On Sun, Apr 24, 2022, Lei Wang wrote:
> From: Chenyi Qiang <chenyi.qiang@xxxxxxxxx>
>
> 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 domain.
>
> Two VMCS fields {HOST,GUEST}_IA32_PKRS are introduced in
> {host,guest}-state area to store the respective values of PKRS.
>
> Every VM exit saves PKRS into guest-state area.
Uber nit, PKRS isn't saved if VMX doesn't support the entry control.
Every VM exit saves PKRS into guest-state area if VM_ENTRY_LOAD_IA32_PKRS
is supported by the CPU.
With that tweak,
Reviewed-by: Sean Christopherson <seanjc@xxxxxxxxxx>
