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qemu: Refresh state after restore from a save image

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When restoring a domain from a save image, we need to query QEMU
for some runtime information that is not stored in status XML, or
even if it is, it's not parsed (e.g. virtio-mem actual size, or
soon rx-filters for macvtaps).

During migration, this is done in qemuMigrationDstFinishFresh(),
or in case of newly started domain in qemuProcessStart(). Except,
the way that the code is written, when restoring from a save
image (which is effectively a migration), the state is never
refreshed, because qemuProcessStart() sees incoming migration so
it does not refresh the state thinking it'll be done in the
finish phase. But restoring from a save image has no finish
phase. Therefore, refresh the state explicitly after the domain
was restored but before vCPUs are resumed.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Michal Privoznik 2022-10-18 09:44:54 +02:00
parent 43973de6f1
commit 7356dce2b3
1 changed files with 2 additions and 0 deletions
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2
src/qemu/qemu_saveimage.c
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@ -672,6 +672,8 @@ qemuSaveImageStartVM(virConnectPtr conn,
VIR_DOMAIN_EVENT_STARTED_RESTORED);
virObjectEventStateQueue(driver->domainEventState, event);
if (qemuProcessRefreshState(driver, vm, asyncJob) < 0)
goto cleanup;
/* If it was running before, resume it now unless caller requested pause. */
if (header->was_running && !start_paused) {