linux-kernel - Re: [PATCH v2] KVM: x86: Allow guests to see MSR_IA32_TSX

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Message-ID: <618c5513-5092-f7cd-b47b-933936001180@redhat.com>
Date:   Mon, 1 Feb 2021 10:08:22 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        jmattson@...gle.com, stable@...r.kernel.org
Subject: Re: [PATCH v2] KVM: x86: Allow guests to see MSR_IA32_TSX_CTRL even
 if tsx=off

On 01/02/21 09:46, Paolo Bonzini wrote:
>>
>> This comment be updated to call out the new TSX_CTRL behavior.
>>
>>     /*
>>      * On TAA affected systems:
>>      *      - nothing to do if TSX is disabled on the host.
>>      *      - we emulate TSX_CTRL if present on the host.
>>      *      This lets the guest use VERW to clear CPU buffers.
>>      */
> 
> Ok.

Hmm, but the comment is even more accurate now than before, isn't it? 
It said nothing about hiding TSX_CTRL, so now it matches the code below.

Paolo