linux-kernel - [PATCH 1/2] x86/cpufeatures: Add AMD-specific IBRS bits

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Message-ID: <20230227210526.83182-2-itazur@amazon.com>
Date:   Mon, 27 Feb 2023 21:05:25 +0000
From:   Takahiro Itazuri <itazur@...zon.com>
To:     <kvm@...r.kernel.org>, <x86@...nel.org>
CC:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        <linux-kernel@...r.kernel.org>,
        "Takahiro Itazuri" <zulinx86@...il.com>,
        Takahiro Itazuri <itazur@...zon.com>
Subject: [PATCH 1/2] x86/cpufeatures: Add AMD-specific IBRS bits

AMD processors have some AMD-specific IBRS related bits in CPUID
Fn8000_0008_EBX (ref: AMD64 Architecture Programmer's Manual, Volume 3:
General-Purpose and System Instructions).

Signed-off-by: Takahiro Itazuri <itazur@...zon.com>
---
 arch/x86/include/asm/cpufeatures.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 8f39c46197b8..cd7245507745 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -324,7 +324,10 @@
 #define X86_FEATURE_AMD_IBPB		(13*32+12) /* "" Indirect Branch Prediction Barrier */
 #define X86_FEATURE_AMD_IBRS		(13*32+14) /* "" Indirect Branch Restricted Speculation */
 #define X86_FEATURE_AMD_STIBP		(13*32+15) /* "" Single Thread Indirect Branch Predictors */
+#define X86_FEATURE_AMD_IBRS_ALWAYS_ON	(13*32+16) /* "" Indirect Branch Restricted Speculation always-on preferred */
 #define X86_FEATURE_AMD_STIBP_ALWAYS_ON	(13*32+17) /* "" Single Thread Indirect Branch Predictors always-on preferred */
+#define X86_FEATURE_AMD_IBRS_PREFERRED	(13*32+18) /* "" Indirect Branch Restricted Speculation preferred over software */
+#define X86_FEATURE_AMD_IBRS_SAME_MODE	(13*32+19) /* "" Indirect Branch Restricted Speculation provides same mode protection */
 #define X86_FEATURE_AMD_PPIN		(13*32+23) /* Protected Processor Inventory Number */
 #define X86_FEATURE_AMD_SSBD		(13*32+24) /* "" Speculative Store Bypass Disable */
 #define X86_FEATURE_VIRT_SSBD		(13*32+25) /* Virtualized Speculative Store Bypass Disable */
-- 
2.38.0