linux-kernel - Re: [PATCH] KVM: x86: Don't attempt to load PDPTRs when 64-bit mode is enabled

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]

Date:   Tue, 4 Aug 2020 12:09:49 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Jim Mattson <jmattson@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>, kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Oliver Upton <oupton@...gle.com>,
        Peter Shier <pshier@...gle.com>
Subject: Re: [PATCH] KVM: x86: Don't attempt to load PDPTRs when 64-bit mode
 is enabled

On Tue, Aug 04, 2020 at 11:46:58AM -0700, Jim Mattson wrote:
> On Tue, Aug 4, 2020 at 11:41 AM Sean Christopherson
> <sean.j.christopherson@...el.com> wrote:
> 
> > Ping.  This really needs to be in the initial pull for 5.9, as is kvm/queue
> > has a 100% fatality rate for me.
> 
> I agree completely, but I am curious what guest you have that toggles
> CD/NW in 64-bit mode.

It's my OVMF build.  I assume it's MTRR programming, but I haven't bothered
to debug that far.  Nor do I want to, the EDKII build framework makes my
head explode :-).