On 06/03/2016 09:00, Xiao Guangrong wrote:
>>
>> if (vcpu_match_mmio_gva(vcpu, gva)
>> && !permission_fault(vcpu, vcpu->arch.walk_mmu,
>> - vcpu->arch.access, access)) {
>> + vcpu->arch.access, 0, access)) {
>
> No. The pkey is not always 0.
>
> We should cache PKEY for the mmio access and use it here to check if the
> right is adequate.
This is just an optimization I think, so it can have false negatives (it
won't have many in practice because MMIO accesses are usually done in
supervisor mode). The actual check is done when
vcpu->arch.walk_mmu->gva_to_gpa is called.
Paolo
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