Re: [PATCH 1/6] migration: Add migration prefix to functions in target.c

[Peter Xu <peterx@redhat.com>]

On Mon, Aug 28, 2023 at 06:18:37PM +0300, Avihai Horon wrote:
> The functions in target.c are not static, yet they don't have a proper
> migration prefix. Add such prefix.
> 
> Signed-off-by: Avihai Horon <avihaih@nvidia.com>

No issue on the patch itself, but just noticed that we have hard-coded vfio
calls in migration paths.. that's slightly unfortunate. :(

> ---
>  migration/migration.h | 4 ++--
>  migration/migration.c | 6 +++---
>  migration/savevm.c    | 2 +-
>  migration/target.c    | 8 ++++----
>  4 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/migration/migration.h b/migration/migration.h
> index 6eea18db36..c5695de214 100644
> --- a/migration/migration.h
> +++ b/migration/migration.h
> @@ -512,8 +512,8 @@ void migration_consume_urgent_request(void);
>  bool migration_rate_limit(void);
>  void migration_cancel(const Error *error);
>  
> -void populate_vfio_info(MigrationInfo *info);
> -void reset_vfio_bytes_transferred(void);
> +void migration_populate_vfio_info(MigrationInfo *info);
> +void migration_reset_vfio_bytes_transferred(void);
>  void postcopy_temp_page_reset(PostcopyTmpPage *tmp_page);
>  
>  #endif
> diff --git a/migration/migration.c b/migration/migration.c
> index 5528acb65e..92866a8f49 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -1039,7 +1039,7 @@ static void fill_source_migration_info(MigrationInfo *info)
>          populate_time_info(info, s);
>          populate_ram_info(info, s);
>          populate_disk_info(info);
> -        populate_vfio_info(info);
> +        migration_populate_vfio_info(info);

(maybe in the future we should have SaveVMHandlers hooks for populating
 data for ram/disk/vfio/..., or some other way to not hard-code these)

>          break;
>      case MIGRATION_STATUS_COLO:
>          info->has_status = true;
> @@ -1048,7 +1048,7 @@ static void fill_source_migration_info(MigrationInfo *info)
>      case MIGRATION_STATUS_COMPLETED:
>          populate_time_info(info, s);
>          populate_ram_info(info, s);
> -        populate_vfio_info(info);
> +        migration_populate_vfio_info(info);
>          break;
>      case MIGRATION_STATUS_FAILED:
>          info->has_status = true;
> @@ -1641,7 +1641,7 @@ static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc,
>       */
>      memset(&mig_stats, 0, sizeof(mig_stats));
>      memset(&compression_counters, 0, sizeof(compression_counters));
> -    reset_vfio_bytes_transferred();
> +    migration_reset_vfio_bytes_transferred();

Could this already be done during vfio_save_setup(), to avoid calling an
vfio function directly in migration.c?

Again, not a request for this patchset, but more to see whether it'll work
to be moved there.

Thanks,

>  
>      return true;
>  }

-- 
Peter Xu