linux-kernel - [PATCH v10 8/8] KVM: X86: Set CET feature bits for CPUID enumeration

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Message-Id: <20200320034342.26610-9-weijiang.yang@intel.com>
Date:   Fri, 20 Mar 2020 11:43:41 +0800
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        sean.j.christopherson@...el.com, pbonzini@...hat.com,
        jmattson@...gle.com
Cc:     yu.c.zhang@...ux.intel.com, Yang Weijiang <weijiang.yang@...el.com>
Subject: [PATCH v10 8/8] KVM: X86: Set CET feature bits for CPUID enumeration

Set the feature bits so that CET capabilities can be see
in guest via CPUID enumeration. Add CR4.CET bit support
in order to allow guest set CET master control bit.

Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
---
 arch/x86/include/asm/kvm_host.h | 3 ++-
 arch/x86/kvm/cpuid.c            | 4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 24c90ea5ddbd..3b6dba7e610e 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -95,7 +95,8 @@
 			  | 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 71703d9277ee..9e19775c4105 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -363,6 +363,10 @@ void kvm_set_cpu_caps(void)
 		kvm_cpu_cap_set(X86_FEATURE_INTEL_STIBP);
 	if (boot_cpu_has(X86_FEATURE_AMD_SSBD))
 		kvm_cpu_cap_set(X86_FEATURE_SPEC_CTRL_SSBD);
+	if (boot_cpu_has(X86_FEATURE_IBT))
+		kvm_cpu_cap_set(X86_FEATURE_IBT);
+	if (boot_cpu_has(X86_FEATURE_SHSTK))
+		kvm_cpu_cap_set(X86_FEATURE_SHSTK);
 
 	kvm_cpu_cap_mask(CPUID_7_1_EAX,
 		F(AVX512_BF16)
-- 
2.17.2