CPUID_8000_0007_EDX may come handy when X86_FEATURE_CONSTANT_TSC
needs to be checked.
No functional change intended.
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
arch/x86/kvm/cpuid.c | 4 ++++
arch/x86/kvm/reverse_cpuid.h | 9 ++++++++-
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 75dcf7a72605..f68b14053c9b 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -669,6 +669,10 @@ void kvm_set_cpu_caps(void)
if (!tdp_enabled && IS_ENABLED(CONFIG_X86_64))
kvm_cpu_cap_set(X86_FEATURE_GBPAGES);
+ kvm_cpu_cap_init_scattered(CPUID_8000_0007_EDX,
+ SF(CONSTANT_TSC)
+ );
+
kvm_cpu_cap_mask(CPUID_8000_0008_EBX,
F(CLZERO) | F(XSAVEERPTR) |
F(WBNOINVD) | F(AMD_IBPB) | F(AMD_IBRS) | F(AMD_SSBD) | F(VIRT_SSBD) |
diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h
index a19d473d0184..a5514c89dc29 100644
--- a/arch/x86/kvm/reverse_cpuid.h
+++ b/arch/x86/kvm/reverse_cpuid.h
@@ -12,7 +12,8 @@
* "bug" caps, but KVM doesn't use those.
*/
enum kvm_only_cpuid_leafs {
- CPUID_12_EAX = NCAPINTS,
+ CPUID_12_EAX = NCAPINTS,
+ CPUID_8000_0007_EDX = NCAPINTS + 1,
NR_KVM_CPU_CAPS,
NKVMCAPINTS = NR_KVM_CPU_CAPS - NCAPINTS,
@@ -24,6 +25,9 @@ enum kvm_only_cpuid_leafs {
#define KVM_X86_FEATURE_SGX1 KVM_X86_FEATURE(CPUID_12_EAX, 0)
#define KVM_X86_FEATURE_SGX2 KVM_X86_FEATURE(CPUID_12_EAX, 1)
+/* CPUID level 0x80000007 (EDX). */
+#define KVM_X86_FEATURE_CONSTANT_TSC KVM_X86_FEATURE(CPUID_8000_0007_EDX, 8)
+
struct cpuid_reg {
u32 function;
u32 index;
@@ -48,6 +52,7 @@ static const struct cpuid_reg reverse_cpuid[] = {
[CPUID_7_1_EAX] = { 7, 1, CPUID_EAX},
[CPUID_12_EAX] = {0x00000012, 0, CPUID_EAX},
[CPUID_8000_001F_EAX] = {0x8000001f, 0, CPUID_EAX},
+ [CPUID_8000_0007_EDX] = {0x80000007, 0, CPUID_EDX},
};
/*
@@ -78,6 +83,8 @@ static __always_inline u32 __feature_translate(int x86_feature)
return KVM_X86_FEATURE_SGX1;
else if (x86_feature == X86_FEATURE_SGX2)
return KVM_X86_FEATURE_SGX2;
+ else if (x86_feature == X86_FEATURE_CONSTANT_TSC)
+ return KVM_X86_FEATURE_CONSTANT_TSC;
return x86_feature;
}
--
2.37.2
