diff options
| author | Sean Christopherson <seanjc@google.com> | 2021-04-12 16:21:36 +1200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-04-20 04:18:54 -0400 |
| commit | 01de8682b32d3ed4f0136f7379e1e3ae2e563308 (patch) | |
| tree | cdc0e3ea7624771619e055e6fb8751d6960ff875 | |
| parent | 4e66c0cb79b732b01b82e094b21b8e22a20dff83 (diff) | |
KVM: x86: Add reverse-CPUID lookup support for scattered SGX features
Define a new KVM-only feature word for advertising and querying SGX
sub-features in CPUID.0x12.0x0.EAX. Because SGX1 and SGX2 are scattered
in the kernel's feature word, they need to be translated so that the
bit numbers match those of hardware.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Kai Huang <kai.huang@intel.com>
Message-Id: <e797c533f4c71ae89265bbb15a02aef86b67cbec.1618196135.git.kai.huang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/cpuid.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h index 315fa45eb7c8..888e88b42e8d 100644 --- a/arch/x86/kvm/cpuid.h +++ b/arch/x86/kvm/cpuid.h @@ -13,12 +13,17 @@ * "bug" caps, but KVM doesn't use those. */ enum kvm_only_cpuid_leafs { - NR_KVM_CPU_CAPS = NCAPINTS, + CPUID_12_EAX = NCAPINTS, + NR_KVM_CPU_CAPS, NKVMCAPINTS = NR_KVM_CPU_CAPS - NCAPINTS, }; -#define X86_KVM_FEATURE(w, f) ((w)*32 + (f)) +#define KVM_X86_FEATURE(w, f) ((w)*32 + (f)) + +/* Intel-defined SGX sub-features, CPUID level 0x12 (EAX). */ +#define KVM_X86_FEATURE_SGX1 KVM_X86_FEATURE(CPUID_12_EAX, 0) +#define KVM_X86_FEATURE_SGX2 KVM_X86_FEATURE(CPUID_12_EAX, 1) extern u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly; void kvm_set_cpu_caps(void); @@ -93,6 +98,7 @@ static const struct cpuid_reg reverse_cpuid[] = { [CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX}, [CPUID_7_EDX] = { 7, 0, CPUID_EDX}, [CPUID_7_1_EAX] = { 7, 1, CPUID_EAX}, + [CPUID_12_EAX] = {0x00000012, 0, CPUID_EAX}, }; /* @@ -119,6 +125,11 @@ static __always_inline void reverse_cpuid_check(unsigned int x86_leaf) */ static __always_inline u32 __feature_translate(int x86_feature) { + if (x86_feature == X86_FEATURE_SGX1) + return KVM_X86_FEATURE_SGX1; + else if (x86_feature == X86_FEATURE_SGX2) + return KVM_X86_FEATURE_SGX2; + return x86_feature; } |