Re: [PATCH v2] hw/block/nvme: add missing mor/mar constraint checks

[Dmitry Fomichev <Dmitry.Fomichev@wdc.com>]

On Tue, 2021-01-26 at 13:15 +0100, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> Firstly, if zoned.max_active is non-zero, zoned.max_open must be less
> than or equal to zoned.max_active.
> 
> Secondly, if only zones.max_active is set, we have to explicitly set
> zones.max_open or we end up with an invalid MAR/MOR configuration. This
> is an artifact of the parameters not being zeroes-based like in the
> spec.
> 
> Cc: Dmitry Fomichev <dmitry.fomichev@wdc.com>
> Reported-by: Gollu Appalanaidu <anaidu.gollu@samsung.com>
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>

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

> ---
> 
> v2:
> 
>   * Jumped the gun on removing the check on zoned.max_open. It should
>     still be done since the device might only have a constraint on open
>     zones, not active.
>   * Instead, added an explicit set of zoned.max_open if only
>     zoned.max_active is specifed.
> 
>  hw/block/nvme-ns.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/hw/block/nvme-ns.c b/hw/block/nvme-ns.c
> index 62b25cf69bfa..df514287b58f 100644
> --- a/hw/block/nvme-ns.c
> +++ b/hw/block/nvme-ns.c
> @@ -153,6 +153,18 @@ static int nvme_ns_zoned_check_calc_geometry(NvmeNamespace *ns, Error **errp)
>          return -1;
>      }
>  
> 
> 
> 
> +    if (ns->params.max_active_zones) {
> +        if (ns->params.max_open_zones > ns->params.max_active_zones) {
> +            error_setg(errp, "max_open_zones (%u) exceeds max_active_zones (%u)",
> +                       ns->params.max_open_zones, ns->params.max_active_zones);
> +            return -1;
> +        }
> +
> +        if (!ns->params.max_open_zones) {
> +            ns->params.max_open_zones = ns->params.max_active_zones;
> +        }
> +    }
> +
>      if (ns->params.zd_extension_size) {
>          if (ns->params.zd_extension_size & 0x3f) {
>              error_setg(errp,