linux-kernel - Re: [PATCH v2 13/28] KVM: VMX: Get rid of eVMCS specific VMX controls sanitization

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Message-ID: <YsYMPCr3/ig0xPFj@google.com>
Date:   Wed, 6 Jul 2022 22:27:08 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Anirudh Rayabharam <anrayabh@...ux.microsoft.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 13/28] KVM: VMX: Get rid of eVMCS specific VMX
 controls sanitization

On Wed, Jun 29, 2022, Vitaly Kuznetsov wrote:
> With the updated eVMCSv1 definition, there's no known 'problematic'
> controls which are exposed in VMX control MSRs but are not present in
> eVMCSv1. Get rid of the filtering.

Ah, this patch is confusing until one realizes that this is dropping the "filtering"
for what controls/features _KVM_ uses, whereas nested_evmcs_filter_control_msr()
filters controls that are presented to L1.

Can you add something to clarify that in the changelog?