[PATCH v3 2/8] KVM:CPUID: Define CET CPUID bits and CR4.CET master enable bit.

From: Yang Weijiang <weijiang.yang@intel.com>
To: pbonzini@redhat.com, rkrcmar@redhat.com,
	sean.j.christopherson@intel.com, jmattson@google.com,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	mst@redhat.com, yu-cheng.yu@intel.com
Cc: Yang Weijiang <weijiang.yang@intel.com>,
	Zhang Yi Z <yi.z.zhang@linux.intel.com>
Subject: [PATCH v3 2/8] KVM:CPUID: Define CET CPUID bits and CR4.CET master enable bit.
Date: Mon, 25 Feb 2019 21:27:10 +0800	[thread overview]
Message-ID: <20190225132716.6982-3-weijiang.yang@intel.com> (raw)
In-Reply-To: <20190225132716.6982-1-weijiang.yang@intel.com>

Guest queries 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.
CR4.CET[bit 23] is CET master enable bit, it controls CET feature
availability in guest OS.

Note: Although SHSTK or IBT can be enabled independently,
      either of the features is controlled by CR4.CET.

Signed-off-by: Zhang Yi Z <yi.z.zhang@linux.intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
---
 arch/x86/include/asm/kvm_host.h | 3 ++-
 arch/x86/kvm/cpuid.c            | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 55e51ff7e421..df002936088f 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -90,7 +90,8 @@
 			  | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR | X86_CR4_PCIDE \
 			  | X86_CR4_OSXSAVE | X86_CR4_SMEP | X86_CR4_FSGSBASE \
 			  | X86_CR4_OSXMMEXCPT | X86_CR4_LA57 | X86_CR4_VMXE \
-			  | X86_CR4_SMAP | X86_CR4_PKE | X86_CR4_UMIP))
+			  | X86_CR4_SMAP | X86_CR4_PKE | X86_CR4_UMIP \
+			  | X86_CR4_CET))
 
 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
 
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 7bcfa61375c0..cb1aece25b17 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -406,12 +406,12 @@ 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) | F(IBT);
 
 	/* all calls to cpuid_count() should be made on the same cpu */
 	get_cpu();
-- 
2.17.1

