Re: [PATCH v2 12/12] KVM: s390: introduce the format-1 GISA

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On 01/25/2018 04:31 PM, David Hildenbrand wrote:
[...]
>>  struct kvm_s390_vsie {
>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
>> index 68d7eef..efde264 100644
>> --- a/arch/s390/kvm/kvm-s390.c
>> +++ b/arch/s390/kvm/kvm-s390.c
>> @@ -2518,6 +2518,8 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
>>  	vcpu->arch.sie_block->icpua = id;
>>  	spin_lock_init(&vcpu->arch.local_int.lock);
>>  	vcpu->arch.sie_block->gd = (u32)(u64)kvm->arch.gisa;
>> +	if (vcpu->arch.sie_block->gd && sclp.has_gisaf)
>> +		vcpu->arch.sie_block->gd |= GISA_FORMAT1;
>>  	seqcount_init(&vcpu->arch.cputm_seqcount);
>>  
>>  	rc = kvm_vcpu_init(vcpu, kvm, id);
>>
> 
> So, what does this bring us? We don't seem to be using any new GISA-1
> features.

Preparation for device pass-through interrupt forwarding.




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