linux-kernel - Re: [PATCH v5 0/4] Distinguish between variants of IBPB

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Message-ID: <173039500211.1507616.16831780895322741303.b4-ty@google.com>
Date: Thu, 31 Oct 2024 12:51:33 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, kvm@...r.kernel.org, 
	Jim Mattson <jmattson@...gle.com>
Cc: bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com, 
	jpoimboe@...nel.org, kai.huang@...el.com, linux-kernel@...r.kernel.org, 
	mingo@...hat.com, pawan.kumar.gupta@...ux.intel.com, pbonzini@...hat.com, 
	sandipan.das@....com, tglx@...utronix.de, x86@...nel.org
Subject: Re: [PATCH v5 0/4] Distinguish between variants of IBPB

On Fri, 11 Oct 2024 14:43:49 -0700, Jim Mattson wrote:
> Prior to Zen4, AMD's IBPB did not flush the RAS (or, in Intel
> terminology, the RSB). Hence, the older version of AMD's IBPB was not
> equivalent to Intel's IBPB. However, KVM has been treating them as
> equivalent, synthesizing Intel's CPUID.(EAX=7,ECX=0):EDX[bit 26] on any
> platform that supports the synthetic features X86_FEATURE_IBPB and
> X86_FEATURE_IBRS.
> 
> [...]

Applied to kvm-x86 misc, thanks!

[1/4] x86/cpufeatures: Clarify semantics of X86_FEATURE_IBPB
      https://github.com/kvm-x86/linux/commit/43801a0dbb38
[2/4] x86/cpufeatures: Define X86_FEATURE_AMD_IBPB_RET
      https://github.com/kvm-x86/linux/commit/99d252e3ae3e
[3/4] KVM: x86: Advertise AMD_IBPB_RET to userspace
      https://github.com/kvm-x86/linux/commit/df9328b0ef66
[4/4] KVM: x86: AMD's IBPB is not equivalent to Intel's IBPB
      https://github.com/kvm-x86/linux/commit/d66e266427e4

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