Re: [Qemu-devel] [PATCH v4 3/5] s390x/cpumodel: Set up CPU model for AP device support

[Christian Borntraeger]

On 04/16/2018 05:44 PM, David Hildenbrand wrote:
> 
>>  
>> diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c
>> index 0cdbc15..0d5b0f7 100644
>> --- a/target/s390x/gen-features.c
>> +++ b/target/s390x/gen-features.c
>> @@ -447,6 +447,9 @@ static uint16_t full_GEN12_GA1[] = {
>>      S390_FEAT_ADAPTER_INT_SUPPRESSION,
>>      S390_FEAT_EDAT_2,
>>      S390_FEAT_SIDE_EFFECT_ACCESS_ESOP2,
>> +    S390_FEAT_AP_QUERY_CONFIG_INFO,
>> +    S390_FEAT_AP_FACILITIES_TEST,
>> +    S390_FEAT_AP,
>>  };
>>  
> 
> Now I have to ask a very stupid question:
> 
> I heard that the execution controls in the SIE block for AP are one of
> the oldest ones we have around. How can it be that the AP feature cannot
> be used before zEC12?

It was a suggestion from the crypto team due to testability. Nobody has a z196
with the older cards.