linux-kernel - Re: [PATCH 0/3] Unify IBRS virtualization

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Message-ID: <174559612575.886958.13255435526046364721.b4-ty@google.com>
Date: Fri, 25 Apr 2025 15:37:17 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, x86@...nel.org, Yosry Ahmed <yosry.ahmed@...ux.dev>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, 
	Paolo Bonzini <pbonzini@...hat.com>, Jim Mattson <jmattson@...gle.com>, 
	David Kaplan <David.Kaplan@....com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Unify IBRS virtualization

On Fri, 21 Feb 2025 16:33:49 +0000, Yosry Ahmed wrote:
> To properly virtualize IBRS on Intel, an IBPB is executed on emulated
> VM-exits to provide separate predictor modes for L1 and L2.
> 
> Similar handling is theoretically needed for AMD, unless IbrsSameMode is
> enumerated by the CPU (which should be the case for most/all CPUs
> anyway). For correctness and clarity, this series generalizes the
> handling to apply for both Intel and AMD as needed.
> 
> [...]

Applied to kvm-x86 misc, thanks!

[1/3] x86/cpufeatures: Define X86_FEATURE_AMD_IBRS_SAME_MODE
      commit: 9a7cb00a8ff7380a09fa75287a3f2642c472d562
[2/3] KVM: x86: Propagate AMD's IbrsSameMode to the guest
      commit: 65ca2872015c232d6743b497e3c08ff96596b917
[3/3] KVM: x86: Generalize IBRS virtualization on emulated VM-exit
      commit: 656d9624bd21d35499eaa5ee97fda6def62901c8

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