On May  8 17:36, Changqi Lu wrote:
> Add reservation acquire, reservation register,
> reservation release and reservation report commands
> in the nvme device layer.
> 
> By introducing these commands, this enables the nvme
> device to perform reservation-related tasks, including
> querying keys, querying reservation status, registering
> reservation keys, initiating and releasing reservations,
> as well as clearing and preempting reservations held by
> other keys.
> 
> These commands are crucial for management and control of
> shared storage resources in a persistent manner.
> 
> Signed-off-by: Changqi Lu <luchangqi.123@bytedance.com>
> Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
> ---
>  hw/nvme/ctrl.c       | 304 ++++++++++++++++++++++++++++++++++++++++++-
>  hw/nvme/nvme.h       |   4 +
>  include/block/nvme.h |  37 ++++++
>  3 files changed, 344 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
> index 127c3d2383..1f881fc44c 100644
> --- a/hw/nvme/ctrl.c
> +++ b/hw/nvme/ctrl.c
> @@ -294,6 +294,10 @@ static const uint32_t nvme_cse_iocs_nvm[256] = {
>      [NVME_CMD_COMPARE]              = NVME_CMD_EFF_CSUPP,
>      [NVME_CMD_IO_MGMT_RECV]         = NVME_CMD_EFF_CSUPP,
>      [NVME_CMD_IO_MGMT_SEND]         = NVME_CMD_EFF_CSUPP | NVME_CMD_EFF_LBCC,
> +    [NVME_CMD_RESV_REGISTER]        = NVME_CMD_EFF_CSUPP,
> +    [NVME_CMD_RESV_REPORT]          = NVME_CMD_EFF_CSUPP,
> +    [NVME_CMD_RESV_ACQUIRE]         = NVME_CMD_EFF_CSUPP,
> +    [NVME_CMD_RESV_RELEASE]         = NVME_CMD_EFF_CSUPP,
>  };

We need to indicate support for these commands in ONCS, right? And that
should depend on if or not the underlying block device supports it.