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qemu: allow migration with assigned PCI hostdev if <teaming> is set

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Normally a PCI hostdev can't be migrated, so
qemuMigrationSrcIsAllowedHostdev() won't permit it. In the case of a a
hostdev network interface that has <teaming type='transient'/> set,
QEMU will automatically unplug the device prior to migration, and
re-plug a corresponding device on the destination. This patch modifies
qemuMigrationSrcIsAllowedHostdev() to allow domains with those devices
to be migrated.

Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Laine Stump 2020-01-09 19:39:47 -05:00
parent eb9f6cc4b3
commit 2758f680b7
1 changed files with 48 additions and 4 deletions
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52
src/qemu/qemu_migration.c
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@ -1092,10 +1092,54 @@ qemuMigrationSrcIsAllowedHostdev(const virDomainDef *def)
* forbidden. */
for (i = 0; i < def->nhostdevs; i++) {
virDomainHostdevDefPtr hostdev = def->hostdevs[i];
if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS ||
hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("domain has assigned non-USB host devices"));
switch ((virDomainHostdevMode)hostdev->mode) {
case VIR_DOMAIN_HOSTDEV_MODE_CAPABILITIES:
virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
_("cannot migrate a domain with <hostdev mode='capabilities'>"));
return false;
case VIR_DOMAIN_HOSTDEV_MODE_SUBSYS:
switch ((virDomainHostdevSubsysType)hostdev->source.subsys.type) {
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB:
/* USB devices can be "migrated" */
continue;
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI:
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI_HOST:
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_MDEV:
virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
_("cannot migrate a domain with <hostdev mode='subsystem' type='%s'>"),
virDomainHostdevSubsysTypeToString(hostdev->source.subsys.type));
return false;
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI:
/*
* if this is a network interface with <teaming
* type='transient'>, migration *is* allowed because
* the device will be auto-unplugged by QEMU during
* migration.
*/
if (hostdev->parentnet &&
hostdev->parentnet->teaming.type == VIR_DOMAIN_NET_TEAMING_TYPE_TRANSIENT) {
continue;
}
/* all other PCI hostdevs can't be migrated */
virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
_("cannot migrate a domain with <hostdev mode='subsystem' type='%s'>"),
virDomainHostdevSubsysTypeToString(hostdev->source.subsys.type));
return false;
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_LAST:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("invalid hostdev subsystem type"));
return false;
}
break;
case VIR_DOMAIN_HOSTDEV_MODE_LAST:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("invalid hostdev mode"));
return false;
}
}