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

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Message-ID: <CALMp9eSse8jkSC2B=7s7jbtQ1gnOgZokuhDgeu3-E93pi+g+Xg@mail.gmail.com>
Date:   Mon, 10 Aug 2020 16:17:06 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Chenyi Qiang <chenyi.qiang@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>,
        Xiaoyao Li <xiaoyao.li@...el.com>,
        kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 1/7] KVM: VMX: Introduce PKS VMCS fields

On Fri, Aug 7, 2020 at 1:46 AM Chenyi Qiang <chenyi.qiang@...el.com> 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@...el.com>
Reviewed-by: Jim Mattson <jmattson@...gle.com>