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@xxxxxxxxxx>
---
arch/x86/kvm/cpuid.c | 26 +++++++++++++++++---------
1 file changed, 17 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 9bf324aa5fae..83b29c5a0498 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -611,6 +611,7 @@ 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_passthrough = 0; \
+ u32 kvm_cpu_cap_emulated = 0; \
\
if (leaf < NCAPINTS) \
kvm_cpu_caps[leaf] &= (mask); \
@@ -619,6 +620,7 @@ do { \
\
kvm_cpu_caps[leaf] |= kvm_cpu_cap_passthrough; \
kvm_cpu_caps[leaf] &= raw_cpuid_get(cpuid); \
+ kvm_cpu_caps[leaf] |= kvm_cpu_cap_emulated; \
} while (0)
/*
@@ -654,6 +656,16 @@ do { \
(IS_ENABLED(CONFIG_X86_64) ? F(name) : 0); \
})
+/*
+ * Emulated Feature - For features that KVM emulates in software irrespective
+ * of host CPU/kernel support.
+ */
+#define EMULATED_F(name) \
+({ \
+ kvm_cpu_cap_emulated |= F(name); \
+ F(name); \
+})
+
/*
* Passthrough Feature - For features that KVM supports based purely on raw
* hardware CPUID, i.e. that KVM virtualizes even if the host kernel doesn't
@@ -715,7 +727,7 @@ void kvm_set_cpu_caps(void)
0 /* Reserved, DCA */ |
F(XMM4_1) |
F(XMM4_2) |
- F(X2APIC) |
+ EMULATED_F(X2APIC) |
F(MOVBE) |
F(POPCNT) |
0 /* Reserved*/ |
@@ -726,8 +738,6 @@ void kvm_set_cpu_caps(void)
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) |
@@ -761,6 +771,7 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_init(CPUID_7_0_EBX,
F(FSGSBASE) |
+ EMULATED_F(TSC_ADJUST) |
F(SGX) |
F(BMI1) |
F(HLE) |
@@ -823,7 +834,7 @@ void kvm_set_cpu_caps(void)
F(AVX512_4FMAPS) |
F(SPEC_CTRL) |
F(SPEC_CTRL_SSBD) |
- F(ARCH_CAPABILITIES) |
+ EMULATED_F(ARCH_CAPABILITIES) |
F(INTEL_STIBP) |
F(MD_CLEAR) |
F(AVX512_VP2INTERSECT) |
@@ -837,10 +848,6 @@ void kvm_set_cpu_caps(void)
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_AMD_IBPB_RET) &&
boot_cpu_has(X86_FEATURE_AMD_IBPB) &&
boot_cpu_has(X86_FEATURE_AMD_IBRS))
@@ -1026,6 +1033,7 @@ void kvm_set_cpu_caps(void)
0 /* SmmPgCfgLock */ |
F(NULL_SEL_CLR_BASE) |
F(AUTOIBRS) |
+ EMULATED_F(NO_SMM_CTL_MSR) |
0 /* PrefetchCtlMsr */ |
F(WRMSR_XX_BASE_NS)
);
@@ -1052,7 +1060,6 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_set(X86_FEATURE_LFENCE_RDTSC);
if (!static_cpu_has_bug(X86_BUG_NULL_SEG))
kvm_cpu_cap_set(X86_FEATURE_NULL_SEL_CLR_BASE);
- kvm_cpu_cap_set(X86_FEATURE_NO_SMM_CTL_MSR);
kvm_cpu_cap_init(CPUID_C000_0001_EDX,
F(XSTORE) |
@@ -1087,6 +1094,7 @@ EXPORT_SYMBOL_GPL(kvm_set_cpu_caps);
#undef F
#undef SF
#undef X86_64_F
+#undef EMULATED_F
#undef PASSTHROUGH_F
#undef ALIASED_1_EDX_F
--
2.47.0.338.g60cca15819-goog
