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Message-ID: <20240823185323.2563194-4-jmattson@google.com>
Date: Fri, 23 Aug 2024 11:53:12 -0700
From: Jim Mattson <jmattson@...gle.com>
To: 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>, Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>,
Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, Josh Poimboeuf <jpoimboe@...nel.org>,
Jim Mattson <jmattson@...gle.com>, Sandipan Das <sandipan.das@....com>,
Kai Huang <kai.huang@...el.com>, x86@...nel.org, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org
Cc: Tom Lendacky <thomas.lendacky@....com>
Subject: [PATCH v3 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>
---
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 2617be544480..ec7b2ca3b4d3 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -751,7 +751,7 @@ 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)
);
/*
--
2.46.0.295.g3b9ea8a38a-goog
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