RE: [PATCH v5 04/10] Remove migrate_set_block_enabled in checkpoint

["Zhang, Chen" <chen.zhang@intel.com>]

> -----Original Message-----
> From: Rao, Lei <lei.rao@intel.com>
> Sent: Thursday, April 1, 2021 3:47 PM
> To: Zhang, Chen <chen.zhang@intel.com>; lizhijian@cn.fujitsu.com;
> jasowang@redhat.com; quintela@redhat.com; dgilbert@redhat.com;
> pbonzini@redhat.com; lukasstraub2@web.de
> Cc: qemu-devel@nongnu.org; Rao, Lei <lei.rao@intel.com>
> Subject: [PATCH v5 04/10] Remove migrate_set_block_enabled in
> checkpoint
> 
> From: "Rao, Lei" <lei.rao@intel.com>
> 
> We can detect disk migration in migrate_prepare, if disk migration is enabled
> in COLO mode, we can directly report an error.and there is no need to
> disable block migration at every checkpoint.
> 
> Signed-off-by: Lei Rao <lei.rao@intel.com>
> Signed-off-by: Zhang Chen <chen.zhang@intel.com>
> Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>

Reviewed-by: Zhang Chen <chen.zhang@intel.com>

> ---
>  migration/colo.c      | 6 ------
>  migration/migration.c | 4 ++++
>  2 files changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/migration/colo.c b/migration/colo.c index de27662..1aaf316
> 100644
> --- a/migration/colo.c
> +++ b/migration/colo.c
> @@ -435,12 +435,6 @@ static int
> colo_do_checkpoint_transaction(MigrationState *s,
>      if (failover_get_state() != FAILOVER_STATUS_NONE) {
>          goto out;
>      }
> -
> -    /* Disable block migration */
> -    migrate_set_block_enabled(false, &local_err);
> -    if (local_err) {
> -        goto out;
> -    }
>      qemu_mutex_lock_iothread();
> 
>  #ifdef CONFIG_REPLICATION
> diff --git a/migration/migration.c b/migration/migration.c index
> ca8b97b..4578f22 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -2219,6 +2219,10 @@ static bool migrate_prepare(MigrationState *s,
> bool blk, bool blk_inc,
>      }
> 
>      if (blk || blk_inc) {
> +        if (migrate_colo_enabled()) {
> +            error_setg(errp, "No disk migration is required in COLO mode");
> +            return false;
> +        }
>          if (migrate_use_block() || migrate_use_block_incremental()) {
>              error_setg(errp, "Command options are incompatible with "
>                         "current migration capabilities");
> --
> 1.8.3.1