@@ -94,6 +94,16 @@ u32 xstate_required_size(u64 xstate_bv, bool compacted)
F(name); \
})
+/*
+ * Emulated Feature - For features that KVM emulates in software irrespective
+ * of host CPU/kernel support.
+ */
+#define EMUL_F(name) \
+({ \
+ kvm_cpu_cap_emulated |= F(name); \
+ F(name); \
+})
+
/*
* Aliased Features - For features in 0x8000_0001.EDX that are duplicates of
* identical 0x1.EDX features, and thus are aliased from 0x1 to 0x8000_0001.
@@ -649,6 +659,7 @@ do { \
do { \
const struct cpuid_reg cpuid = x86_feature_cpuid(leaf * 32); \
const u32 __maybe_unused kvm_cpu_cap_init_in_progress = leaf; \
+ u32 kvm_cpu_cap_emulated = 0; \
\
if (leaf < NCAPINTS) \
kvm_cpu_caps[leaf] &= (mask); \
@@ -656,6 +667,7 @@ do { \
kvm_cpu_caps[leaf] = (mask); \
\
kvm_cpu_caps[leaf] &= raw_cpuid_get(cpuid); \
+ kvm_cpu_caps[leaf] |= kvm_cpu_cap_emulated; \
} while (0)
/*
@@ -684,12 +696,10 @@ void kvm_set_cpu_caps(void)
0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
F(FMA) | F(CX16) | 0 /* xTPR Update */ | F(PDCM) |
F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) |
- F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
+ F(XMM4_2) | EMUL_F(X2APIC) | F(MOVBE) | F(POPCNT) |
0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) |
F(F16C) | F(RDRAND)
);
- /* KVM emulates x2apic in software irrespective of host support. */
- kvm_cpu_cap_set(X86_FEATURE_X2APIC);
kvm_cpu_cap_init(CPUID_1_EDX,
F(FPU) | F(VME) | F(DE) | F(PSE) |
@@ -703,13 +713,13 @@ void kvm_set_cpu_caps(void)
);
kvm_cpu_cap_init(CPUID_7_0_EBX,
- F(FSGSBASE) | F(SGX) | F(BMI1) | F(HLE) | F(AVX2) |
- F(FDP_EXCPTN_ONLY) | F(SMEP) | F(BMI2) | F(ERMS) | F(INVPCID) |
- F(RTM) | F(ZERO_FCS_FDS) | 0 /*MPX*/ | F(AVX512F) |
- F(AVX512DQ) | F(RDSEED) | F(ADX) | F(SMAP) | F(AVX512IFMA) |
- F(CLFLUSHOPT) | F(CLWB) | 0 /*INTEL_PT*/ | F(AVX512PF) |
- F(AVX512ER) | F(AVX512CD) | F(SHA_NI) | F(AVX512BW) |
- F(AVX512VL));
+ F(FSGSBASE) | EMUL_F(TSC_ADJUST) | F(SGX) | F(BMI1) | F(HLE) |
+ F(AVX2) | F(FDP_EXCPTN_ONLY) | F(SMEP) | F(BMI2) | F(ERMS) |
+ F(INVPCID) | F(RTM) | F(ZERO_FCS_FDS) | 0 /*MPX*/ |
+ F(AVX512F) | F(AVX512DQ) | F(RDSEED) | F(ADX) | F(SMAP) |
+ F(AVX512IFMA) | F(CLFLUSHOPT) | F(CLWB) | 0 /*INTEL_PT*/ |
+ F(AVX512PF) | F(AVX512ER) | F(AVX512CD) | F(SHA_NI) |
+ F(AVX512BW) | F(AVX512VL));
kvm_cpu_cap_init(CPUID_7_ECX,
F(AVX512VBMI) | RAW_F(LA57) | F(PKU) | 0 /*OSPKE*/ | F(RDPID) |
@@ -728,16 +738,12 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_init(CPUID_7_EDX,
F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) |
- F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) |
+ F(SPEC_CTRL_SSBD) | EMUL_F(ARCH_CAPABILITIES) | F(INTEL_STIBP) |
F(MD_CLEAR) | F(AVX512_VP2INTERSECT) | F(FSRM) |
F(SERIALIZE) | F(TSXLDTRK) | F(AVX512_FP16) |
F(AMX_TILE) | F(AMX_INT8) | F(AMX_BF16) | F(FLUSH_L1D)
);
- /* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */
- kvm_cpu_cap_set(X86_FEATURE_TSC_ADJUST);
- kvm_cpu_cap_set(X86_FEATURE_ARCH_CAPABILITIES);
-
if (boot_cpu_has(X86_FEATURE_IBPB) && boot_cpu_has(X86_FEATURE_IBRS))
kvm_cpu_cap_set(X86_FEATURE_SPEC_CTRL);
if (boot_cpu_has(X86_FEATURE_STIBP))
Now that kvm_cpu_cap_init() is a macro with its own scope, add EMUL_F() to OR-in features that KVM emulates in software, i.e. that don't depend on the feature being available in hardware. The contained scope of kvm_cpu_cap_init() allows using a local variable to track the set of emulated leaves, which in addition to avoiding confusing and/or unnecessary variables, helps prevent misuse of EMUL_F(). Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/x86/kvm/cpuid.c | 36 +++++++++++++++++++++--------------- 1 file changed, 21 insertions(+), 15 deletions(-)