Re: [PATCH] KVM: x86: add hint to skip hidden rdpkru under kvm_load_host_xsave_state

[Paolo Bonzini]

On 17/05/21 15:54, Dave Hansen wrote:
> On 5/13/21 10:11 PM, Andy Lutomirski wrote:
> > I don't even want to think about what happens if a perf NMI hits and
> > accesses host user memory while the guest PKRU is live (on VMX -- I
> > think this can't happen on SVM).
>
> What's the relevant difference between SVM and VMX here?  I'm missing
> something.

SVM has the global interrupt flag that blocks NMIs and SMIs, and PKRU is 
loaded while GIF=0.

Paolo