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

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Message-ID: <20200804190949.GA25586@linux.intel.com>
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 :-).