linux-kernel - Re: [PATCH v2 22/28] KVM: VMX: Clear controls obsoleted by EPT at runtime, not setup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CALMp9eRA0v6BK6KG81ZE_iLKF6VNXxemN=E4gAE4AM-V4gkdHQ@mail.gmail.com>
Date:   Fri, 1 Jul 2022 09:11:11 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Anirudh Rayabharam <anrayabh@...ux.microsoft.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 22/28] KVM: VMX: Clear controls obsoleted by EPT at
 runtime, not setup

On Wed, Jun 29, 2022 at 8:07 AM Vitaly Kuznetsov <vkuznets@...hat.com> wrote:
>
> From: Sean Christopherson <seanjc@...gle.com>
>
> Clear the CR3 and INVLPG interception controls at runtime based on
> whether or not EPT is being _used_, as opposed to clearing the bits at
> setup if EPT is _supported_ in hardware, and then restoring them when EPT
> is not used.  Not mucking with the base config will allow using the base
> config as the starting point for emulating the VMX capability MSRs.
>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Nit: These controls aren't "obsoleted" by EPT; they're just no longer required.

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