linux-kernel - Re: [PATCH v7 1/8] KVM: VMX: Introduce PKS VMCS fields

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Date:   Tue, 24 May 2022 20:55:55 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Lei Wang <lei4.wang@...el.com>
Cc:     pbonzini@...hat.com, vkuznets@...hat.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org, chenyi.qiang@...el.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 1/8] KVM: VMX: Introduce PKS VMCS fields

On Sun, Apr 24, 2022, Lei Wang wrote:
> From: Chenyi Qiang <chenyi.qiang@...el.com>
> 
> 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@...gle.com>