9:11 a.m.
Recently I've added code that aborts migration in case of I/O error. This may
not be desirable as qemu does actually support such migration. This series adds
a flag that enables this option that will be now disabled by default.
Peter Krempa (2):
migration: Make erroring out on I/O error controllable by flag
migration: Don't propagate VIR_MIGRATE_ABORT_ON_ERROR
include/libvirt/libvirt.h.in | 1 +
src/libvirt.c | 17 +++++++++++------
src/qemu/qemu_driver.c | 4 ++--
src/qemu/qemu_migration.c | 39 ++++++++++++++++++++++++---------------
src/qemu/qemu_migration.h | 6 ++++--
tools/virsh-domain.c | 7 +++++++
tools/virsh.pod | 6 ++++--
7 files changed, 53 insertions(+), 27 deletions(-)
--
1.8.2.1
9:11 a.m.
New subject: [libvirt] [PATCH 1/2] migration: Make erroring out on I/O error controllable by flag
Paolo Bonzini pointed out that it's actually possible to migrate a qemu
instance that was paused due to I/O error and it will be able to work on
the destination if the storage is accessible.
This patch introduces flag VIR_MIGRATE_ABORT_ON_ERROR that cancels the
migration in case an I/O error happens while it's being performed and
allows migration without this flag. This flag can be possibly used for
other error reasons that may be introduced in the future.
---
include/libvirt/libvirt.h.in | 1 +
src/qemu/qemu_driver.c | 4 ++--
src/qemu/qemu_migration.c | 23 ++++++++++++++---------
src/qemu/qemu_migration.h | 6 ++++--
tools/virsh-domain.c | 7 +++++++
tools/virsh.pod | 6 ++++--
6 files changed, 32 insertions(+), 15 deletions(-)
diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index 574b970..bd75e1d 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -1188,6 +1188,7 @@ typedef enum {
VIR_MIGRATE_UNSAFE = (1 << 9), /* force migration even if it is
considered unsafe */
VIR_MIGRATE_OFFLINE = (1 << 10), /* offline migrate */
VIR_MIGRATE_COMPRESSED = (1 << 11), /* compress data during migration
*/
+ VIR_MIGRATE_ABORT_ON_ERROR = (1 << 12), /* abort migration on I/O errors
happened during migration */
} virDomainMigrateFlags;
/* Domain migration. */
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index c886378..4b23bc3 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -2819,7 +2819,7 @@ qemuDomainSaveInternal(virQEMUDriverPtr driver, virDomainPtr dom,
if (!(caps = virQEMUDriverGetCapabilities(driver, false)))
goto cleanup;
- if (!qemuMigrationIsAllowed(driver, vm, vm->def, false))
+ if (!qemuMigrationIsAllowed(driver, vm, vm->def, false, false))
goto cleanup;
if (qemuDomainObjBeginAsyncJob(driver, vm,
@@ -11663,7 +11663,7 @@ qemuDomainSnapshotCreateActiveExternal(virConnectPtr conn,
/* do the memory snapshot if necessary */
if (memory) {
/* check if migration is possible */
- if (!qemuMigrationIsAllowed(driver, vm, vm->def, false))
+ if (!qemuMigrationIsAllowed(driver, vm, vm->def, false, false))
goto endjob;
/* allow the migration job to be cancelled or the domain to be paused */
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 48e0d44..281467b 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -1420,7 +1420,7 @@ cleanup:
* the fact that older servers did not do checks on the source. */
bool
qemuMigrationIsAllowed(virQEMUDriverPtr driver, virDomainObjPtr vm,
- virDomainDefPtr def, bool remote)
+ virDomainDefPtr def, bool remote, bool abort_on_error)
{
int nsnapshots;
int pauseReason;
@@ -1448,7 +1448,8 @@ qemuMigrationIsAllowed(virQEMUDriverPtr driver, virDomainObjPtr vm,
}
/* cancel migration if disk I/O error is emitted while migrating */
- if (virDomainObjGetState(vm, &pauseReason) == VIR_DOMAIN_PAUSED
&&
+ if (abort_on_error &&
+ virDomainObjGetState(vm, &pauseReason) == VIR_DOMAIN_PAUSED
&&
pauseReason == VIR_DOMAIN_PAUSED_IOERROR) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("cannot migrate domain with I/O error"));
@@ -1692,7 +1693,7 @@ qemuMigrationUpdateJobStatus(virQEMUDriverPtr driver,
static int
qemuMigrationWaitForCompletion(virQEMUDriverPtr driver, virDomainObjPtr vm,
enum qemuDomainAsyncJob asyncJob,
- virConnectPtr dconn)
+ virConnectPtr dconn, bool abort_on_error)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
const char *job;
@@ -1719,7 +1720,7 @@ qemuMigrationWaitForCompletion(virQEMUDriverPtr driver,
virDomainObjPtr vm,
struct timespec ts = { .tv_sec = 0, .tv_nsec = 50 * 1000 * 1000ull };
/* cancel migration if disk I/O error is emitted while migrating */
- if (priv->job.asyncJob == QEMU_ASYNC_JOB_MIGRATION_OUT &&
+ if (abort_on_error &&
virDomainObjGetState(vm, &pauseReason) == VIR_DOMAIN_PAUSED &&
pauseReason == VIR_DOMAIN_PAUSED_IOERROR)
goto cancel;
@@ -1920,6 +1921,7 @@ char *qemuMigrationBegin(virQEMUDriverPtr driver,
qemuDomainObjPrivatePtr priv = vm->privateData;
virCapsPtr caps = NULL;
unsigned int cookieFlags = QEMU_MIGRATION_COOKIE_LOCKSTATE;
+ bool abort_on_error = !!(flags & VIR_MIGRATE_ABORT_ON_ERROR);
VIR_DEBUG("driver=%p, vm=%p, xmlin=%s, dname=%s,"
" cookieout=%p, cookieoutlen=%p, flags=%lx",
@@ -1936,7 +1938,7 @@ char *qemuMigrationBegin(virQEMUDriverPtr driver,
if (priv->job.asyncJob == QEMU_ASYNC_JOB_MIGRATION_OUT)
qemuMigrationJobSetPhase(driver, vm, QEMU_MIGRATION_PHASE_BEGIN3);
- if (!qemuMigrationIsAllowed(driver, vm, NULL, true))
+ if (!qemuMigrationIsAllowed(driver, vm, NULL, true, abort_on_error))
goto cleanup;
if (!(flags & VIR_MIGRATE_UNSAFE) && !qemuMigrationIsSafe(vm->def))
@@ -2052,6 +2054,7 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
virCapsPtr caps = NULL;
const char *listenAddr = NULL;
char *migrateFrom = NULL;
+ bool abort_on_error = !!(flags & VIR_MIGRATE_ABORT_ON_ERROR);
if (virTimeMillisNow(&now) < 0)
return -1;
@@ -2081,7 +2084,7 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
if (!(caps = virQEMUDriverGetCapabilities(driver, false)))
goto cleanup;
- if (!qemuMigrationIsAllowed(driver, NULL, *def, true))
+ if (!qemuMigrationIsAllowed(driver, NULL, *def, true, abort_on_error))
goto cleanup;
/* Let migration hook filter domain XML */
@@ -2777,6 +2780,7 @@ qemuMigrationRun(virQEMUDriverPtr driver,
unsigned long migrate_speed = resource ? resource : priv->migMaxBandwidth;
virErrorPtr orig_err = NULL;
unsigned int cookieFlags = 0;
+ bool abort_on_error = !!(flags & VIR_MIGRATE_ABORT_ON_ERROR);
VIR_DEBUG("driver=%p, vm=%p, cookiein=%s, cookieinlen=%d, "
"cookieout=%p, cookieoutlen=%p, flags=%lx, resource=%lu, "
@@ -2929,7 +2933,7 @@ qemuMigrationRun(virQEMUDriverPtr driver,
if (qemuMigrationWaitForCompletion(driver, vm,
QEMU_ASYNC_JOB_MIGRATION_OUT,
- dconn) < 0)
+ dconn, abort_on_error) < 0)
goto cleanup;
/* When migration completed, QEMU will have paused the
@@ -3610,6 +3614,7 @@ qemuMigrationPerformJob(virQEMUDriverPtr driver,
int resume = 0;
virErrorPtr orig_err = NULL;
virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
+ bool abort_on_error = !!(flags & VIR_MIGRATE_ABORT_ON_ERROR);
if (qemuMigrationJobStart(driver, vm, QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
goto cleanup;
@@ -3620,7 +3625,7 @@ qemuMigrationPerformJob(virQEMUDriverPtr driver,
goto endjob;
}
- if (!qemuMigrationIsAllowed(driver, vm, NULL, true))
+ if (!qemuMigrationIsAllowed(driver, vm, NULL, true, abort_on_error))
goto endjob;
if (!(flags & VIR_MIGRATE_UNSAFE) && !qemuMigrationIsSafe(vm->def))
@@ -4316,7 +4321,7 @@ qemuMigrationToFile(virQEMUDriverPtr driver, virDomainObjPtr vm,
if (rc < 0)
goto cleanup;
- rc = qemuMigrationWaitForCompletion(driver, vm, asyncJob, NULL);
+ rc = qemuMigrationWaitForCompletion(driver, vm, asyncJob, NULL, false);
if (rc < 0)
goto cleanup;
diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h
index 22b04b4..5b21ca2 100644
--- a/src/qemu/qemu_migration.h
+++ b/src/qemu/qemu_migration.h
@@ -38,7 +38,8 @@
VIR_MIGRATE_CHANGE_PROTECTION | \
VIR_MIGRATE_UNSAFE | \
VIR_MIGRATE_OFFLINE | \
- VIR_MIGRATE_COMPRESSED)
+ VIR_MIGRATE_COMPRESSED | \
+ VIR_MIGRATE_ABORT_ON_ERROR)
enum qemuMigrationJobPhase {
QEMU_MIGRATION_PHASE_NONE = 0,
@@ -147,7 +148,8 @@ int qemuMigrationConfirm(virQEMUDriverPtr driver,
int retcode);
bool qemuMigrationIsAllowed(virQEMUDriverPtr driver, virDomainObjPtr vm,
- virDomainDefPtr def, bool remote);
+ virDomainDefPtr def, bool remote,
+ bool abort_on_error);
int qemuMigrationToFile(virQEMUDriverPtr driver, virDomainObjPtr vm,
int fd, off_t offset, const char *path,
diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index 955e882..7f9b9e3 100644
--- a/tools/virsh-domain.c
+++ b/tools/virsh-domain.c
@@ -8306,6 +8306,10 @@ static const vshCmdOptDef opts_migrate[] = {
.type = VSH_OT_BOOL,
.help = N_("compress repeated pages during live migration")
},
+ {.name = "abort-on-error",
+ .type = VSH_OT_BOOL,
+ .help = N_("abort on soft errors during migration")
+ },
{.name = "domain",
.type = VSH_OT_DATA,
.flags = VSH_OFLAG_REQ,
@@ -8399,6 +8403,9 @@ doMigrate(void *opaque)
flags |= VIR_MIGRATE_OFFLINE;
}
+ if (vshCommandOptBool(cmd, "abort-on-error"))
+ flags |= VIR_MIGRATE_ABORT_ON_ERROR;
+
if (xmlfile &&
virFileReadAll(xmlfile, 8192, &xml) < 0) {
vshError(ctl, _("file '%s' doesn't exist"), xmlfile);
diff --git a/tools/virsh.pod b/tools/virsh.pod
index 405b4d2..21367d4 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -1043,7 +1043,8 @@ stats.
=item B<migrate> [I<--live>] [I<--offline>] [I<--direct>]
[I<--p2p> [I<--tunnelled>]]
[I<--persistent>] [I<--undefinesource>] [I<--suspend>]
[I<--copy-storage-all>]
[I<--copy-storage-inc>] [I<--change-protection>] [I<--unsafe>]
[I<--verbose>]
-[I<--compressed>] I<domain> I<desturi> [I<migrateuri>]
[I<dname>]
+[I<--compressed>] [I<--abort-on-error>]
+I<domain> I<desturi> [I<migrateuri>] [I<dname>]
[I<--timeout> B<seconds>] [I<--xml> B<file>]
Migrate domain to another host. Add I<--live> for live migration; <--p2p>
@@ -1066,7 +1067,8 @@ is implicitly enabled when supported by the hypervisor, but can be
explicitly
used to reject the migration if the hypervisor lacks change protection
support. I<--verbose> displays the progress of migration. I<--compressed>
activates compression of memory pages that have to be transferred repeatedly
-during live migration.
+during live migration. I<--abort-on-error> cancels the migration if a soft
+error (for example I/O error) happens during the migration.
B<Note>: Individual hypervisors usually do not support all possible types of
migration. For example, QEMU does not support direct migration.
--
1.8.2.1
9:11 a.m.
New subject: [libvirt] [PATCH 2/2] migration: Don't propagate VIR_MIGRATE_ABORT_ON_ERROR
This flag is meant for errors happening on the source of the migration
and isn't used on the destination. To allow better migration
compatibility, don't propagate it to the destination.
---
src/libvirt.c | 17 +++++++++++------
src/qemu/qemu_migration.c | 16 ++++++++++------
2 files changed, 21 insertions(+), 12 deletions(-)
diff --git a/src/libvirt.c b/src/libvirt.c
index 620dbdd..57e1027 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -4554,6 +4554,8 @@ virDomainMigrateVersion1(virDomainPtr domain,
char *cookie = NULL;
int cookielen = 0, ret;
virDomainInfo info;
+ unsigned int destflags = flags & ~VIR_MIGRATE_ABORT_ON_ERROR;
+
VIR_DOMAIN_DEBUG(domain,
"dconn=%p, flags=%lx, dname=%s, uri=%s, bandwidth=%lu",
dconn, flags, NULLSTR(dname), NULLSTR(uri), bandwidth);
@@ -4575,7 +4577,7 @@ virDomainMigrateVersion1(virDomainPtr domain,
* the URI, it should leave uri_out as NULL.
*/
if (dconn->driver->domainMigratePrepare
- (dconn, &cookie, &cookielen, uri, &uri_out, flags, dname,
+ (dconn, &cookie, &cookielen, uri, &uri_out, destflags, dname,
bandwidth) == -1)
goto done;
@@ -4602,7 +4604,7 @@ virDomainMigrateVersion1(virDomainPtr domain,
dname = dname ? dname : domain->name;
if (dconn->driver->domainMigrateFinish)
ddomain = dconn->driver->domainMigrateFinish
- (dconn, dname, cookie, cookielen, uri, flags);
+ (dconn, dname, cookie, cookielen, uri, destflags);
else
ddomain = virDomainLookupByName(dconn, dname);
@@ -4648,6 +4650,8 @@ virDomainMigrateVersion2(virDomainPtr domain,
virErrorPtr orig_err = NULL;
unsigned int getxml_flags = 0;
int cancelled;
+ unsigned int destflags = flags & ~VIR_MIGRATE_ABORT_ON_ERROR;
+
VIR_DOMAIN_DEBUG(domain,
"dconn=%p, flags=%lx, dname=%s, uri=%s, bandwidth=%lu",
dconn, flags, NULLSTR(dname), NULLSTR(uri), bandwidth);
@@ -4692,7 +4696,7 @@ virDomainMigrateVersion2(virDomainPtr domain,
VIR_DEBUG("Prepare2 %p flags=%lx", dconn, flags);
ret = dconn->driver->domainMigratePrepare2
- (dconn, &cookie, &cookielen, uri, &uri_out, flags, dname,
+ (dconn, &cookie, &cookielen, uri, &uri_out, destflags, dname,
bandwidth, dom_xml);
VIR_FREE(dom_xml);
if (ret == -1)
@@ -4732,7 +4736,7 @@ finish:
dname = dname ? dname : domain->name;
VIR_DEBUG("Finish2 %p ret=%d", dconn, ret);
ddomain = dconn->driver->domainMigrateFinish2
- (dconn, dname, cookie, cookielen, uri, flags, cancelled);
+ (dconn, dname, cookie, cookielen, uri, destflags, cancelled);
done:
if (orig_err) {
@@ -4791,6 +4795,7 @@ virDomainMigrateVersion3(virDomainPtr domain,
int cancelled = 1;
unsigned long protection = 0;
bool notify_source = true;
+ unsigned int destflags = flags & ~VIR_MIGRATE_ABORT_ON_ERROR;
VIR_DOMAIN_DEBUG(domain, "dconn=%p xmlin=%s, flags=%lx, "
"dname=%s, uri=%s, bandwidth=%lu",
@@ -4830,7 +4835,7 @@ virDomainMigrateVersion3(virDomainPtr domain,
cookieoutlen = 0;
ret = dconn->driver->domainMigratePrepare3
(dconn, cookiein, cookieinlen, &cookieout, &cookieoutlen,
- uri, &uri_out, flags, dname, bandwidth, dom_xml);
+ uri, &uri_out, destflags, dname, bandwidth, dom_xml);
VIR_FREE(dom_xml);
if (ret == -1) {
if (protection) {
@@ -4908,7 +4913,7 @@ finish:
dname = dname ? dname : domain->name;
ddomain = dconn->driver->domainMigrateFinish3
(dconn, dname, cookiein, cookieinlen, &cookieout, &cookieoutlen,
- NULL, uri, flags, cancelled);
+ NULL, uri, destflags, cancelled);
/* If ddomain is NULL, then we were unable to start
* the guest on the target, and must restart on the
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 281467b..16c8aac 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -3165,6 +3165,8 @@ static int doPeer2PeerMigrate2(virQEMUDriverPtr driver,
virErrorPtr orig_err = NULL;
bool cancelled;
virStreamPtr st = NULL;
+ unsigned int destflags = flags & ~VIR_MIGRATE_ABORT_ON_ERROR;
+
VIR_DEBUG("driver=%p, sconn=%p, dconn=%p, vm=%p, dconnuri=%s, "
"flags=%lx, dname=%s, resource=%lu",
driver, sconn, dconn, vm, NULLSTR(dconnuri),
@@ -3194,13 +3196,13 @@ static int doPeer2PeerMigrate2(virQEMUDriverPtr driver,
qemuDomainObjEnterRemote(vm);
ret = dconn->driver->domainMigratePrepareTunnel
- (dconn, st, flags, dname, resource, dom_xml);
+ (dconn, st, destflags, dname, resource, dom_xml);
qemuDomainObjExitRemote(vm);
} else {
qemuDomainObjEnterRemote(vm);
ret = dconn->driver->domainMigratePrepare2
(dconn, &cookie, &cookielen, NULL, &uri_out,
- flags, dname, resource, dom_xml);
+ destflags, dname, resource, dom_xml);
qemuDomainObjExitRemote(vm);
}
VIR_FREE(dom_xml);
@@ -3258,7 +3260,7 @@ finish:
qemuDomainObjEnterRemote(vm);
ddomain = dconn->driver->domainMigrateFinish2
(dconn, dname, cookie, cookielen,
- uri_out ? uri_out : dconnuri, flags, cancelled);
+ uri_out ? uri_out : dconnuri, destflags, cancelled);
qemuDomainObjExitRemote(vm);
cleanup:
@@ -3308,6 +3310,8 @@ static int doPeer2PeerMigrate3(virQEMUDriverPtr driver,
virErrorPtr orig_err = NULL;
bool cancelled;
virStreamPtr st = NULL;
+ unsigned int destflags = flags & ~VIR_MIGRATE_ABORT_ON_ERROR;
+
VIR_DEBUG("driver=%p, sconn=%p, dconn=%p, vm=%p, xmlin=%s, "
"dconnuri=%s, uri=%s, flags=%lx, dname=%s, resource=%lu",
driver, sconn, dconn, vm, NULLSTR(xmlin),
@@ -3340,13 +3344,13 @@ static int doPeer2PeerMigrate3(virQEMUDriverPtr driver,
ret = dconn->driver->domainMigratePrepareTunnel3
(dconn, st, cookiein, cookieinlen,
&cookieout, &cookieoutlen,
- flags, dname, resource, dom_xml);
+ destflags, dname, resource, dom_xml);
qemuDomainObjExitRemote(vm);
} else {
qemuDomainObjEnterRemote(vm);
ret = dconn->driver->domainMigratePrepare3
(dconn, cookiein, cookieinlen, &cookieout, &cookieoutlen,
- uri, &uri_out, flags, dname, resource, dom_xml);
+ uri, &uri_out, destflags, dname, resource, dom_xml);
qemuDomainObjExitRemote(vm);
}
VIR_FREE(dom_xml);
@@ -3422,7 +3426,7 @@ finish:
qemuDomainObjEnterRemote(vm);
ddomain = dconn->driver->domainMigrateFinish3
(dconn, dname, cookiein, cookieinlen, &cookieout, &cookieoutlen,
- dconnuri, uri_out ? uri_out : uri, flags, cancelled);
+ dconnuri, uri_out ? uri_out : uri, destflags, cancelled);
qemuDomainObjExitRemote(vm);
/* If ddomain is NULL, then we were unable to start
--
1.8.2.1
5:41 a.m.
On 12.06.2013 16:11, Peter Krempa wrote:
Recently I've added code that aborts migration in case of I/O
error. This may
not be desirable as qemu does actually support such migration. This series adds
a flag that enables this option that will be now disabled by default.
Peter Krempa (2):
migration: Make erroring out on I/O error controllable by flag
migration: Don't propagate VIR_MIGRATE_ABORT_ON_ERROR
include/libvirt/libvirt.h.in | 1 +
src/libvirt.c | 17 +++++++++++------
src/qemu/qemu_driver.c | 4 ++--
src/qemu/qemu_migration.c | 39 ++++++++++++++++++++++++---------------
src/qemu/qemu_migration.h | 6 ++++--
tools/virsh-domain.c | 7 +++++++
tools/virsh.pod | 6 ++++--
7 files changed, 53 insertions(+), 27 deletions(-)
ACK series.
Michal
7:57 a.m.
On Fri, Jun 14, 2013 at 12:41:40 +0200, Michal Privoznik wrote:
On 12.06.2013 16:11, Peter Krempa wrote:
> Recently I've added code that aborts migration in case of I/O error. This may
> not be desirable as qemu does actually support such migration. This series adds
> a flag that enables this option that will be now disabled by default.
>
> Peter Krempa (2):
> migration: Make erroring out on I/O error controllable by flag
> migration: Don't propagate VIR_MIGRATE_ABORT_ON_ERROR
>
> include/libvirt/libvirt.h.in | 1 +
> src/libvirt.c | 17 +++++++++++------
> src/qemu/qemu_driver.c | 4 ++--
> src/qemu/qemu_migration.c | 39 ++++++++++++++++++++++++---------------
> src/qemu/qemu_migration.h | 6 ++++--
> tools/virsh-domain.c | 7 +++++++
> tools/virsh.pod | 6 ++++--
> 7 files changed, 53 insertions(+), 27 deletions(-)
>
ACK series.
I pushed this series.
Jirka
4315
days inactive
4321
days old
4 comments
3 participants
participants (3)
-
Jiri Denemark -
Michal Privoznik -
Peter Krempa