migration/block-active: Remove global active flag

Block devices have an individual active state, a single global flag
can't cover this correctly. This becomes more important as we allow
users to manually manage which nodes are active or inactive.

Now that it's allowed to call bdrv_inactivate_all() even when some
nodes are already inactive, we can remove the flag and just
unconditionally call bdrv_inactivate_all() and, more importantly,
bdrv_activate_all() before we make use of the nodes.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20250204211407.381505-5-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/migration/block-active.c b/migration/block-active.c
index d477cf81828c0beb63a3a4da5e8d3e52dc65540b..40e986aadea407436138911625ca35d71af369e1 100644 (file)
--- a/migration/block-active.c
+++ b/migration/block-active.c
@@ -12,51 +12,12 @@
 #include "qemu/error-report.h"
 #include "trace.h"
 
-/*
- * Migration-only cache to remember the block layer activation status.
- * Protected by BQL.
- *
- * We need this because..
- *
- * - Migration can fail after block devices are invalidated (during
- *   switchover phase).  When that happens, we need to be able to recover
- *   the block drive status by re-activating them.
- *
- * - Currently bdrv_inactivate_all() is not safe to be invoked on top of
- *   invalidated drives (even if bdrv_activate_all() is actually safe to be
- *   called any time!).  It means remembering this could help migration to
- *   make sure it won't invalidate twice in a row, crashing QEMU.  It can
- *   happen when we migrate a PAUSED VM from host1 to host2, then migrate
- *   again to host3 without starting it.  TODO: a cleaner solution is to
- *   allow safe invoke of bdrv_inactivate_all() at anytime, like
- *   bdrv_activate_all().
- *
- * For freshly started QEMU, the flag is initialized to TRUE reflecting the
- * scenario where QEMU owns block device ownerships.
- *
- * For incoming QEMU taking a migration stream, the flag is initialized to
- * FALSE reflecting that the incoming side doesn't own the block devices,
- * not until switchover happens.
- */
-static bool migration_block_active;
-
-/* Setup the disk activation status */
-void migration_block_active_setup(bool active)
-{
-    migration_block_active = active;
-}
-
 bool migration_block_activate(Error **errp)
 {
     ERRP_GUARD();
 
     assert(bql_locked());
 
-    if (migration_block_active) {
-        trace_migration_block_activation("active-skipped");
-        return true;
-    }
-
     trace_migration_block_activation("active");
 
     bdrv_activate_all(errp);
@@ -65,7 +26,6 @@ bool migration_block_activate(Error **errp)
         return false;
     }
 
-    migration_block_active = true;
     return true;
 }
 
@@ -75,11 +35,6 @@ bool migration_block_inactivate(void)
 
     assert(bql_locked());
 
-    if (!migration_block_active) {
-        trace_migration_block_activation("inactive-skipped");
-        return true;
-    }
-
     trace_migration_block_activation("inactive");
 
     ret = bdrv_inactivate_all();
@@ -89,6 +44,5 @@ bool migration_block_inactivate(void)
         return false;
     }
 
-    migration_block_active = false;
     return true;
 }

diff --git a/migration/migration.c b/migration/migration.c
index 74c50cc72ca12799f375af1a36a2410791d727a6..95e05bbc3baf3d9111cc9cdb260b22c3050b05f4 100644 (file)
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1895,12 +1895,6 @@ void qmp_migrate_incoming(const char *uri, bool has_channels,
         return;
     }
 
-    /*
-     * Newly setup incoming QEMU.  Mark the block active state to reflect
-     * that the src currently owns the disks.
-     */
-    migration_block_active_setup(false);
-
     once = false;
 }
 
@@ -3992,8 +3986,6 @@ static void migration_instance_init(Object *obj)
     ms->state = MIGRATION_STATUS_NONE;
     ms->mbps = -1;
     ms->pages_per_second = -1;
-    /* Freshly started QEMU owns all the block devices */
-    migration_block_active_setup(true);
     qemu_sem_init(&ms->pause_sem, 0);
     qemu_mutex_init(&ms->error_mutex);
 

diff --git a/migration/migration.h b/migration/migration.h
index 4c1fafc2b5a399a34ae261f915704c0d14773492..8b24cbedd13075f8feff70e56db3549d21369c08 100644 (file)
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -554,7 +554,4 @@ void migration_bitmap_sync_precopy(bool last_stage);
 void dirty_bitmap_mig_init(void);
 bool should_send_vmdesc(void);
 
-/* migration/block-active.c */
-void migration_block_active_setup(bool active);
-
 #endif