Re: [PATCH] KVM: MMU: shadow nested paging does not have PKU

[Tom Lendacky]

On 11/27/21 4:25 AM, Paolo Bonzini wrote:
> On 11/27/21 02:21, Lai Jiangshan wrote:
> > On 2021/11/26 21:21, Paolo Bonzini wrote:
> > > Initialize the mask for PKU permissions as if CR4.PKE=0, avoiding
> > > incorrect interpretations of the nested hypervisor's page tables.
> >
> > I think the AMD64 volume2 Architecture Programmer’s Manual does not
> > specify it, but it seems that for a sane NPT walk, PKU should not work
> > in NPT.
>
> The PK bit is not defined in the nested page fault EXITINFO1, too. Thomas, 
> can you have it fixed in the APM that the host's SMEP, SMAP and PKE bits 
> do not affect nested page table walks?

I talked to our documentation folks and they will look to update the APM 
with the appropriate information.

Thanks,
Tom