linux-kernel - Re: [PATCH v2 0/2] KVM: SVM: Handle EferLmsleUnsupported

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Message-ID: <176097608821.439830.10295341588067424162.b4-ty@google.com>
Date: Mon, 20 Oct 2025 09:33:07 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, Tom Lendacky <thomas.lendacky@....com>, 
	Perry Yuan <perry.yuan@....com>, Sohil Mehta <sohil.mehta@...el.com>, 
	"Xin Li (Intel)" <xin@...or.com>, Joerg Roedel <joerg.roedel@....com>, Avi Kivity <avi@...hat.com>, 
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, 
	Yosry Ahmed <yosry.ahmed@...ux.dev>, Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH v2 0/2] KVM: SVM: Handle EferLmsleUnsupported

On Tue, 30 Sep 2025 17:14:06 -0700, Jim Mattson wrote:
> It is no longer the case that EFER.LMSLE is supported by all SVM-capable
> processors. AMD enumerates the absence of this feature by CPUID
> Fn8000_0008_EBX[EferLmlseUnsupported](bit 20)=1.
> 
> Advertise this defeature bit to userspace via KVM_GET_SUPPORTED_CPUID,
> and don't allow a guest to set EFER.LMSLE on hardware that doesn't
> support the feature.
> 
> [...]

Applied to kvm-x86 svm, thanks!

[1/2] KVM: x86: Advertise EferLmsleUnsupported to userspace
      https://github.com/kvm-x86/linux/commit/4793f990ea15
[2/2] KVM: SVM: Disallow EFER.LMSLE when not supported by hardware
      https://github.com/kvm-x86/linux/commit/c53c632592a4

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