linux-kernel - Re: [RFC PATCH 0/3] KVM: x86: Disallow writes to feature MSRs post-KVM

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Message-ID: <c2335a69-c243-3c5f-b983-938c91cb5c2c@redhat.com>
Date:   Wed, 10 Aug 2022 14:52:36 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Like Xu <like.xu.linux@...il.com>
Subject: Re: [RFC PATCH 0/3] KVM: x86: Disallow writes to feature MSRs
 post-KVM_RUN

On 8/5/22 19:29, Sean Christopherson wrote:
> Give feature MSRs that same treatment as CPUID and disallow changing said
> MSRs after KVM_RUN.
> 
> RFC as this is lightly tested and should come with a selftests update to
> verify it actually works.  Posting early to get feedback on the overall
> idea, and on the VMX MSRs trickery (though I think patches 1-2 are a good
> idea irrespective of trying to reduce the overhead of the new check).

They are good, just a small style remark on patch 2.

Paolo