diff options
| author |   Sean Christopherson <seanjc@google.com> | 2024-11-27 17:33:57 -0800 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2024-12-18 14:19:53 -0800 |
| commit | 6174004ebd2508556204255757fd77fbc10009f9 (patch) | |
| tree | df46a95bf85c08375580f05d80905d7f6c58284b | |
| parent | KVM: x86: Add a macro to init CPUID features that ignore host kernel support (diff) | |
| download | wireguard-linux-6174004ebd2508556204255757fd77fbc10009f9.tar.xz wireguard-linux-6174004ebd2508556204255757fd77fbc10009f9.zip | |
KVM: x86: Add a macro to init CPUID features that KVM emulates in software
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().
Link: https://lore.kernel.org/r/20241128013424.4096668-31-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 67514cb4e000..40e46098af48 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -632,6 +632,7 @@ 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); \ @@ -640,6 +641,7 @@ 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) /* @@ -676,6 +678,16 @@ do { \ }) /* + * 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 * use the feature. Simply force set the feature in KVM's capabilities, raw @@ -736,7 +748,7 @@ 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*/ | @@ -747,8 +759,6 @@ 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) | @@ -782,6 +792,7 @@ 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) | @@ -844,7 +855,7 @@ 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) | @@ -858,10 +869,6 @@ 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)) @@ -1047,6 +1054,7 @@ 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) ); @@ -1073,7 +1081,6 @@ 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) | @@ -1108,6 +1115,7 @@ 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 |