Re: [PATCH 15/17] hw/block/nvme: enforce valid queue creation sequence

[Dmitry Fomichev]

Looks good,

Reviewed-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>

On Mon, 2020-06-29 at 20:26 +0200, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> Support returning Command Sequence Error if Set Features on Number of
> Queues is called after queues have been created.
> 
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
> ---
>  hw/block/nvme.c | 12 ++++++++++++
>  hw/block/nvme.h |  1 +
>  2 files changed, 13 insertions(+)
> 
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index 8a816b558eeb..798f6f30e7da 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -911,6 +911,13 @@ static uint16_t nvme_create_cq(NvmeCtrl *n, NvmeCmd *cmd)
>      cq = g_malloc0(sizeof(*cq));
>      nvme_init_cq(cq, n, prp1, cqid, vector, qsize + 1,
>          NVME_CQ_FLAGS_IEN(qflags));
> +
> +    /*
> +     * It is only required to set qs_created when creating a completion 
> queue;
> +     * creating a submission queue without a matching completion queue will
> +     * fail.
> +     */
> +    n->qs_created = true;
>      return NVME_SUCCESS;
>  }
>  
> @@ -1298,6 +1305,10 @@ static uint16_t nvme_set_feature(NvmeCtrl *n, NvmeCmd 
> *cmd, NvmeRequest *req)
>          blk_set_enable_write_cache(n->conf.blk, dw11 & 1);
>          break;
>      case NVME_NUMBER_OF_QUEUES:
> +        if (n->qs_created) {
> +            return NVME_CMD_SEQ_ERROR | NVME_DNR;
> +        }
> +
>          /*
>           * NVMe v1.3, Section 5.21.1.7: 0xffff is not an allowed value for 
> NCQR
>           * and NSQR.
> @@ -1430,6 +1441,7 @@ static void nvme_clear_ctrl(NvmeCtrl *n)
>  
>      n->aer_queued = 0;
>      n->outstanding_aers = 0;
> +    n->qs_created = false;
>  
>      blk_flush(n->conf.blk);
>      n->bar.cc = 0;
> diff --git a/hw/block/nvme.h b/hw/block/nvme.h
> index 34dddda29d96..54ec54f491bf 100644
> --- a/hw/block/nvme.h
> +++ b/hw/block/nvme.h
> @@ -124,6 +124,7 @@ typedef struct NvmeCtrl {
>      BlockConf    conf;
>      NvmeParams   params;
>  
> +    bool        qs_created;
>      uint32_t    page_size;
>      uint16_t    page_bits;
>      uint16_t    max_prp_ents;