linux-kernel - Re: [PATCH] KVM/x86: pmu: Fix #GP condition check for RDPMC emulation

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Date:   Wed, 8 Jul 2020 08:45:20 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Like Xu <like.xu@...ux.intel.com>, kvm@...r.kernel.org,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM/x86: pmu: Fix #GP condition check for RDPMC emulation

On Wed, Jul 08, 2020 at 05:31:14PM +0200, Paolo Bonzini wrote:
> The order follows the SDM.  I'm tempted to remove the CR0 check
> altogether, since non-protected-mode always runs at CPL0 AFAIK, but let's
> keep it close to what the manual says.

Heh, it wouldn't surprise me in the least if there's a way to get the SS
arbyte to hold a non-zero DPL in real mode :-).