diff options
| -rw-r--r-- | block/block-backend.c | 40 | ||||
| -rw-r--r-- | include/block/block.h | 2 | ||||
| -rw-r--r-- | migration/migration.c | 8 | ||||
| -rw-r--r-- | qmp.c | 6 |
4 files changed, 55 insertions, 1 deletions
diff --git a/block/block-backend.c b/block/block-backend.c index 0b6377332c..18ece99c6e 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -61,6 +61,7 @@ struct BlockBackend { uint64_t perm; uint64_t shared_perm; + bool disable_perm; bool allow_write_beyond_eof; @@ -578,7 +579,7 @@ int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, { int ret; - if (blk->root) { + if (blk->root && !blk->disable_perm) { ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); if (ret < 0) { return ret; @@ -597,15 +598,52 @@ void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) *shared_perm = blk->shared_perm; } +/* + * Notifies the user of all BlockBackends that migration has completed. qdev + * devices can tighten their permissions in response (specifically revoke + * shared write permissions that we needed for storage migration). + * + * If an error is returned, the VM cannot be allowed to be resumed. + */ +void blk_resume_after_migration(Error **errp) +{ + BlockBackend *blk; + Error *local_err = NULL; + + for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) { + if (!blk->disable_perm) { + continue; + } + + blk->disable_perm = false; + + blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); + if (local_err) { + error_propagate(errp, local_err); + blk->disable_perm = true; + return; + } + } +} + static int blk_do_attach_dev(BlockBackend *blk, void *dev) { if (blk->dev) { return -EBUSY; } + + /* While migration is still incoming, we don't need to apply the + * permissions of guest device BlockBackends. We might still have a block + * job or NBD server writing to the image for storage migration. */ + if (runstate_check(RUN_STATE_INMIGRATE)) { + blk->disable_perm = true; + } + blk_ref(blk); blk->dev = dev; blk->legacy_dev = false; blk_iostatus_reset(blk); + return 0; } diff --git a/include/block/block.h b/include/block/block.h index 5149260827..3e09222f5f 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -366,6 +366,8 @@ void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp); void bdrv_invalidate_cache_all(Error **errp); int bdrv_inactivate_all(void); +void blk_resume_after_migration(Error **errp); + /* Ensure contents are flushed to disk. */ int bdrv_flush(BlockDriverState *bs); int coroutine_fn bdrv_co_flush(BlockDriverState *bs); diff --git a/migration/migration.c b/migration/migration.c index 54060f749a..ad4036fdb1 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -349,6 +349,14 @@ static void process_incoming_migration_bh(void *opaque) exit(EXIT_FAILURE); } + /* If we get an error here, just don't restart the VM yet. */ + blk_resume_after_migration(&local_err); + if (local_err) { + error_free(local_err); + local_err = NULL; + autostart = false; + } + /* * This must happen after all error conditions are dealt with and * we're sure the VM is going to be running on this host. @@ -207,6 +207,12 @@ void qmp_cont(Error **errp) } } + blk_resume_after_migration(&local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + if (runstate_check(RUN_STATE_INMIGRATE)) { autostart = 1; } else { |