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References: <20191211204753.242298-1-pomonis@google.com> <20191211204753.242298-13-pomonis@google.com>
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From:   Jim Mattson <jmattson@google.com>
Date:   Mon, 6 Jan 2020 12:19:30 -0800
Message-ID: <CALMp9eS+8kwmTyYDieNkhbRMBW-rkphKh4fmtV3X2d9XVh3U8Q@mail.gmail.com>
Subject: Re: [PATCH v2 12/13] KVM: x86: Protect DR-based index computations
 from Spectre-v1/L1TF attacks
To:     Marios Pomonis <pomonis@google.com>
Cc:     Paolo Bonzini <pbonzini@redhat.com>,
        =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Joerg Roedel <joro@8bytes.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        kvm list <kvm@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Nick Finco <nifi@google.com>, Andrew Honig <ahonig@google.com>,
        stable@vger.kernel.org
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On Wed, Dec 11, 2019 at 12:49 PM Marios Pomonis <pomonis@google.com> wrote:
>
> This fixes a Spectre-v1/L1TF vulnerability in __kvm_set_dr() and
> kvm_get_dr().
> Both kvm_get_dr() and kvm_set_dr() (a wrapper of __kvm_set_dr()) are
> exported symbols so KVM should tream them conservatively from a security
> perspective.
>
> Fixes: commit 020df0794f57 ("KVM: move DR register access handling into generic code")
>
> Signed-off-by: Nick Finco <nifi@google.com>
> Signed-off-by: Marios Pomonis <pomonis@google.com>
> Reviewed-by: Andrew Honig <ahonig@google.com>
> Cc: stable@vger.kernel.org

Reviewed-by: Jim Mattson <jmattson@google.com>