linux-kernel - Re: [PATCH v4 12/12] KVM:SVM: Enable INVPCID feature on AMD

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Message-ID: <CALMp9eTa4TWVJj=i12WwyGCju_or-xnLpjxmJTu=KC9fq-XZJg@mail.gmail.com>
Date:   Mon, 10 Aug 2020 14:59:06 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Babu Moger <babu.moger@....com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        kvm list <kvm@...r.kernel.org>, Joerg Roedel <joro@...tes.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v4 12/12] KVM:SVM: Enable INVPCID feature on AMD

On Thu, Aug 6, 2020 at 5:47 PM Babu Moger <babu.moger@....com> wrote:
>
> The following intercept bit has been added to support VMEXIT
> for INVPCID instruction:
> Code    Name            Cause
> A2h     VMEXIT_INVPCID  INVPCID instruction
>
> The following bit has been added to the VMCB layout control area
> to control intercept of INVPCID:
> Byte Offset     Bit(s)    Function
> 14h             2         intercept INVPCID
>
> Enable the interceptions when the the guest is running with shadow
> page table enabled and handle the tlbflush based on the invpcid
> instruction type.
>
> For the guests with nested page table (NPT) support, the INVPCID
> feature works as running it natively. KVM does not need to do any
> special handling in this case.
>
> AMD documentation for INVPCID feature is available at "AMD64
> Architecture Programmer’s Manual Volume 2: System Programming,
> Pub. 24593 Rev. 3.34(or later)"
>
> The documentation can be obtained at the links below:
> Link: https://www.amd.com/system/files/TechDocs/24593.pdf
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537
>
> Signed-off-by: Babu Moger <babu.moger@....com>
Reviewed-by: Jim Mattson <jmattson@...gle.com>