Re: [Qemu-devel] [PATCH v10 2/6] s390x/cpumodel: Set up CPU model for AP device support

[Halil Pasic]

On 10/09/2018 07:52 PM, Tony Krowiak wrote:
> A new CPU model feature and two new CPU model facilities are
> introduced to support AP devices for a KVM guest.
> 
> CPU model features:
> 
> 1. The S390_FEAT_AP CPU model feature indicates whether AP
>    instructions are available to the guest. This feature will
>    be enabled only if the AP instructions are available on the
>    linux host as determined by the availability of the
>    KVM_S390_VM_CRYPTO_ENABLE_APIE VM attribute which is exposed
>    by KVM only if the AP instructions are available on the
>    host.
> 
>    This feature must be turned on from userspace to execute AP
>    instructions on the KVM guest. The QEMU command line to turn
>    this feature on looks something like this:
> 
>       qemu-system-s390x ... -cpu xxx,ap=on ...
> 
>    This feature will be supported for zEC12 and newer CPU models.
>    The feature will not be supported for older models because
>    there are few older systems on which to test and the older
>    crypto cards will be going out of service in the relatively
>    near future.
> 
> CPU model facilities:
> 
> 1. The S390_FEAT_AP_QUERY_CONFIG_INFO feature indicates whether the
>    AP Query Configuration Information (QCI) facility is available
>    to the guest as determined by whether the facility is available
>    on the host. This feature will be exposed by KVM only if the
>    QCI facility is installed on the host.
> 
> 2. The S390_FEAT_AP_FACILITY_TEST feature indicates whether the AP
>    Facility Test (APFT) facility is available to the guest as
>    determined by whether the facility is available on the host.
>    This feature will be exposed by KVM only if APFT is installed
>    on the host.
> 
> Signed-off-by: Tony Krowiak <address@hidden>
> Tested-by: Pierre Morel<address@hidden>

Reviewed-by: Halil Pasic <address@hidden>