From: Jim Mattson <jmattson@google.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Jim Mattson <jmattson@google.com>,
Sandipan Das <sandipan.das@amd.com>,
Kai Huang <kai.huang@intel.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Subject: [PATCH v3 3/4] KVM: x86: Advertise AMD_IBPB_RET to userspace
Date: Fri, 23 Aug 2024 11:53:12 -0700 [thread overview]
Message-ID: <20240823185323.2563194-4-jmattson@google.com> (raw)
In-Reply-To: <20240823185323.2563194-1-jmattson@google.com>
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@amd.com>
Signed-off-by: Jim Mattson <jmattson@google.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
next prev parent reply other threads:[~2024-08-23 18:53 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-23 18:53 [PATCH v3 0/4] Distinguish between variants of IBPB Jim Mattson
2024-08-23 18:53 ` [PATCH v3 1/4] x86/cpufeatures: Clarify semantics of X86_FEATURE_IBPB Jim Mattson
2024-08-26 20:33 ` Pawan Gupta
2024-08-26 20:59 ` Jim Mattson
2024-08-26 22:28 ` Pawan Gupta
2024-08-23 18:53 ` [PATCH v3 2/4] x86/cpufeatures: Define X86_FEATURE_AMD_IBPB_RET Jim Mattson
2024-08-23 18:53 ` Jim Mattson [this message]
2024-08-23 18:53 ` [PATCH v3 4/4] KVM: x86: AMD's IBPB is not equivalent to Intel's IBPB Jim Mattson
2024-08-23 19:40 ` Tom Lendacky
2024-08-23 20:51 ` Sean Christopherson
2024-08-23 22:00 ` Jim Mattson
2024-08-23 22:12 ` Tom Lendacky
2024-08-23 22:48 ` Jim Mattson
2024-08-23 23:49 ` Jim Mattson
2024-08-29 0:21 ` Sean Christopherson
2024-08-23 19:41 ` [PATCH v3 0/4] Distinguish between variants of IBPB Tom Lendacky
2024-08-25 12:17 ` Thomas Gleixner
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