linux-kernel - [PATCH v1 8/8] kvm:cpuid Report CET SHSTK and IBT support in CPUID.(EAX=0x7,ECX=0).

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Date:   Wed, 26 Dec 2018 16:15:32 +0800
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     pbonzini@...hat.com, rkrcmar@...hat.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org, mst@...hat.com,
        yu-cheng.yu@...el.com, yi.z.zhang@...el.com, hjl.tools@...il.com
Cc:     Yang Weijiang <weijiang.yang@...el.com>,
        Zhang Yi Z <yi.z.zhang@...ux.intel.com>
Subject: [PATCH v1 8/8] kvm:cpuid  Report CET SHSTK and IBT support in CPUID.(EAX=0x7,ECX=0).

Guest OS can query CET SHSTK and IBT support by CPUID.(EAX=0x7,ECX=0),
in return, ECX[bit 7] corresponds to SHSTK feature, and EDX[bit 20]
corresponds to IBT feature.

Signed-off-by: Zhang Yi Z <yi.z.zhang@...ux.intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
---
 arch/x86/kvm/cpuid.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 55c282f71f93..d7b60b3c4326 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -67,6 +67,8 @@ u64 kvm_supported_xcr0(void)
 
 #define F(x) bit(X86_FEATURE_##x)
 
+#define CET_IBT_BIT bit(20)
+
 /* For scattered features from cpufeatures.h; we currently expose none */
 #define KF(x) bit(KVM_CPUID_BIT_##x)
 
@@ -407,12 +409,12 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 		F(AVX512VBMI) | F(LA57) | F(PKU) | 0 /*OSPKE*/ |
 		F(AVX512_VPOPCNTDQ) | F(UMIP) | F(AVX512_VBMI2) | F(GFNI) |
 		F(VAES) | F(VPCLMULQDQ) | F(AVX512_VNNI) | F(AVX512_BITALG) |
-		F(CLDEMOTE);
+		F(CLDEMOTE) | F(SHSTK);
 
 	/* cpuid 7.0.edx*/
 	const u32 kvm_cpuid_7_0_edx_x86_features =
 		F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) |
-		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES);
+		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | CET_IBT_BIT;
 
 	/* all calls to cpuid_count() should be made on the same cpu */
 	get_cpu();
-- 
2.17.1