linux-kernel - Re: [PATCH v4] KVM: emulate: Don't inject #GP when emulating RDMPC if CR0.PE=0

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] [day] [month] [year] [list]

Message-ID: <CANRm+CyrAbmS5_oWptUT3jWNfCe-DE7+C2WiE+b2_2VzUPpAig@mail.gmail.com>
Date:   Wed, 20 Oct 2021 18:15:54 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH v4] KVM: emulate: Don't inject #GP when emulating RDMPC if CR0.PE=0

On Wed, 20 Oct 2021 at 17:02, Paolo Bonzini <pbonzini@...hat.com> wrote:
>
> On 20/10/21 10:52, Wanpeng Li wrote:
> > From: Wanpeng Li<wanpengli@...cent.com>
> >
> > SDM mentioned that we should #GP for rdpmc if ECX is not valid or
> > (CR4.PCE is 0 and CPL is 1, 2, or 3 and CR0.PE is 1).
> >
> > Let's add the CR0.PE is 1 checking to rdpmc emulate, though this isn't
> > strictly necessary since it's impossible for CPL to be >0 if CR0.PE=0.
> >
> > Reviewed-by: Sean Christopherson<seanjc@...gle.com>
> > Signed-off-by: Wanpeng Li<wanpengli@...cent.com>
> > ---
> > v3 -> v4:
> >   * add comments instead of pseudocode
>
> No, the commit message was fine.  What I meant is there's no need to
> change the code.  Just add a comment about why CR0.PE isn't tested.

Just sent out a new version.

    Wanpeng