[PATCH 1/7] KVM: x86: add SPEC_CTRL and IBPB_SUPPORT accessors

From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: jmattson@google.com, aliguori@amazon.com,
	thomas.lendacky@amd.com, dwmw@amazon.co.uk, bp@alien8.de
Subject: [PATCH 1/7] KVM: x86: add SPEC_CTRL and IBPB_SUPPORT accessors
Date: Mon,  8 Jan 2018 19:08:39 +0100	[thread overview]
Message-ID: <1515434925-10250-2-git-send-email-pbonzini@redhat.com> (raw)
In-Reply-To: <1515434925-10250-1-git-send-email-pbonzini@redhat.com>

As an interim measure until SPEC_CTRL is supported by upstream
Linux in cpufeatures, add a function that lets vmx.c and svm.c
know whether to save/restore MSR_IA32_SPEC_CTRL.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/kvm/cpuid.c |  3 ---
 arch/x86/kvm/cpuid.h | 22 ++++++++++++++++++++++
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 8e9a07c557f1..767af697c20c 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -67,9 +67,6 @@ u64 kvm_supported_xcr0(void)
 
 #define F(x) bit(X86_FEATURE_##x)
 
-/* These are scattered features in cpufeatures.h. */
-#define KVM_CPUID_BIT_AVX512_4VNNIW     2
-#define KVM_CPUID_BIT_AVX512_4FMAPS     3
 #define KF(x) bit(KVM_CPUID_BIT_##x)
 
 int kvm_update_cpuid(struct kvm_vcpu *vcpu)
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index c2cea6651279..8d04ccf177ce 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -155,6 +155,28 @@ static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
 	return x86_stepping(best->eax);
 }
 
+/* These are scattered features in cpufeatures.h. */
+#define KVM_CPUID_BIT_AVX512_4VNNIW	2
+#define KVM_CPUID_BIT_AVX512_4FMAPS	3
+#define KVM_CPUID_BIT_SPEC_CTRL		26
+#define KVM_CPUID_BIT_STIBP		27
+
+/* CPUID[eax=0x80000008].ebx */
+#define KVM_CPUID_BIT_IBPB_SUPPORT	12
+
+static inline bool cpu_has_spec_ctrl(void)
+{
+	u32 eax, ebx, ecx, edx;
+	cpuid_count(7, 0, &eax, &ebx, &ecx, &edx);
+
+	return edx & bit(KVM_CPUID_BIT_SPEC_CTRL);
+}
+
+static inline bool cpu_has_ibpb_support(void)
+{
+	return cpuid_ebx(0x80000008) & bit(KVM_CPUID_BIT_IBPB_SUPPORT);
+}
+
 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
 {
 	return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
-- 
1.8.3.1
