/qemu_capabilities.c | 2 +
src/qemu/qemu_capabilities.h | 1 +
src/qemu/qemu_migration.c | 6 +++
src/qemu/qemu_migration_params.c | 49 +++++++++----------
src/qemu/qemu_migration_params.h | 6 +++
src/qemu/qemu_saveimage.c | 6 +++
.../caps_5.0.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 1 +
.../caps_5.0.0.riscv64.xml | 1 +
.../caps_5.0.0.x86_64.xml | 1 +
.../qemucapabilitiesdata/caps_5.1.0.sparc.xml | 1 +
.../caps_5.1.0.x86_64.xml | 1 +
.../caps_5.2.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_5.2.0.ppc64.xml | 1 +
.../caps_5.2.0.riscv64.xml | 1 +
.../qemucapabilitiesdata/caps_5.2.0.s390x.xml | 1 +
.../caps_5.2.0.x86_64.xml | 1 +
.../caps_6.0.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_6.0.0.s390x.xml | 1 +
.../caps_6.0.0.x86_64.xml | 1 +
.../caps_6.1.0.x86_64.xml | 1 +
.../caps_6.2.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_6.2.0.ppc64.xml | 1 +
.../caps_6.2.0.x86_64.xml | 1 +
.../caps_7.0.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_7.0.0.ppc64.xml | 1 +
.../caps_7.0.0.x86_64.xml | 1 +
27 files changed, 66 insertions(+), 25 deletions(-)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 1aba26a86a..3b99e66ab5 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -675,6 +675,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
/* 430 */
"migrate-multifd", /* QEMU_CAPS_MIGRATE_MULTIFD */
+ "migration-param.multifd-compression", /*
QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION */
);
@@ -1612,6 +1613,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsQMPSchemaQueries[] =
{
{ "migrate-set-parameters/arg-type/downtime-limit",
QEMU_CAPS_MIGRATION_PARAM_DOWNTIME },
{ "migrate-set-parameters/arg-type/xbzrle-cache-size",
QEMU_CAPS_MIGRATION_PARAM_XBZRLE_CACHE_SIZE },
{ "migrate-set-parameters/arg-type/block-bitmap-mapping/bitmaps/transform",
QEMU_CAPS_MIGRATION_PARAM_BLOCK_BITMAP_MAPPING },
+ { "migrate-set-parameters/arg-type/multifd-compression",
QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION },
{ "nbd-server-start/arg-type/tls-creds", QEMU_CAPS_NBD_TLS },
{ "nbd-server-add/arg-type/bitmap", QEMU_CAPS_NBD_BITMAP },
{ "netdev_add/arg-type/+vhost-vdpa", QEMU_CAPS_NETDEV_VHOST_VDPA },
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index b089f83da1..e226b1a51a 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -650,6 +650,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check
*/
/* 430 */
QEMU_CAPS_MIGRATE_MULTIFD, /* migrate can set multifd parameter */
+ QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION, /* multifd-compression in
migrate-set-parameters */
QEMU_CAPS_LAST /* this must always be the last item */
} virQEMUCapsFlags;
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 7bab913fe5..f9c86de67e 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -5950,6 +5950,12 @@ qemuMigrationSrcToFileAux(virQEMUDriver *driver, virDomainObj *vm,
QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
nchannels) < 0)
return -1;
+ if (virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION)) {
+ if (qemuMigrationParamsSetString(migParams,
+ QEMU_MIGRATION_PARAM_MULTIFD_COMPRESSION,
+ "zstd") < 0)
+ return -1;
+ }
}
if (needParams && qemuMigrationParamsApply(driver, vm, asyncJob, migParams)
< 0)
diff --git a/src/qemu/qemu_migration_params.c b/src/qemu/qemu_migration_params.c
index 36174a66d8..f6b9dc337d 100644
--- a/src/qemu/qemu_migration_params.c
+++ b/src/qemu/qemu_migration_params.c
@@ -115,6 +115,7 @@ VIR_ENUM_IMPL(qemuMigrationParam,
"xbzrle-cache-size",
"max-postcopy-bandwidth",
"multifd-channels",
+ "multifd-compression",
);
typedef struct _qemuMigrationParamsAlwaysOnItem qemuMigrationParamsAlwaysOnItem;
@@ -234,6 +235,7 @@ static const qemuMigrationParamType qemuMigrationParamTypes[] = {
[QEMU_MIGRATION_PARAM_XBZRLE_CACHE_SIZE] = QEMU_MIGRATION_PARAM_TYPE_ULL,
[QEMU_MIGRATION_PARAM_MAX_POSTCOPY_BANDWIDTH] = QEMU_MIGRATION_PARAM_TYPE_ULL,
[QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS] = QEMU_MIGRATION_PARAM_TYPE_INT,
+ [QEMU_MIGRATION_PARAM_MULTIFD_COMPRESSION] = QEMU_MIGRATION_PARAM_TYPE_STRING,
};
G_STATIC_ASSERT(G_N_ELEMENTS(qemuMigrationParamTypes) == QEMU_MIGRATION_PARAM_LAST);
@@ -898,31 +900,6 @@ qemuMigrationParamsApply(virQEMUDriver *driver,
}
-/**
- * qemuMigrationParamsSetString:
- * @migrParams: migration parameter object
- * @param: parameter to set
- * @value: new value
- *
- * Enables and sets the migration parameter @param in @migrParams. Returns 0 on
- * success and -1 on error. Libvirt error is reported.
- */
-static int
-qemuMigrationParamsSetString(qemuMigrationParams *migParams,
- qemuMigrationParam param,
- const char *value)
-{
- if (qemuMigrationParamsCheckType(param, QEMU_MIGRATION_PARAM_TYPE_STRING) < 0)
- return -1;
-
- migParams->params[param].value.s = g_strdup(value);
-
- migParams->params[param].set = true;
-
- return 0;
-}
-
-
/* qemuMigrationParamsEnableTLS
* @driver: pointer to qemu driver
* @vm: domain object
@@ -1144,6 +1121,28 @@ qemuMigrationParamsSetULL(qemuMigrationParams *migParams,
return 0;
}
+/**
+ * qemuMigrationParamsSetString:
+ * @migrParams: migration parameter object
+ * @param: parameter to set
+ * @value: new value
+ *
+ * Enables and sets the migration parameter @param in @migrParams. Returns 0 on
+ * success and -1 on error. Libvirt error is reported.
+ */
+int
+qemuMigrationParamsSetString(qemuMigrationParams *migParams,
+ qemuMigrationParam param,
+ const char *value)
+{
+ if (qemuMigrationParamsCheckType(param, QEMU_MIGRATION_PARAM_TYPE_STRING) < 0)
+ return -1;
+
+ migParams->params[param].value.s = g_strdup(value);
+ migParams->params[param].set = true;
+ return 0;
+}
+
/**
* Returns -1 on error,
diff --git a/src/qemu/qemu_migration_params.h b/src/qemu/qemu_migration_params.h
index 99af73b4a4..23a4e0c8a2 100644
--- a/src/qemu/qemu_migration_params.h
+++ b/src/qemu/qemu_migration_params.h
@@ -60,6 +60,7 @@ typedef enum {
QEMU_MIGRATION_PARAM_XBZRLE_CACHE_SIZE,
QEMU_MIGRATION_PARAM_MAX_POSTCOPY_BANDWIDTH,
QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
+ QEMU_MIGRATION_PARAM_MULTIFD_COMPRESSION,
QEMU_MIGRATION_PARAM_LAST
} qemuMigrationParam;
@@ -137,6 +138,11 @@ qemuMigrationParamsSetULL(qemuMigrationParams *migParams,
qemuMigrationParam param,
unsigned long long value);
+int
+qemuMigrationParamsSetString(qemuMigrationParams *migParams,
+ qemuMigrationParam param,
+ const char *value);
+
int
qemuMigrationParamsGetULL(qemuMigrationParams *migParams,
qemuMigrationParam param,
diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
index 2bc81035ae..a1e9e1c3e8 100644
--- a/src/qemu/qemu_saveimage.c
+++ b/src/qemu/qemu_saveimage.c
@@ -607,6 +607,12 @@ int qemuSaveImageLoadMultiFd(virConnectPtr conn, virDomainObj *vm,
int oflags,
QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
nchannels) < 0)
goto cleanup;
+ if (virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION)) {
+ if (qemuMigrationParamsSetString(migParams,
+ QEMU_MIGRATION_PARAM_MULTIFD_COMPRESSION,
+ "zstd") < 0)
+ goto cleanup;
+ }
if (qemuMigrationParamsApply(driver, vm, asyncJob, migParams) < 0)
goto cleanup;
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
index c45b2e6cf6..1d032789b7 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
@@ -176,6 +176,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>5000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
index a3ad743d70..4748bf791e 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
@@ -182,6 +182,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>5000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml
index e1b5cac26b..859638fb1c 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml
@@ -168,6 +168,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>5000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>0</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
index 796adb9066..305ae0bf26 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
@@ -216,6 +216,7 @@
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='virtio-iommu-pci'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>5000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.1.0.sparc.xml
b/tests/qemucapabilitiesdata/caps_5.1.0.sparc.xml
index cb203df125..e0ff08a445 100644
--- a/tests/qemucapabilitiesdata/caps_5.1.0.sparc.xml
+++ b/tests/qemucapabilitiesdata/caps_5.1.0.sparc.xml
@@ -88,6 +88,7 @@
<flag name='query-display-options'/>
<flag name='memory-backend-file.prealloc-threads'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>5001000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>0</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
index 7479d942a2..9f089f551e 100644
--- a/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
@@ -220,6 +220,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>5001000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_5.2.0.aarch64.xml
index 268d1444ad..3de49adf5b 100644
--- a/tests/qemucapabilitiesdata/caps_5.2.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.2.0.aarch64.xml
@@ -183,6 +183,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>5002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.ppc64.xml
b/tests/qemucapabilitiesdata/caps_5.2.0.ppc64.xml
index eabf4b600c..ec2ee445a1 100644
--- a/tests/qemucapabilitiesdata/caps_5.2.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.2.0.ppc64.xml
@@ -187,6 +187,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>5002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.riscv64.xml
b/tests/qemucapabilitiesdata/caps_5.2.0.riscv64.xml
index 0dbaf5a5ec..cf250f2e42 100644
--- a/tests/qemucapabilitiesdata/caps_5.2.0.riscv64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.2.0.riscv64.xml
@@ -173,6 +173,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>5002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>0</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.s390x.xml
b/tests/qemucapabilitiesdata/caps_5.2.0.s390x.xml
index b0fbab9cb5..6dc5f25f36 100644
--- a/tests/qemucapabilitiesdata/caps_5.2.0.s390x.xml
+++ b/tests/qemucapabilitiesdata/caps_5.2.0.s390x.xml
@@ -141,6 +141,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>5002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>39100243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
index 1a1717bf2a..69bfdcea01 100644
--- a/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
@@ -224,6 +224,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>5002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.0.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_6.0.0.aarch64.xml
index 1c18d122e2..cd25ee8ccb 100644
--- a/tests/qemucapabilitiesdata/caps_6.0.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.0.0.aarch64.xml
@@ -191,6 +191,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>6000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.0.0.s390x.xml
b/tests/qemucapabilitiesdata/caps_6.0.0.s390x.xml
index 8fa4cb2307..659d952b08 100644
--- a/tests/qemucapabilitiesdata/caps_6.0.0.s390x.xml
+++ b/tests/qemucapabilitiesdata/caps_6.0.0.s390x.xml
@@ -149,6 +149,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>6000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>39100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
index 70c67202b1..7a2fdde901 100644
--- a/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
@@ -233,6 +233,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>6000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
index a5ec77878f..f8c8266153 100644
--- a/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
@@ -237,6 +237,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>6001000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.2.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_6.2.0.aarch64.xml
index 92d8ceff7e..09f7787797 100644
--- a/tests/qemucapabilitiesdata/caps_6.2.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.2.0.aarch64.xml
@@ -202,6 +202,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>6001050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700244</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.2.0.ppc64.xml
b/tests/qemucapabilitiesdata/caps_6.2.0.ppc64.xml
index f219912927..5c3342d67a 100644
--- a/tests/qemucapabilitiesdata/caps_6.2.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.2.0.ppc64.xml
@@ -198,6 +198,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>6002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900244</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml
index 38fd3878ea..2ce9f7bb6c 100644
--- a/tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml
@@ -239,6 +239,7 @@
<flag name='virtio-iommu-pci'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>6002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100244</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_7.0.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_7.0.0.aarch64.xml
index 522e225c8f..9de4d8bc51 100644
--- a/tests/qemucapabilitiesdata/caps_7.0.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_7.0.0.aarch64.xml
@@ -210,6 +210,7 @@
<flag name='virtio-iommu.boot-bypass'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>6002092</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_7.0.0.ppc64.xml
b/tests/qemucapabilitiesdata/caps_7.0.0.ppc64.xml
index 1eb43799c0..9a0e30b25a 100644
--- a/tests/qemucapabilitiesdata/caps_7.0.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_7.0.0.ppc64.xml
@@ -211,6 +211,7 @@
<flag name='virtio-iommu.boot-bypass'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>6002092</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml
index 82f623883a..14a0ce57ea 100644
--- a/tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml
@@ -243,6 +243,7 @@
<flag name='virtio-iommu.boot-bypass'/>
<flag name='virtio-net.rss'/>
<flag name='migrate-multifd'/>
+ <flag name='migration-param.multifd-compression'/>
<version>6002092</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100243</microcodeVersion>
--
2.34.1
8:11 a.m.
New subject: [libvirt RFCv4 20/20] qemu: add migration parameter multifd-compression
On Wed, Apr 27, 2022 at 11:13:39PM +0200, Claudio Fontana wrote:
use zstd which is the only really interesting one.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/qemu/qemu_capabilities.c | 2 +
src/qemu/qemu_capabilities.h | 1 +
src/qemu/qemu_migration.c | 6 +++
src/qemu/qemu_migration_params.c | 49 +++++++++----------
src/qemu/qemu_migration_params.h | 6 +++
src/qemu/qemu_saveimage.c | 6 +++
.../caps_5.0.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 1 +
.../caps_5.0.0.riscv64.xml | 1 +
.../caps_5.0.0.x86_64.xml | 1 +
.../qemucapabilitiesdata/caps_5.1.0.sparc.xml | 1 +
.../caps_5.1.0.x86_64.xml | 1 +
.../caps_5.2.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_5.2.0.ppc64.xml | 1 +
.../caps_5.2.0.riscv64.xml | 1 +
.../qemucapabilitiesdata/caps_5.2.0.s390x.xml | 1 +
.../caps_5.2.0.x86_64.xml | 1 +
.../caps_6.0.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_6.0.0.s390x.xml | 1 +
.../caps_6.0.0.x86_64.xml | 1 +
.../caps_6.1.0.x86_64.xml | 1 +
.../caps_6.2.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_6.2.0.ppc64.xml | 1 +
.../caps_6.2.0.x86_64.xml | 1 +
.../caps_7.0.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_7.0.0.ppc64.xml | 1 +
.../caps_7.0.0.x86_64.xml | 1 +
27 files changed, 66 insertions(+), 25 deletions(-)
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 7bab913fe5..f9c86de67e 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -5950,6 +5950,12 @@ qemuMigrationSrcToFileAux(virQEMUDriver *driver, virDomainObj
*vm,
QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
nchannels) < 0)
return -1;
+ if (virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION)) {
+ if (qemuMigrationParamsSetString(migParams,
+ QEMU_MIGRATION_PARAM_MULTIFD_COMPRESSION,
+ "zstd") < 0)
+ return -1;
+ }
snip
diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
index 2bc81035ae..a1e9e1c3e8 100644
--- a/src/qemu/qemu_saveimage.c
+++ b/src/qemu/qemu_saveimage.c
@@ -607,6 +607,12 @@ int qemuSaveImageLoadMultiFd(virConnectPtr conn, virDomainObj *vm,
int oflags,
QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
nchannels) < 0)
goto cleanup;
+ if (virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION)) {
+ if (qemuMigrationParamsSetString(migParams,
+ QEMU_MIGRATION_PARAM_MULTIFD_COMPRESSION,
+ "zstd") < 0)
+ goto cleanup;
+ }
if (qemuMigrationParamsApply(driver, vm, asyncJob, migParams) < 0)
goto cleanup;
This is going to break if an image is savd with a QEMU that does not
support zstd, and is later restored with a QEMU that has enabled
zstd.
The current save/restore code supports compression, settable globally
via /etc/libvirt/qemu.conf - raw, gzip, bzip2, xz, lzop.
With your new APIs for save/restore with TypedParameters, we could
make the compression an API driven choice, which would be nice.
Also, we should add zstd to the choices with existing non-parallel
migrate.
When we add parallel migrate, we should wire up whichever options
make sense, but we need to record the use of the compression in the
save image header.
IOW, when loading we only want to use zstd if the original image
header shows use of zstd *and* QEMU supports it.
So I'd suggest we want 3 patches. One for adding zstd as a choice,
one of making compression tunable fvia the APIs, and finally one
for parallel migrate. We don';t have to support all algorithms
with parallel migrate - we can do just a subset that make sense
or are possible.
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
9:28 a.m.
New subject: [libvirt RFCv4 20/20] qemu: add migration parameter multifd-compression
On 4/28/22 3:11 PM, Daniel P. Berrangé wrote:
On Wed, Apr 27, 2022 at 11:13:39PM +0200, Claudio Fontana wrote:
> use zstd which is the only really interesting one.
>
> Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
> ---
> src/qemu/qemu_capabilities.c | 2 +
> src/qemu/qemu_capabilities.h | 1 +
> src/qemu/qemu_migration.c | 6 +++
> src/qemu/qemu_migration_params.c | 49 +++++++++----------
> src/qemu/qemu_migration_params.h | 6 +++
> src/qemu/qemu_saveimage.c | 6 +++
> .../caps_5.0.0.aarch64.xml | 1 +
> .../qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 1 +
> .../caps_5.0.0.riscv64.xml | 1 +
> .../caps_5.0.0.x86_64.xml | 1 +
> .../qemucapabilitiesdata/caps_5.1.0.sparc.xml | 1 +
> .../caps_5.1.0.x86_64.xml | 1 +
> .../caps_5.2.0.aarch64.xml | 1 +
> .../qemucapabilitiesdata/caps_5.2.0.ppc64.xml | 1 +
> .../caps_5.2.0.riscv64.xml | 1 +
> .../qemucapabilitiesdata/caps_5.2.0.s390x.xml | 1 +
> .../caps_5.2.0.x86_64.xml | 1 +
> .../caps_6.0.0.aarch64.xml | 1 +
> .../qemucapabilitiesdata/caps_6.0.0.s390x.xml | 1 +
> .../caps_6.0.0.x86_64.xml | 1 +
> .../caps_6.1.0.x86_64.xml | 1 +
> .../caps_6.2.0.aarch64.xml | 1 +
> .../qemucapabilitiesdata/caps_6.2.0.ppc64.xml | 1 +
> .../caps_6.2.0.x86_64.xml | 1 +
> .../caps_7.0.0.aarch64.xml | 1 +
> .../qemucapabilitiesdata/caps_7.0.0.ppc64.xml | 1 +
> .../caps_7.0.0.x86_64.xml | 1 +
> 27 files changed, 66 insertions(+), 25 deletions(-)
> diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
> index 7bab913fe5..f9c86de67e 100644
> --- a/src/qemu/qemu_migration.c
> +++ b/src/qemu/qemu_migration.c
> @@ -5950,6 +5950,12 @@ qemuMigrationSrcToFileAux(virQEMUDriver *driver, virDomainObj
*vm,
> QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
> nchannels) < 0)
> return -1;
> + if (virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION)) {
> + if (qemuMigrationParamsSetString(migParams,
> +
QEMU_MIGRATION_PARAM_MULTIFD_COMPRESSION,
> + "zstd") < 0)
> + return -1;
> + }
snip
> diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
> index 2bc81035ae..a1e9e1c3e8 100644
> --- a/src/qemu/qemu_saveimage.c
> +++ b/src/qemu/qemu_saveimage.c
> @@ -607,6 +607,12 @@ int qemuSaveImageLoadMultiFd(virConnectPtr conn, virDomainObj
*vm, int oflags,
> QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
> nchannels) < 0)
> goto cleanup;
> + if (virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION)) {
> + if (qemuMigrationParamsSetString(migParams,
> +
QEMU_MIGRATION_PARAM_MULTIFD_COMPRESSION,
> + "zstd") < 0)
> + goto cleanup;
> + }
> if (qemuMigrationParamsApply(driver, vm, asyncJob, migParams) < 0)
> goto cleanup;
>
This is going to break if an image is savd with a QEMU that does not
support zstd, and is later restored with a QEMU that has enabled
zstd.
The current save/restore code supports compression, settable globally
via /etc/libvirt/qemu.conf - raw, gzip, bzip2, xz, lzop.
With your new APIs for save/restore with TypedParameters, we could
make the compression an API driven choice, which would be nice.
Also, we should add zstd to the choices with existing non-parallel
migrate.
When we add parallel migrate, we should wire up whichever options
make sense, but we need to record the use of the compression in the
save image header.
IOW, when loading we only want to use zstd if the original image
header shows use of zstd *and* QEMU supports it.
So I'd suggest we want 3 patches. One for adding zstd as a choice,
one of making compression tunable fvia the APIs, and finally one
for parallel migrate. We don';t have to support all algorithms
with parallel migrate - we can do just a subset that make sense
or are possible.
With regards,
Daniel
of course agree with the overall comments,
just wanted to add that the only practical thing that is useful for multifd-compression
(which is a completely separate parameter from the normal QEMU migration compression
parameter), seems to be "zstd",
likely using the default zstd multifd compression level (1), but likely Dave will correct
me.
Thanks,
Claudio
11:27 a.m.
New subject: [libvirt RFCv4 20/20] qemu: add migration parameter multifd-compression
On Thu, Apr 28, 2022 at 04:28:22PM +0200, Claudio Fontana wrote:
On 4/28/22 3:11 PM, Daniel P. Berrangé wrote:
> On Wed, Apr 27, 2022 at 11:13:39PM +0200, Claudio Fontana wrote:
>> use zstd which is the only really interesting one.
>>
>> Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
>> ---
>> src/qemu/qemu_capabilities.c | 2 +
>> src/qemu/qemu_capabilities.h | 1 +
>> src/qemu/qemu_migration.c | 6 +++
>> src/qemu/qemu_migration_params.c | 49 +++++++++----------
>> src/qemu/qemu_migration_params.h | 6 +++
>> src/qemu/qemu_saveimage.c | 6 +++
>> .../caps_5.0.0.aarch64.xml | 1 +
>> .../qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 1 +
>> .../caps_5.0.0.riscv64.xml | 1 +
>> .../caps_5.0.0.x86_64.xml | 1 +
>> .../qemucapabilitiesdata/caps_5.1.0.sparc.xml | 1 +
>> .../caps_5.1.0.x86_64.xml | 1 +
>> .../caps_5.2.0.aarch64.xml | 1 +
>> .../qemucapabilitiesdata/caps_5.2.0.ppc64.xml | 1 +
>> .../caps_5.2.0.riscv64.xml | 1 +
>> .../qemucapabilitiesdata/caps_5.2.0.s390x.xml | 1 +
>> .../caps_5.2.0.x86_64.xml | 1 +
>> .../caps_6.0.0.aarch64.xml | 1 +
>> .../qemucapabilitiesdata/caps_6.0.0.s390x.xml | 1 +
>> .../caps_6.0.0.x86_64.xml | 1 +
>> .../caps_6.1.0.x86_64.xml | 1 +
>> .../caps_6.2.0.aarch64.xml | 1 +
>> .../qemucapabilitiesdata/caps_6.2.0.ppc64.xml | 1 +
>> .../caps_6.2.0.x86_64.xml | 1 +
>> .../caps_7.0.0.aarch64.xml | 1 +
>> .../qemucapabilitiesdata/caps_7.0.0.ppc64.xml | 1 +
>> .../caps_7.0.0.x86_64.xml | 1 +
>> 27 files changed, 66 insertions(+), 25 deletions(-)
>
>
>> diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
>> index 7bab913fe5..f9c86de67e 100644
>> --- a/src/qemu/qemu_migration.c
>> +++ b/src/qemu/qemu_migration.c
>> @@ -5950,6 +5950,12 @@ qemuMigrationSrcToFileAux(virQEMUDriver *driver,
virDomainObj *vm,
>> QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
>> nchannels) < 0)
>> return -1;
>> + if (virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION)) {
>> + if (qemuMigrationParamsSetString(migParams,
>> +
QEMU_MIGRATION_PARAM_MULTIFD_COMPRESSION,
>> + "zstd") < 0)
>> + return -1;
>> + }
>
> snip
>
>> diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
>> index 2bc81035ae..a1e9e1c3e8 100644
>> --- a/src/qemu/qemu_saveimage.c
>> +++ b/src/qemu/qemu_saveimage.c
>> @@ -607,6 +607,12 @@ int qemuSaveImageLoadMultiFd(virConnectPtr conn,
virDomainObj *vm, int oflags,
>> QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
>> nchannels) < 0)
>> goto cleanup;
>> + if (virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION)) {
>> + if (qemuMigrationParamsSetString(migParams,
>> +
QEMU_MIGRATION_PARAM_MULTIFD_COMPRESSION,
>> + "zstd") < 0)
>> + goto cleanup;
>> + }
>> if (qemuMigrationParamsApply(driver, vm, asyncJob, migParams) < 0)
>> goto cleanup;
>>
>
> This is going to break if an image is savd with a QEMU that does not
> support zstd, and is later restored with a QEMU that has enabled
> zstd.
>
> The current save/restore code supports compression, settable globally
> via /etc/libvirt/qemu.conf - raw, gzip, bzip2, xz, lzop.
>
> With your new APIs for save/restore with TypedParameters, we could
> make the compression an API driven choice, which would be nice.
>
> Also, we should add zstd to the choices with existing non-parallel
> migrate.
>
> When we add parallel migrate, we should wire up whichever options
> make sense, but we need to record the use of the compression in the
> save image header.
>
> IOW, when loading we only want to use zstd if the original image
> header shows use of zstd *and* QEMU supports it.
>
> So I'd suggest we want 3 patches. One for adding zstd as a choice,
> one of making compression tunable fvia the APIs, and finally one
> for parallel migrate. We don';t have to support all algorithms
> with parallel migrate - we can do just a subset that make sense
> or are possible.
>
> With regards,
> Daniel
>
of course agree with the overall comments,
just wanted to add that the only practical thing that is useful for multifd-compression
(which is a completely separate parameter from the normal QEMU migration compression
parameter), seems to be "zstd",
likely using the default zstd multifd compression level (1), but likely Dave will correct
me.
For now.... We've seen enough new compression algorithms that I'm not
going to bet on zstd being the last and/or best forever :-)
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
8:47 a.m.
New subject: [libvirt RFCv4 20/20] qemu: add migration parameter multifd-compression
On 4/28/22 6:27 PM, Daniel P. Berrangé wrote:
On Thu, Apr 28, 2022 at 04:28:22PM +0200, Claudio Fontana wrote:
> On 4/28/22 3:11 PM, Daniel P. Berrangé wrote:
>> On Wed, Apr 27, 2022 at 11:13:39PM +0200, Claudio Fontana wrote:
>>> use zstd which is the only really interesting one.
>>>
>>> Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
>>> ---
>>> src/qemu/qemu_capabilities.c | 2 +
>>> src/qemu/qemu_capabilities.h | 1 +
>>> src/qemu/qemu_migration.c | 6 +++
>>> src/qemu/qemu_migration_params.c | 49 +++++++++----------
>>> src/qemu/qemu_migration_params.h | 6 +++
>>> src/qemu/qemu_saveimage.c | 6 +++
>>> .../caps_5.0.0.aarch64.xml | 1 +
>>> .../qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 1 +
>>> .../caps_5.0.0.riscv64.xml | 1 +
>>> .../caps_5.0.0.x86_64.xml | 1 +
>>> .../qemucapabilitiesdata/caps_5.1.0.sparc.xml | 1 +
>>> .../caps_5.1.0.x86_64.xml | 1 +
>>> .../caps_5.2.0.aarch64.xml | 1 +
>>> .../qemucapabilitiesdata/caps_5.2.0.ppc64.xml | 1 +
>>> .../caps_5.2.0.riscv64.xml | 1 +
>>> .../qemucapabilitiesdata/caps_5.2.0.s390x.xml | 1 +
>>> .../caps_5.2.0.x86_64.xml | 1 +
>>> .../caps_6.0.0.aarch64.xml | 1 +
>>> .../qemucapabilitiesdata/caps_6.0.0.s390x.xml | 1 +
>>> .../caps_6.0.0.x86_64.xml | 1 +
>>> .../caps_6.1.0.x86_64.xml | 1 +
>>> .../caps_6.2.0.aarch64.xml | 1 +
>>> .../qemucapabilitiesdata/caps_6.2.0.ppc64.xml | 1 +
>>> .../caps_6.2.0.x86_64.xml | 1 +
>>> .../caps_7.0.0.aarch64.xml | 1 +
>>> .../qemucapabilitiesdata/caps_7.0.0.ppc64.xml | 1 +
>>> .../caps_7.0.0.x86_64.xml | 1 +
>>> 27 files changed, 66 insertions(+), 25 deletions(-)
>>
>>
>>> diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
>>> index 7bab913fe5..f9c86de67e 100644
>>> --- a/src/qemu/qemu_migration.c
>>> +++ b/src/qemu/qemu_migration.c
>>> @@ -5950,6 +5950,12 @@ qemuMigrationSrcToFileAux(virQEMUDriver *driver,
virDomainObj *vm,
>>>
QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
>>> nchannels) < 0)
>>> return -1;
>>> + if (virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION)) {
>>> + if (qemuMigrationParamsSetString(migParams,
>>> +
QEMU_MIGRATION_PARAM_MULTIFD_COMPRESSION,
>>> + "zstd") < 0)
>>> + return -1;
>>> + }
>>
>> snip
>>
>>> diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
>>> index 2bc81035ae..a1e9e1c3e8 100644
>>> --- a/src/qemu/qemu_saveimage.c
>>> +++ b/src/qemu/qemu_saveimage.c
>>> @@ -607,6 +607,12 @@ int qemuSaveImageLoadMultiFd(virConnectPtr conn,
virDomainObj *vm, int oflags,
>>>
QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS,
>>> nchannels) < 0)
>>> goto cleanup;
>>> + if (virQEMUCapsGet(priv->qemuCaps,
QEMU_CAPS_MIGRATION_PARAM_MULTIFD_COMPRESSION)) {
>>> + if (qemuMigrationParamsSetString(migParams,
>>> +
QEMU_MIGRATION_PARAM_MULTIFD_COMPRESSION,
>>> + "zstd") < 0)
>>> + goto cleanup;
>>> + }
>>> if (qemuMigrationParamsApply(driver, vm, asyncJob, migParams) <
0)
>>> goto cleanup;
>>>
>>
>> This is going to break if an image is savd with a QEMU that does not
>> support zstd, and is later restored with a QEMU that has enabled
>> zstd.
>>
>> The current save/restore code supports compression, settable globally
>> via /etc/libvirt/qemu.conf - raw, gzip, bzip2, xz, lzop.
>>
>> With your new APIs for save/restore with TypedParameters, we could
>> make the compression an API driven choice, which would be nice.
>>
>> Also, we should add zstd to the choices with existing non-parallel
>> migrate.
>>
>> When we add parallel migrate, we should wire up whichever options
>> make sense, but we need to record the use of the compression in the
>> save image header.
>>
>> IOW, when loading we only want to use zstd if the original image
>> header shows use of zstd *and* QEMU supports it.
>>
>> So I'd suggest we want 3 patches. One for adding zstd as a choice,
>> one of making compression tunable fvia the APIs, and finally one
>> for parallel migrate. We don';t have to support all algorithms
>> with parallel migrate - we can do just a subset that make sense
>> or are possible.
>>
>> With regards,
>> Daniel
>>
>
> of course agree with the overall comments,
>
> just wanted to add that the only practical thing that is useful for
multifd-compression
> (which is a completely separate parameter from the normal QEMU migration compression
parameter), seems to be "zstd",
>
> likely using the default zstd multifd compression level (1), but likely Dave will
correct me.
For now.... We've seen enough new compression algorithms that I'm not
going to bet on zstd being the last and/or best forever :-)
With regards,
Daniel
Yes of course, I'll work on this,
if that's ok in the next-next spin, so I can first iron out the initial patches that
are more ripe for upstreaming.
Thanks,
Claudio
968
days inactive
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participants (2)
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Daniel P. Berrangé