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

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Date:   Mon, 16 Oct 2023 10:21:48 -0500
From:   Michael Roth <michael.roth@....com>
To:     Paolo Bonzini <pbonzini@...hat.com>
CC:     Greg KH <gregkh@...uxfoundation.org>, <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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        <nikunj.dadhania@....com>, <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 Mon, Oct 16, 2023 at 05:14:38PM +0200, Paolo Bonzini wrote:
> 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.

Yes, this and PATCH #2 are both prereqs that have already been applied
upstream, and are only being included in this series because they are
preqs for PATCH #3 which is new. Sorry for any confusion.

-Mike

> 
> Paolo
>