linux-kernel - Re: [PATCH v3 0/2] KVM: SVM: Fix a bug where TSC

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Message-ID: <175873605243.2144113.4486198413338077399.b4-ty@google.com>
Date: Wed, 24 Sep 2025 11:07:43 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Hou Wenlong <houwenlong.hwl@...group.com>, Xiaoyao Li <xiaoyao.li@...el.com>, 
	Lai Jiangshan <jiangshan.ljs@...group.com>
Subject: Re: [PATCH v3 0/2] KVM: SVM: Fix a bug where TSC_AUX can get clobbered

On Tue, 23 Sep 2025 08:37:36 -0700, Sean Christopherson wrote:
> Fix a bug where an SEV-ES vCPU running on the same pCPU as a non-SEV-ES vCPU
> could clobber TSC_AUX due to loading the host's TSC_AUX on #VMEXIT, as opposed
> to restoring whatever was in hardware at the time of VMRUN.
> 
> v3:
>  - Collect reviews. [Xiaoyao]
>  - Make tsc_aux_uret_slot globally visible instead of passing it as a param.
>    [Xiaoyao]
>  - Mark tsc_aux_uret_slot __ro_after_init.
> 
> [...]

Applied to kvm-x86 svm, thanks!

[1/2] KVM: x86: Add helper to retrieve current value of user return MSR
      https://github.com/kvm-x86/linux/commit/9bc366350734
[2/2] KVM: SVM: Re-load current, not host, TSC_AUX on #VMEXIT from SEV-ES guest
      https://github.com/kvm-x86/linux/commit/29da8c823abf

--
https://github.com/kvm-x86/linux/tree/next