linux-kernel - [PATCH v11 9/9] KVM: X86: Set CET feature bits for CPUID enumeration

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Date:   Thu, 26 Mar 2020 16:18:46 +0800
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, sean.j.christopherson@...el.com,
        jmattson@...gle.com
Cc:     yu.c.zhang@...ux.intel.com, Yang Weijiang <weijiang.yang@...el.com>
Subject: [PATCH v11 9/9] KVM: X86: Set CET feature bits for CPUID enumeration

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

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 2c944ad99692..5109c43c6981 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 25e9a11291b3..26ab959df92f 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -366,6 +366,10 @@ 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