linux-kernel - [PATCH v5 3/4] KVM: x86: Advertise AMD_IBPB

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Message-ID: <20241011214353.1625057-4-jmattson@google.com>
Date: Fri, 11 Oct 2024 14:43:52 -0700
From: Jim Mattson <jmattson@...gle.com>
To: kvm@...r.kernel.org
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, seanjc@...gle.com, tglx@...utronix.de, x86@...nel.org, 
	Jim Mattson <jmattson@...gle.com>, Tom Lendacky <thomas.lendacky@....com>
Subject: [PATCH v5 3/4] KVM: x86: Advertise AMD_IBPB_RET to userspace

This is an inherent feature of IA32_PRED_CMD[0], so it is trivially
virtualizable (as long as IA32_PRED_CMD[0] is virtualized).

Suggested-by: Tom Lendacky <thomas.lendacky@....com>
Signed-off-by: Jim Mattson <jmattson@...gle.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@....com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kvm/cpuid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 41786b834b16..53112669be00 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -755,7 +755,7 @@ void kvm_set_cpu_caps(void)
 		F(CLZERO) | F(XSAVEERPTR) |
 		F(WBNOINVD) | F(AMD_IBPB) | F(AMD_IBRS) | F(AMD_SSBD) | F(VIRT_SSBD) |
 		F(AMD_SSB_NO) | F(AMD_STIBP) | F(AMD_STIBP_ALWAYS_ON) |
-		F(AMD_PSFD)
+		F(AMD_PSFD) | F(AMD_IBPB_RET)
 	);
 
 	/*
-- 
2.47.0.rc1.288.g06298d1525-goog