RE: [PATCH 6/9] hw/block/nvme: reject io commands if only admin command set selected

[Dmitry Fomichev]

> -----Original Message-----
> From: Keith Busch <kbusch@kernel.org>
> Sent: Wednesday, September 30, 2020 6:04 PM
> To: qemu-block@nongnu.org; qemu-devel@nongnu.org; Klaus Jensen
> <k.jensen@samsung.com>
> Cc: Niklas Cassel <Niklas.Cassel@wdc.com>; Dmitry Fomichev
> <Dmitry.Fomichev@wdc.com>; Kevin Wolf <kwolf@redhat.com>; Philippe
> Mathieu-Daudé <philmd@redhat.com>; Keith Busch <kbusch@kernel.org>
> Subject: [PATCH 6/9] hw/block/nvme: reject io commands if only admin
> command set selected
> 
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> If the host sets CC.CSS to 111b, all commands submitted to I/O queues
> should be completed with status Invalid Command Opcode.
> 
> Note that this is technically a v1.4 feature, but it does not hurt to
> implement before we finally bump the reported version implemented.
> 
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> Signed-off-by: Keith Busch <kbusch@kernel.org>

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

> ---
>  hw/block/nvme.c      | 4 ++++
>  include/block/nvme.h | 5 +++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index ec7363ea40..80730e1c03 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -1026,6 +1026,10 @@ static uint16_t nvme_io_cmd(NvmeCtrl *n,
> NvmeRequest *req)
>      trace_pci_nvme_io_cmd(nvme_cid(req), nsid, nvme_sqid(req),
>                            req->cmd.opcode, nvme_io_opc_str(req->cmd.opcode));
> 
> +    if (NVME_CC_CSS(n->bar.cc) == NVME_CC_CSS_ADMIN_ONLY) {
> +        return NVME_INVALID_OPCODE | NVME_DNR;
> +    }
> +
>      if (!nvme_nsid_valid(n, nsid)) {
>          return NVME_INVALID_NSID | NVME_DNR;
>      }
> diff --git a/include/block/nvme.h b/include/block/nvme.h
> index 521533fd2a..6de2d5aa75 100644
> --- a/include/block/nvme.h
> +++ b/include/block/nvme.h
> @@ -115,6 +115,11 @@ enum NvmeCcMask {
>  #define NVME_CC_IOSQES(cc) ((cc >> CC_IOSQES_SHIFT) &
> CC_IOSQES_MASK)
>  #define NVME_CC_IOCQES(cc) ((cc >> CC_IOCQES_SHIFT) &
> CC_IOCQES_MASK)
> 
> +enum NvmeCcCss {
> +    NVME_CC_CSS_NVM        = 0x0,
> +    NVME_CC_CSS_ADMIN_ONLY = 0x7,
> +};
> +
>  enum NvmeCstsShift {
>      CSTS_RDY_SHIFT      = 0,
>      CSTS_CFS_SHIFT      = 1,
> --
> 2.24.1