Re: [PATCH v5 4/9] block-backend: Enable retry action on errors

[Stefan Hajnoczi]

On Fri, Feb 05, 2021 at 06:13:10PM +0800, Jiahui Cen wrote:
> Enable retry action when backend's retry timer is available. It would
> trigger the timer to do device specific retry action.
> 
> Signed-off-by: Jiahui Cen <cenjiahui@huawei.com>
> Signed-off-by: Ying Fang <fangying1@huawei.com>
> ---
>  block/block-backend.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/block/block-backend.c b/block/block-backend.c
> index a8bfaf6e4a..ab75cb1971 100644
> --- a/block/block-backend.c
> +++ b/block/block-backend.c
> @@ -1803,6 +1803,9 @@ BlockErrorAction blk_get_error_action(BlockBackend 
> *blk, bool is_read,
>          return BLOCK_ERROR_ACTION_REPORT;
>      case BLOCKDEV_ON_ERROR_IGNORE:
>          return BLOCK_ERROR_ACTION_IGNORE;
> +    case BLOCKDEV_ON_ERROR_RETRY:
> +        return (blk->retry_timer) ?
> +               BLOCK_ERROR_ACTION_RETRY : BLOCK_ERROR_ACTION_REPORT;
>      case BLOCKDEV_ON_ERROR_AUTO:
>      default:
>          abort();
> @@ -1850,6 +1853,12 @@ void blk_error_action(BlockBackend *blk, 
> BlockErrorAction action,
>          qemu_system_vmstop_request_prepare();
>          send_qmp_error_event(blk, action, is_read, error);
>          qemu_system_vmstop_request(RUN_STATE_IO_ERROR);
> +    } else if (action == BLOCK_ERROR_ACTION_RETRY) {
> +        if (!blk->quiesce_counter) {
> +            timer_mod(blk->retry_timer, 
> qemu_clock_get_ms(QEMU_CLOCK_REALTIME) +
> +                                        blk->retry_interval);

QEMU should not make any guest-visible changes while the guest is
stopped (vm_stop()). Please use QEMU_CLOCK_VIRTUAL so the timer does not
fire while the guest is stopped.

Stefan

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