On 08/28/2017 09:27 PM, David Hildenbrand wrote:
>
>> rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
>> diff --git a/arch/s390/tools/gen_facilities.c b/arch/s390/tools/gen_facilities.c
>> index 025ea20..181db5b 100644
>> --- a/arch/s390/tools/gen_facilities.c
>> +++ b/arch/s390/tools/gen_facilities.c
>> @@ -80,6 +80,7 @@ static struct facility_def facility_defs[] = {
>> 78, /* enhanced-DAT 2 */
>> 130, /* instruction-execution-protection */
>> 131, /* enhanced-SOP 2 and side-effect */
>> + 138, /* configuration z/architecture mode (czam) */
>> 146, /* msa extension 8 */
>> -1 /* END */
>> }
>>
>
> Thinking about it, this should be the right thing to do instead of the
> last hunk:
>
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 84c069afc02f..39115f5a38df 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -1927,6 +1927,10 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned
> long type)
> memcpy(kvm->arch.model.fac_list, kvm->arch.model.fac_mask,
> S390_ARCH_FAC_LIST_SIZE_BYTE);
>
> + /* we are always in CZAM mode - even on pre z14 machines */
> + set_kvm_facility(kvm->arch.model.fac_mask, 138);
> + set_kvm_facility(kvm->arch.model.fac_list, 138);
> + /* we emulate STHYI in kvm */
> set_kvm_facility(kvm->arch.model.fac_mask, 74);
> set_kvm_facility(kvm->arch.model.fac_list, 74);
> if (MACHINE_HAS_TLB_GUEST) {
>
> That would produce consistent results for very old QEMU.
>
This should be identical as the initial fac_list is populated from the fac_mask,
which is populated by the facility_defs structure.
[..]
/* Populate the facility list initially. */
kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
----> memcpy(kvm->arch.model.fac_list, kvm->arch.model.fac_mask,
S390_ARCH_FAC_LIST_SIZE_BYTE);
[,..]
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