linux-kernel - Re: [PATCH v10 01/50] KVM: SVM: INTERCEPT

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Message-ID: <359d7c57-2a71-419d-b63f-4c5610f48b0f@redhat.com>
Date:   Mon, 16 Oct 2023 17:14:38 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Michael Roth <michael.roth@....com>
Cc:     kvm@...r.kernel.org, linux-coco@...ts.linux.dev,
        linux-mm@...ck.org, linux-crypto@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        jroedel@...e.de, thomas.lendacky@....com, hpa@...or.com,
        ardb@...nel.org, seanjc@...gle.com, vkuznets@...hat.com,
        jmattson@...gle.com, luto@...nel.org, dave.hansen@...ux.intel.com,
        slp@...hat.com, pgonda@...gle.com, peterz@...radead.org,
        srinivas.pandruvada@...ux.intel.com, rientjes@...gle.com,
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        pankaj.gupta@....com, liam.merwick@...cle.com,
        zhi.a.wang@...el.com, stable@...r.kernel.org
Subject: Re: [PATCH v10 01/50] KVM: SVM: INTERCEPT_RDTSCP is never intercepted
 anyway

On 10/16/23 17:12, Greg KH wrote:
> On Mon, Oct 16, 2023 at 08:27:30AM -0500, Michael Roth wrote:
>> From: Paolo Bonzini <pbonzini@...hat.com>
>>
>> svm_recalc_instruction_intercepts() is always called at least once
>> before the vCPU is started, so the setting or clearing of the RDTSCP
>> intercept can be dropped from the TSC_AUX virtualization support.
>>
>> Extracted from a patch by Tom Lendacky.
>>
>> Cc: stable@...r.kernel.org
>> Fixes: 296d5a17e793 ("KVM: SEV-ES: Use V_TSC_AUX if available instead of RDTSC/MSR_TSC_AUX intercepts")
>> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
>> (cherry picked from commit e8d93d5d93f85949e7299be289c6e7e1154b2f78)
>> Signed-off-by: Michael Roth <michael.roth@....com>
>> ---
>>   arch/x86/kvm/svm/sev.c | 5 +----
>>   1 file changed, 1 insertion(+), 4 deletions(-)
> 
> What stable tree(s) are you wanting this applied to (same for the others
> in this series)?  It's already in the 6.1.56 release, and the Fixes tag
> is for 5.19, so I don't see where it could be missing from?

I tink it's missing in the (destined for 6.7) tree that Michael is 
basing this series on, so he's cherry picking it from Linus's tree.

Paolo