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cpr: relax vhost migration blockers 

vhost blocks migration if logging is not supported to track dirty
memory, and vhost-user blocks it if the log cannot be saved to a shm fd.

vhost-vdpa blocks migration if both hosts do not support all the device's
features using a shadow VQ, for tracking requests and dirty memory.

vhost-scsi blocks migration if storage cannot be shared across hosts,
or if state cannot be migrated.

None of these conditions apply if the old and new qemu processes do
not run concurrently, and if new qemu starts on the same host as old,
which is the case for cpr.

Narrow the scope of these blockers so they only apply to normal mode.
They will not block cpr modes when they are added in subsequent patches.

No functional change until a new mode is added.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <1698263069-406971-5-git-send-email-steven.sistare@oracle.com>
master
Steve Sistare 2023-10-25 12:44:27 -07:00 committed by Juan Quintela
parent e0ee3a8ff7
commit 89415796f6
2 changed files with 2 additions and 2 deletions
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2
hw/scsi/vhost-scsi.c
View File

@ -210,7 +210,7 @@ static void vhost_scsi_realize(DeviceState *dev, Error **errp)
"When external environment supports it (Orchestrator migrates "
"target SCSI device state or use shared storage over network), "
"set 'migratable' property to true to enable migration.");
if (migrate_add_blocker(&vsc->migration_blocker, errp) < 0) {
if (migrate_add_blocker_normal(&vsc->migration_blocker, errp) < 0) {
goto free_virtio;
}
}

2
hw/virtio/vhost.c
View File

@ -1527,7 +1527,7 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
}
if (hdev->migration_blocker != NULL) {
r = migrate_add_blocker(&hdev->migration_blocker, errp);
r = migrate_add_blocker_normal(&hdev->migration_blocker, errp);
if (r < 0) {
goto fail_busyloop;
}