virtio-mem: Update state to match bitmap as soon as it's been migrated

It's cleaner and future-proof to just have other state that depends on the
bitmap state to be updated as soon as possible when restoring the bitmap.

So factor out informing RamDiscardListener into a functon and call it in
case of early migration right after we restored the bitmap.

Message-ID: <20230926185738.277351-16-david@redhat.com>
Reviewed-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>

1 files changed, 21 insertions, 5 deletions

diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c
index 0b0e6c5090..0cf47df9cf 100644
--- a/hw/virtio/virtio-mem.c
+++ b/hw/virtio/virtio-mem.c
@@ -984,9 +984,8 @@ static int virtio_mem_restore_unplugged(VirtIOMEM *vmem)
                                                virtio_mem_discard_range_cb);
 }
 
-static int virtio_mem_post_load(void *opaque, int version_id)
+static int virtio_mem_post_load_bitmap(VirtIOMEM *vmem)
 {
-    VirtIOMEM *vmem = VIRTIO_MEM(opaque);
     RamDiscardListener *rdl;
     int ret;
 
@@ -1001,6 +1000,20 @@ static int virtio_mem_post_load(void *opaque, int version_id)
             return ret;
         }
     }
+    return 0;
+}
+
+static int virtio_mem_post_load(void *opaque, int version_id)
+{
+    VirtIOMEM *vmem = VIRTIO_MEM(opaque);
+    int ret;
+
+    if (!vmem->early_migration) {
+        ret = virtio_mem_post_load_bitmap(vmem);
+        if (ret) {
+            return ret;
+        }
+    }
 
     /*
      * If shared RAM is migrated using the file content and not using QEMU,
@@ -1043,7 +1056,7 @@ static int virtio_mem_post_load_early(void *opaque, int version_id)
     int ret;
 
     if (!vmem->prealloc) {
-        return 0;
+        goto post_load_bitmap;
     }
 
     /*
@@ -1051,7 +1064,7 @@ static int virtio_mem_post_load_early(void *opaque, int version_id)
      * don't mess with preallocation and postcopy.
      */
     if (migrate_ram_is_ignored(rb)) {
-        return 0;
+        goto post_load_bitmap;
     }
 
     /*
@@ -1084,7 +1097,10 @@ static int virtio_mem_post_load_early(void *opaque, int version_id)
             return -EBUSY;
         }
     }
-    return 0;
+
+post_load_bitmap:
+    /* Finally, update any other state to be consistent with the new bitmap. */
+    return virtio_mem_post_load_bitmap(vmem);
 }
 
 typedef struct VirtIOMEMMigSanityChecks {