Re: [RFC 1/7] KVM: VMX: Introduce PKS VMCS fields

[Jim Mattson]

On Fri, Aug 7, 2020 at 1:46 AM Chenyi Qiang <chenyi.qiang@xxxxxxxxx> wrote:
>
> PKS(Protection Keys for Supervisor Pages) is a feature that extends the
> Protection Key architecture to support thread-specific permission
> restrictions on supervisor pages.
>
> A new PKS MSR(PKRS) is defined in kernel to support PKS, which holds a
> set of permissions associated with each protection domian.
>
> Two VMCS fields {HOST,GUEST}_IA32_PKRS are introduced in
> {host,guest}-state area to store the value of PKRS.
>
> Every VM exit saves PKRS into guest-state area.
> If VM_EXIT_LOAD_IA32_PKRS = 1, VM exit loads PKRS from the host-state
> area.
> If VM_ENTRY_LOAD_IA32_PKRS = 1, VM entry loads PKRS from the guest-state
> area.
>
> Signed-off-by: Chenyi Qiang <chenyi.qiang@xxxxxxxxx>
Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>