8:26 a.m.
Diff to v1 [1]:
- fix mistake of dropping hunk that starts CPUs if snapshot was
not successful. We still need it if halt upon snapshot is requested.
The is series is mostly about the first patch. The others patch are
minor cleanups.
[1] v1 version
https://listman.redhat.com/archives/libvir-list/2022-March/229437.html
Maxim Nestratov (1):
qemu: don't pause vm when creating internal snapshot
Nikolay Shirokovskiy (2):
qemu: remove excessive check in qemuSnapshotCreateActiveInternal
qemu: remove unnecessary gotos in qemuSnapshotCreateActiveInternal
src/qemu/qemu_snapshot.c | 24 +++++++-----------------
1 file changed, 7 insertions(+), 17 deletions(-)
--
2.35.1
8:26 a.m.
New subject: [PATCH v2 1/3] qemu: don't pause vm when creating internal snapshot
From: Maxim Nestratov <mnestratov(a)virtuozzo.com>
The pause was introduced in [1] in ancient times when probably distro's
QEMU does not have RESUME event. Yet the event was in the upstream QEMU at
the time version according to [2].
So the event is supported since QEMU version 0.13 which is much older
then oldest currently supported 2.11.0 version and we can remove manual
pause/resume. Except for the halt case.
[1] commit 346236fea97602e9e6529c5d41a32ed26b126082
Author: Jiri Denemark <jdenemar(a)redhat.com>
Date: Thu Feb 24 16:46:44 2011 +0100
qemu: Stop guest CPUs before creating a snapshot
commit 6ed2c484f261fd8bd217f855b9e5e5f981e63f0a
Author: Luiz Capitulino <lcapitulino(a)redhat.com>
Date: Tue Apr 27 20:35:59 2010 -0300
QMP: Introduce RESUME event
Signed-off-by: Nikolay Shirokovskiy <nikolay.shirokovskiy(a)openvz.org>
---
src/qemu/qemu_snapshot.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c
index a7901779fc..cd94ddae24 100644
--- a/src/qemu/qemu_snapshot.c
+++ b/src/qemu/qemu_snapshot.c
@@ -293,16 +293,13 @@ qemuSnapshotCreateActiveInternal(virQEMUDriver *driver,
virObjectEvent *event = NULL;
bool resume = false;
virDomainSnapshotDef *snapdef = virDomainSnapshotObjGetDef(snap);
+ bool halt = !!(flags & VIR_DOMAIN_SNAPSHOT_CREATE_HALT);
int ret = -1;
if (!qemuMigrationSrcIsAllowed(driver, vm, false, 0))
goto cleanup;
- if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_RUNNING) {
- /* savevm monitor command pauses the domain emitting an event which
- * confuses libvirt since it's not notified when qemu resumes the
- * domain. Thus we stop and start CPUs ourselves.
- */
+ if (halt) {
if (qemuProcessStopCPUs(driver, vm, VIR_DOMAIN_PAUSED_SAVE,
QEMU_ASYNC_JOB_SNAPSHOT) < 0)
goto cleanup;
@@ -329,7 +326,7 @@ qemuSnapshotCreateActiveInternal(virQEMUDriver *driver,
if (!(snapdef->cookie = (virObject *) qemuDomainSaveCookieNew(vm)))
goto cleanup;
- if (flags & VIR_DOMAIN_SNAPSHOT_CREATE_HALT) {
+ if (halt) {
event = virDomainEventLifecycleNewFromObj(vm, VIR_DOMAIN_EVENT_STOPPED,
VIR_DOMAIN_EVENT_STOPPED_FROM_SNAPSHOT);
qemuProcessStop(driver, vm, VIR_DOMAIN_SHUTOFF_FROM_SNAPSHOT,
--
2.35.1
8:26 a.m.
New subject: [PATCH v2 2/3] qemu: remove excessive check in qemuSnapshotCreateActiveInternal
After [1] it is not possible to get inactive state for domain while
communicating with QEMU (see also [2]).
Also even if it were possible the qemuProcessStopCPUs would return error
and the check would not be reached.
[1] commit 81f50cb92d16643bcd749e3ab5b404b8b7cec643
Author: Jiri Denemark <jdenemar(a)redhat.com>
Date: Thu Feb 11 11:20:28 2016 +0100
qemu: Avoid calling qemuProcessStop without a job
[2] commit f1ea5bd506b6e00aa8bf55940b147d3c0fe7f124
Author: Ján Tomko <jtomko(a)redhat.com>
Date: Wed Nov 24 13:41:09 2021 +0100
qemu: turn qemuDomainObjExitMonitor into void
Signed-off-by: Nikolay Shirokovskiy <nikolay.shirokovskiy(a)openvz.org>
---
src/qemu/qemu_snapshot.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c
index cd94ddae24..540fda4854 100644
--- a/src/qemu/qemu_snapshot.c
+++ b/src/qemu/qemu_snapshot.c
@@ -305,11 +305,6 @@ qemuSnapshotCreateActiveInternal(virQEMUDriver *driver,
goto cleanup;
resume = true;
- if (!virDomainObjIsActive(vm)) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("guest unexpectedly quit"));
- goto cleanup;
- }
}
if (qemuDomainObjEnterMonitorAsync(driver, vm,
--
2.35.1
8:26 a.m.
New subject: [PATCH v2 3/3] qemu: remove unnecessary gotos in qemuSnapshotCreateActiveInternal
Signed-off-by: Nikolay Shirokovskiy <nikolay.shirokovskiy(a)openvz.org>
---
src/qemu/qemu_snapshot.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c
index 540fda4854..c23fb40849 100644
--- a/src/qemu/qemu_snapshot.c
+++ b/src/qemu/qemu_snapshot.c
@@ -297,21 +297,19 @@ qemuSnapshotCreateActiveInternal(virQEMUDriver *driver,
int ret = -1;
if (!qemuMigrationSrcIsAllowed(driver, vm, false, 0))
- goto cleanup;
+ return -1;
if (halt) {
if (qemuProcessStopCPUs(driver, vm, VIR_DOMAIN_PAUSED_SAVE,
QEMU_ASYNC_JOB_SNAPSHOT) < 0)
- goto cleanup;
+ return -1;
resume = true;
}
if (qemuDomainObjEnterMonitorAsync(driver, vm,
- QEMU_ASYNC_JOB_SNAPSHOT) < 0) {
- resume = false;
- goto cleanup;
- }
+ QEMU_ASYNC_JOB_SNAPSHOT) < 0)
+ return -1;
ret = qemuMonitorCreateSnapshot(priv->mon, snap->def->name);
qemuDomainObjExitMonitor(driver, vm);
--
2.35.1
1005
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1005
days old
3 comments
1 participants
participants (1)
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Nikolay Shirokovskiy