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>

diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c
index 5d9e06a9bb08780bedeb0f0d6dcf7dd54a853367..3126df9e1d9d5553a673128200b494fea22c1ff4 100644 (file)
--- a/hw/scsi/vhost-scsi.c
+++ b/hw/scsi/vhost-scsi.c
@@ -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;
         }
     }

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index aa7b2724529274e4e91cb5d43e173990533ab5b7..9c9ae7109e9f2f8d75102fce463a14d40dcdf474 100644 (file)
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -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;
         }