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qemu: Enable migration events only for fresh QEMU process

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Every running QEMU process we are willing to reconnect (i.e., at least
3.1.0) supports migration events and we can assume the capability is
already enabled since last time libvirt daemon connected to its monitor.

Well, it's not guaranteed though. If libvirt 1.2.17 or older was used to
start QEMU 3.1.0 or newer, migration events would not be enabled. And if
the user decides to upgrade libvirt from 1.2.17 to 8.4.0 while the QEMU
process is still running, they would not be able to migrate the domain
because of disabled migration events. I think we do not really need to
worry about this scenario as libvirt 1.2.17 is 7 years old while QEMU
3.1.0 was released only 3.5 years ago. Thus a chance someone would be
running such configuration should be fairly small and a combination with
upgrading 1.2.17 to 8.4.0 (or newer) with running domains should get it
pretty much to zero. The issue would disappear ff the ancient libvirt is
first upgraded to something older than 8.4.0 and then to the current
libvirt.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Jiri Denemark 2022-05-11 15:32:58 +02:00
parent 7f432214ab
commit dc2b2b3ab9
3 changed files with 25 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
src/qemu/qemu_migration_params.c
View File

@ -1385,10 +1385,10 @@ qemuMigrationParamsParse(xmlXPathContextPtr ctxt,
int
qemuMigrationCapsCheck(virQEMUDriver *driver,
virDomainObj *vm,
int asyncJob)
int asyncJob,
bool reconnect)
{
qemuDomainObjPrivate *priv = vm->privateData;
g_autoptr(virBitmap) migEvent = NULL;
g_autoptr(virJSONValue) json = NULL;
g_auto(GStrv) caps = NULL;
char **capStr;
@ -1419,22 +1419,24 @@ qemuMigrationCapsCheck(virQEMUDriver *driver,
}
}
migEvent = virBitmapNew(QEMU_MIGRATION_CAP_LAST);
if (!reconnect) {
g_autoptr(virBitmap) migEvent = virBitmapNew(QEMU_MIGRATION_CAP_LAST);
ignore_value(virBitmapSetBit(migEvent, QEMU_MIGRATION_CAP_EVENTS));
ignore_value(virBitmapSetBit(migEvent, QEMU_MIGRATION_CAP_EVENTS));
if (!(json = qemuMigrationCapsToJSON(migEvent, migEvent)))
return -1;
if (!(json = qemuMigrationCapsToJSON(migEvent, migEvent)))
return -1;
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
return -1;
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
return -1;
rc = qemuMonitorSetMigrationCapabilities(priv->mon, &json);
rc = qemuMonitorSetMigrationCapabilities(priv->mon, &json);
qemuDomainObjExitMonitor(vm);
qemuDomainObjExitMonitor(vm);
if (rc < 0)
return -1;
if (rc < 0)
return -1;
}
/* Migration events capability must always be enabled, clearing it from
* migration capabilities bitmap makes sure it won't be touched anywhere

3
src/qemu/qemu_migration_params.h
View File

@ -162,7 +162,8 @@ qemuMigrationParamsParse(xmlXPathContextPtr ctxt,
int
qemuMigrationCapsCheck(virQEMUDriver *driver,
virDomainObj *vm,
int asyncJob);
int asyncJob,
bool reconnect);
bool
qemuMigrationCapsGet(virDomainObj *vm,

14
src/qemu/qemu_process.c
View File

@ -1914,8 +1914,12 @@ qemuProcessInitMonitor(virQEMUDriver *driver,
static int
qemuConnectMonitor(virQEMUDriver *driver, virDomainObj *vm, int asyncJob,
bool retry, qemuDomainLogContext *logCtxt)
qemuConnectMonitor(virQEMUDriver *driver,
virDomainObj *vm,
int asyncJob,
bool retry,
qemuDomainLogContext *logCtxt,
bool reconnect)
{
qemuDomainObjPrivate *priv = vm->privateData;
qemuMonitor *mon = NULL;
@ -1968,7 +1972,7 @@ qemuConnectMonitor(virQEMUDriver *driver, virDomainObj *vm, int asyncJob,
if (qemuProcessInitMonitor(driver, vm, asyncJob) < 0)
return -1;
if (qemuMigrationCapsCheck(driver, vm, asyncJob) < 0)
if (qemuMigrationCapsCheck(driver, vm, asyncJob, reconnect) < 0)
return -1;
return 0;
@ -2353,7 +2357,7 @@ qemuProcessWaitForMonitor(virQEMUDriver *driver,
VIR_DEBUG("Connect monitor to vm=%p name='%s' retry=%d",
vm, vm->def->name, retry);
if (qemuConnectMonitor(driver, vm, asyncJob, retry, logCtxt) < 0)
if (qemuConnectMonitor(driver, vm, asyncJob, retry, logCtxt, false) < 0)
goto cleanup;
/* Try to get the pty path mappings again via the monitor. This is much more
@ -8773,7 +8777,7 @@ qemuProcessReconnect(void *opaque)
tryMonReconn = true;
/* XXX check PID liveliness & EXE path */
if (qemuConnectMonitor(driver, obj, VIR_ASYNC_JOB_NONE, retry, NULL) < 0)
if (qemuConnectMonitor(driver, obj, VIR_ASYNC_JOB_NONE, retry, NULL, true) < 0)
goto error;
priv->machineName = qemuDomainGetMachineName(obj);