Re: [Qemu-devel] [PATCH v2] s390x/cpumodel: model PTFF subfunctions for Multiple-epoch facility

[Christian Borntraeger]

Looks sane on a z14.
Tested-by: Christian Borntraeger <address@hidden>


On 02/05/2018 11:29 AM, David Hildenbrand wrote:
> --- a/target/s390x/kvm.c
> +++ b/target/s390x/kvm.c
> @@ -2221,6 +2221,14 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, 
> Error **errp)
>          return;
>      }
> 
> +    /* PTFF subfunctions might be indicated although kernel support missing 
> */
> +    if (!test_bit(S390_FEAT_MULTIPLE_EPOCH, model->features)) {
> +        clear_bit(S390_FEAT_PTFF_QSIE, model->features);
> +        clear_bit(S390_FEAT_PTFF_QTOUE, model->features);
> +        clear_bit(S390_FEAT_PTFF_STOE, model->features);
> +        clear_bit(S390_FEAT_PTFF_STOUE, model->features);
> +    }
> +
>      /* with cpu model support, CMM is only indicated if really available */
>      if (kvm_s390_cmma_available()) {
>          set_bit(S390_FEAT_CMM, model->features);
> 

Do you also want to add something to check_consistency ?

Right now the following user error 
-cpu z14,mepoch=off,mepochptff=on
is accepted.
On the other hand we also have no consistency checks for other subfunctions.