linux-kernel - Re: [PATCH v6 1/7] KVM: VMX: Introduce PKS VMCS fields

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Message-ID: <YkS398j08ZuXQgUx@google.com>
Date:   Wed, 30 Mar 2022 20:05:11 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Chenyi Qiang <chenyi.qiang@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Xiaoyao Li <xiaoyao.li@...el.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/7] KVM: VMX: Introduce PKS VMCS fields

On Mon, Feb 21, 2022, Chenyi Qiang 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 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.
> 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@...el.com>
> Reviewed-by: Jim Mattson <jmattson@...gle.com>
> ---

Reviewed-by: Sean Christopherson <seanjc@...gle.com>