linux-kernel - Re: [PATCH 4/5] KVM: x86: WARN if writes to PAT MSR are handled by common KVM code

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Message-ID: <ZFLwWtDTaiyxdjMV@google.com>
Date:   Wed, 3 May 2023 16:38:02 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Kai Huang <kai.huang@...el.com>
Cc:     "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "guoke@...ontech.com" <guoke@...ontech.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "haiwenyao@...ontech.com" <haiwenyao@...ontech.com>
Subject: Re: [PATCH 4/5] KVM: x86: WARN if writes to PAT MSR are handled by
 common KVM code

On Wed, May 03, 2023, Kai Huang wrote:
> On Wed, 2023-05-03 at 11:28 -0700, Sean Christopherson wrote:
> > WARN and continue if a write to the PAT MSR reaches kvm_set_msr_common()
> > now that both VMX and SVM handle PAT writes entirely on their own.  Keep
> > the case statement with a WARN instead of dropping it entirely to document
> > why KVM's handling of reads and writes isn't symmetrical (reads are still
> > handled by kvm_get_msr_common().
> 
> Why not just merge this patch with the next one?

Hmm, good question.  IIRC, I originally had the last patch delete the case
statement and so wanted a bisection point, but I agree that having this as a
standalone patch is silly.  I'll squash it with patch 5 in v2.

Thanks!