3:03 a.m.
Currently, we use migrate to dump guest's memory. There is one
restriction in migrate command: the device's status should be
stored in qemu because the device's status should be passed to
target machine.
If we passthrough a host device to guest, the device's status
is stored in the real device. So migrate command will fail.
We usually use dump when guest is panicked. So there is no need
to store device's status in the vmcore.
qemu will have a new monitor command dump-guest-memory to dump
guest memory, but it doesn't support async now(it will support
later when the common async API is implemented).
So I use dump-guest-memory only when the guest uses host device
in this patchset.
Note: the patchset for qemu is still queued. Luiz has acked,
but he waits an ACK from Jan and/or Anthony. They are too busy,
and donot reply.
Change from v1 to v2:
1. remove the implemention for text mode.
Wen Congyang (2):
qemu: implement qemu's dump-guest-memory
qemu: try to use qemu's dump-guest-meory when vm uses host device
src/qemu/qemu_domain.c | 1 +
src/qemu/qemu_domain.h | 1 +
src/qemu/qemu_driver.c | 42 ++++++++++++++++++++++++++++++++++++++++--
src/qemu/qemu_monitor.c | 36 ++++++++++++++++++++++++++++++++++++
src/qemu/qemu_monitor.h | 13 +++++++++++++
src/qemu/qemu_monitor_json.c | 42 ++++++++++++++++++++++++++++++++++++++++++
src/qemu/qemu_monitor_json.h | 7 +++++++
7 files changed, 140 insertions(+), 2 deletions(-)
3:45 a.m.
New subject: [libvirt] [PATCH 1/2 v2] qemu: implement qemu's dump-guest-memory
---
src/qemu/qemu_monitor.c | 36 ++++++++++++++++++++++++++++++++++++
src/qemu/qemu_monitor.h | 13 +++++++++++++
src/qemu/qemu_monitor_json.c | 42 ++++++++++++++++++++++++++++++++++++++++++
src/qemu/qemu_monitor_json.h | 7 +++++++
4 files changed, 98 insertions(+), 0 deletions(-)
diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index e1a8d4c..81bdf07 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -2018,6 +2018,42 @@ int qemuMonitorMigrateCancel(qemuMonitorPtr mon)
return ret;
}
+/* Return 0 on success, -1 on failure, or -2 if not supported. */
+int qemuMonitorDumpToFd(qemuMonitorPtr mon,
+ unsigned int flags,
+ int fd,
+ unsigned long long begin,
+ unsigned long long length)
+{
+ int ret;
+ VIR_DEBUG("mon=%p fd=%d flags=%x begin=%llx length=%llx",
+ mon, fd, flags, begin, length);
+
+ if (!mon) {
+ qemuReportError(VIR_ERR_INVALID_ARG, "%s",
+ _("monitor must not be NULL"));
+ return -1;
+ }
+
+ if (!mon->json)
+ /* dump-guest-memory is supported after qemu-1.0, and we always use json
+ * if qemu's version is >= 0.15. So if we use text mode, the qemu is
+ * old, and it does not support dump-guest-memory.
+ */
+ return -2;
+
+ if (qemuMonitorSendFileHandle(mon, "dump", fd) < 0)
+ return -1;
+
+ ret = qemuMonitorJSONDump(mon, flags, "fd:dump", begin, length);
+
+ if (ret < 0) {
+ if (qemuMonitorCloseFileHandle(mon, "dump") < 0)
+ VIR_WARN("failed to close dumping handle");
+ }
+
+ return ret;
+}
int qemuMonitorGraphicsRelocate(qemuMonitorPtr mon,
int type,
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index b480966..315cb9e 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -379,6 +379,19 @@ int qemuMonitorMigrateToUnix(qemuMonitorPtr mon,
int qemuMonitorMigrateCancel(qemuMonitorPtr mon);
+typedef enum {
+ QEMU_MONITOR_DUMP_HAVE_FILTER = 1 << 0,
+ QEMU_MONITOR_DUMP_PAGING = 1 << 1,
+ QEMU_MONITOR_DUMP_FLAGS_LAST
+} QEMU_MONITOR_DUMP;
+
+/* Return 0 on success, -1 on failure, or -2 if not supported. */
+int qemuMonitorDumpToFd(qemuMonitorPtr mon,
+ unsigned int flags,
+ int fd,
+ unsigned long long begin,
+ unsigned long long length);
+
int qemuMonitorGraphicsRelocate(qemuMonitorPtr mon,
int type,
const char *hostname,
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index d09d779..6709abf 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -2419,6 +2419,48 @@ int qemuMonitorJSONMigrateCancel(qemuMonitorPtr mon)
return ret;
}
+/* Return 0 on success, -1 on failure, or -2 if not supported. */
+int qemuMonitorJSONDump(qemuMonitorPtr mon,
+ unsigned int flags,
+ const char *protocol,
+ unsigned long long begin,
+ unsigned long long length)
+{
+ int ret;
+ virJSONValuePtr cmd = NULL;
+ virJSONValuePtr reply = NULL;
+
+ if (flags & QEMU_MONITOR_DUMP_HAVE_FILTER)
+ cmd = qemuMonitorJSONMakeCommand("dump-guest-memory",
+ "b:paging", flags &
QEMU_MONITOR_DUMP_PAGING ? 1 : 0,
+ "s:protocol", protocol,
+ "U:begin", begin,
+ "U:length", length,
+ NULL);
+ else
+ cmd = qemuMonitorJSONMakeCommand("dump-guest-memory",
+ "b:paging", flags &
QEMU_MONITOR_DUMP_PAGING ? 1 : 0,
+ "s:protocol", protocol,
+ NULL);
+ if (!cmd)
+ return -1;
+
+ ret = qemuMonitorJSONCommand(mon, cmd, &reply);
+
+ if (ret == 0) {
+ if (qemuMonitorJSONHasError(reply, "CommandNotFound")) {
+ ret = -2;
+ goto cleanup;
+ }
+
+ ret = qemuMonitorJSONCheckError(cmd, reply);
+ }
+
+cleanup:
+ virJSONValueFree(cmd);
+ virJSONValueFree(reply);
+ return ret;
+}
int qemuMonitorJSONGraphicsRelocate(qemuMonitorPtr mon,
int type,
diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
index a0f67aa..a8b70d4 100644
--- a/src/qemu/qemu_monitor_json.h
+++ b/src/qemu/qemu_monitor_json.h
@@ -136,6 +136,13 @@ int qemuMonitorJSONMigrate(qemuMonitorPtr mon,
int qemuMonitorJSONMigrateCancel(qemuMonitorPtr mon);
+/* Return 0 on success, -1 on failure, or -2 if not supported. */
+int qemuMonitorJSONDump(qemuMonitorPtr mon,
+ unsigned int flags,
+ const char *protocol,
+ unsigned long long begin,
+ unsigned long long length);
+
int qemuMonitorJSONGraphicsRelocate(qemuMonitorPtr mon,
int type,
const char *hostname,
--
1.7.1
3:46 a.m.
New subject: [libvirt] [PATCH 2/2 v2] qemu: try to use qemu's dump-guest-meory when vm uses host device
---
src/qemu/qemu_domain.c | 1 +
src/qemu/qemu_domain.h | 1 +
src/qemu/qemu_driver.c | 42 ++++++++++++++++++++++++++++++++++++++++--
3 files changed, 42 insertions(+), 2 deletions(-)
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 69d9e6e..e3a668a 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -158,6 +158,7 @@ qemuDomainObjResetAsyncJob(qemuDomainObjPrivatePtr priv)
job->phase = 0;
job->mask = DEFAULT_JOB_MASK;
job->start = 0;
+ job->qemu_dump = false;
memset(&job->info, 0, sizeof(job->info));
}
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index adccfed..f1ab0e6 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -97,6 +97,7 @@ struct qemuDomainJobObj {
int phase; /* Job phase (mainly for migrations) */
unsigned long long mask; /* Jobs allowed during async job */
unsigned long long start; /* When the async job started */
+ bool qemu_dump; /* use qemu dump to do dump */
virDomainJobInfo info; /* Async job progress data */
};
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index d9e35be..fb14734 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -2953,6 +2953,31 @@ cleanup:
return ret;
}
+/* Return 0 on success, -1 on failure, or -2 if not supported. */
+static int qemuDumpToFd(struct qemud_driver *driver, virDomainObjPtr vm,
+ int fd, enum qemuDomainAsyncJob asyncJob)
+{
+ qemuDomainObjPrivatePtr priv = vm->privateData;
+ int ret = -1;
+
+ if (!qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_FD))
+ return -2;
+
+ if (virSecurityManagerSetImageFDLabel(driver->securityManager, vm->def,
+ fd) < 0)
+ return -1;
+
+ priv->job.qemu_dump = true;
+
+ if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
+ return -1;
+
+ ret = qemuMonitorDumpToFd(priv->mon, 0, fd, 0, 0);
+ qemuDomainObjExitMonitorWithDriver(driver, vm);
+
+ return ret;
+}
+
static int
doCoreDump(struct qemud_driver *driver,
virDomainObjPtr vm,
@@ -2984,6 +3009,19 @@ doCoreDump(struct qemud_driver *driver,
NULL, NULL)) < 0)
goto cleanup;
+ if (vm->def->nhostdevs > 0) {
+ /*
+ * If the guest uses host devices, migrate command will fail. So we
+ * should use dump command.
+ *
+ * qemu dump does not support fd that is associated with a pipe,
+ * socket, or FIFO. So we should call qemuDumpTpFd() before calling
+ * virFileWrapperFdNew(). */
+ ret = qemuDumpToFd(driver, vm, fd, QEMU_ASYNC_JOB_DUMP);
+ if (ret != -2)
+ goto cleanup;
+ }
+
if (!(wrapperFd = virFileWrapperFdNew(&fd, path, flags)))
goto cleanup;
@@ -9332,7 +9370,7 @@ static int qemuDomainGetJobInfo(virDomainPtr dom,
priv = vm->privateData;
if (virDomainObjIsActive(vm)) {
- if (priv->job.asyncJob) {
+ if (priv->job.asyncJob && !priv->job.qemu_dump) {
memcpy(info, &priv->job.info, sizeof(*info));
/* Refresh elapsed time again just to ensure it
@@ -9390,7 +9428,7 @@ static int qemuDomainAbortJob(virDomainPtr dom) {
priv = vm->privateData;
- if (!priv->job.asyncJob) {
+ if (!priv->job.asyncJob || priv->job.qemu_dump) {
qemuReportError(VIR_ERR_OPERATION_INVALID,
"%s", _("no job is active on the domain"));
goto endjob;
--
1.7.1
2:46 a.m.
New subject: [libvirt] [PATCH 0/2 v2] use qemu's dump-guest-meory when vm uses host device
Hi, Eric
Luiz will accept the qemu's patch:
http://lists.nongnu.org/archive/html/qemu-devel/2012-04/msg02346.html
Do you have any comment about this patchset?
Thanks
Wen Congyang
At 04/10/2012 04:03 PM, Wen Congyang Wrote:
Currently, we use migrate to dump guest's memory. There is one
restriction in migrate command: the device's status should be
stored in qemu because the device's status should be passed to
target machine.
If we passthrough a host device to guest, the device's status
is stored in the real device. So migrate command will fail.
We usually use dump when guest is panicked. So there is no need
to store device's status in the vmcore.
qemu will have a new monitor command dump-guest-memory to dump
guest memory, but it doesn't support async now(it will support
later when the common async API is implemented).
So I use dump-guest-memory only when the guest uses host device
in this patchset.
Note: the patchset for qemu is still queued. Luiz has acked,
but he waits an ACK from Jan and/or Anthony. They are too busy,
and donot reply.
Change from v1 to v2:
1. remove the implemention for text mode.
Wen Congyang (2):
qemu: implement qemu's dump-guest-memory
qemu: try to use qemu's dump-guest-meory when vm uses host device
src/qemu/qemu_domain.c | 1 +
src/qemu/qemu_domain.h | 1 +
src/qemu/qemu_driver.c | 42 ++++++++++++++++++++++++++++++++++++++++--
src/qemu/qemu_monitor.c | 36 ++++++++++++++++++++++++++++++++++++
src/qemu/qemu_monitor.h | 13 +++++++++++++
src/qemu/qemu_monitor_json.c | 42 ++++++++++++++++++++++++++++++++++++++++++
src/qemu/qemu_monitor_json.h | 7 +++++++
7 files changed, 140 insertions(+), 2 deletions(-)
--
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libvir-list(a)redhat.com
https://www.redhat.com/mailman/listinfo/libvir-list
12:26 p.m.
New subject: [libvirt] [PATCH 0/2 v2] use qemu's dump-guest-meory when vm uses host device
On 04/18/2012 01:46 AM, Wen Congyang wrote:
Hi, Eric
Luiz will accept the qemu's patch:
http://lists.nongnu.org/archive/html/qemu-devel/2012-04/msg02346.html
Do you have any comment about this patchset?
Thanks for the ping. It's on my list to review, but I'm hoping to tie
up work on my live storage migration work first, so it will probably be
Monday or Tuesday before I can get to your series. Maybe we'll get
lucky with someone else volunteering some review time?
--
Eric Blake eblake(a)redhat.com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
4630
days inactive
4639
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4 comments
2 participants
participants (2)
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Eric Blake -
Wen Congyang