linux-kernel - Re: [RFC PATCH v6 31/32] x86/sev: Prevent SECURE_AVIC_CONTROL MSR interception for Secure AVIC guests

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Message-ID: <CAMvTesCSX1g8Ttzjn4PhfcWSYUdAcCUV9hfJd_TPQzek24K1LA@mail.gmail.com>
Date: Mon, 9 Jun 2025 15:40:19 +0800
From: Tianyu Lan <ltykernel@...il.com>
To: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
Cc: linux-kernel@...r.kernel.org, bp@...en8.de, tglx@...utronix.de, 
	mingo@...hat.com, dave.hansen@...ux.intel.com, Thomas.Lendacky@....com, 
	nikunj@....com, Santosh.Shukla@....com, Vasant.Hegde@....com, 
	Suravee.Suthikulpanit@....com, David.Kaplan@....com, x86@...nel.org, 
	hpa@...or.com, peterz@...radead.org, seanjc@...gle.com, pbonzini@...hat.com, 
	kvm@...r.kernel.org, kirill.shutemov@...ux.intel.com, huibo.wang@....com, 
	naveen.rao@....com, francescolavra.fl@...il.com, tiala@...rosoft.com
Subject: Re: [RFC PATCH v6 31/32] x86/sev: Prevent SECURE_AVIC_CONTROL MSR
 interception for Secure AVIC guests

On Wed, May 14, 2025 at 3:33 PM Neeraj Upadhyay <Neeraj.Upadhyay@....com> wrote:
>
> The SECURE_AVIC_CONTROL MSR holds the GPA of the guest APIC backing
> page and bitfields to control enablement of Secure AVIC and NMI by
> guest vCPUs. This MSR is populated by the guest and the hypervisor
> should not intercept it. A #VC exception will be generated otherwise.
> If this occurs and Secure AVIC is enabled, terminate guest execution.
>
> Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
> ---

Reviewed-by: Tianyu Lan <tiala@...rosoft.com>

-- 
Thanks
Tianyu Lan