Re: [PATCH v3 10/18] hw/block/nvme: flush write cache when disabled

[Maxim Levitsky]

On Mon, 2020-07-06 at 08:12 +0200, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> If the write cache is disabled with a Set Features command, flush it if
> currently enabled.
> 
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> Reviewed-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
> ---
>  hw/block/nvme.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index 80c7285bc1cf..8fce2ebf69e7 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -1166,6 +1166,10 @@ static uint16_t nvme_set_feature(NvmeCtrl *n, NvmeCmd 
> *cmd, NvmeRequest *req)
>  
>          break;
>      case NVME_VOLATILE_WRITE_CACHE:
> +        if (!(dw11 & 0x1) && blk_enable_write_cache(n->conf.blk)) {
> +            blk_flush(n->conf.blk);
> +        }
> +
>          blk_set_enable_write_cache(n->conf.blk, dw11 & 1);
>          break;
>      case NVME_NUMBER_OF_QUEUES:
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>

Best regards,
        Maxim Levitsky