From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx> Move the architectural (for lack of a better term) CPUID leaf generation to a separate helper so that the generation code can be reused by TDX, which needs to generate a canonical VM-scoped configuration. Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx> Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx> --- target/i386/kvm/kvm.c | 222 +++++++++++++++++++------------------ target/i386/kvm/kvm_i386.h | 4 + 2 files changed, 119 insertions(+), 107 deletions(-) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 0751e6e102cc..5be151e6499b 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -1686,8 +1686,6 @@ static int hyperv_init_vcpu(X86CPU *cpu) static Error *invtsc_mig_blocker; -#define KVM_MAX_CPUID_ENTRIES 100 - static void kvm_init_xsave(CPUX86State *env) { if (has_xsave2) { @@ -1708,115 +1706,21 @@ static void kvm_init_xsave(CPUX86State *env) env->xsave_buf_len); } -int kvm_arch_init_vcpu(CPUState *cs) +uint32_t kvm_x86_arch_cpuid(CPUX86State *env, struct kvm_cpuid_entry2 *entries, + uint32_t cpuid_i) { - struct { - struct kvm_cpuid2 cpuid; - struct kvm_cpuid_entry2 entries[KVM_MAX_CPUID_ENTRIES]; - } cpuid_data; - /* - * The kernel defines these structs with padding fields so there - * should be no extra padding in our cpuid_data struct. - */ - QEMU_BUILD_BUG_ON(sizeof(cpuid_data) != - sizeof(struct kvm_cpuid2) + - sizeof(struct kvm_cpuid_entry2) * KVM_MAX_CPUID_ENTRIES); - - X86CPU *cpu = X86_CPU(cs); - CPUX86State *env = &cpu->env; - uint32_t limit, i, j, cpuid_i; + uint32_t limit, i, j; uint32_t unused; struct kvm_cpuid_entry2 *c; - uint32_t signature[3]; - int kvm_base = KVM_CPUID_SIGNATURE; - int max_nested_state_len; - int r; - Error *local_err = NULL; - - memset(&cpuid_data, 0, sizeof(cpuid_data)); - - cpuid_i = 0; - - has_xsave2 = kvm_check_extension(cs->kvm_state, KVM_CAP_XSAVE2); - - r = kvm_arch_set_tsc_khz(cs); - if (r < 0) { - return r; - } - - /* vcpu's TSC frequency is either specified by user, or following - * the value used by KVM if the former is not present. In the - * latter case, we query it from KVM and record in env->tsc_khz, - * so that vcpu's TSC frequency can be migrated later via this field. - */ - if (!env->tsc_khz) { - r = kvm_check_extension(cs->kvm_state, KVM_CAP_GET_TSC_KHZ) ? - kvm_vcpu_ioctl(cs, KVM_GET_TSC_KHZ) : - -ENOTSUP; - if (r > 0) { - env->tsc_khz = r; - } - } - - env->apic_bus_freq = KVM_APIC_BUS_FREQUENCY; - - /* - * kvm_hyperv_expand_features() is called here for the second time in case - * KVM_CAP_SYS_HYPERV_CPUID is not supported. While we can't possibly handle - * 'query-cpu-model-expansion' in this case as we don't have a KVM vCPU to - * check which Hyper-V enlightenments are supported and which are not, we - * can still proceed and check/expand Hyper-V enlightenments here so legacy - * behavior is preserved. - */ - if (!kvm_hyperv_expand_features(cpu, &local_err)) { - error_report_err(local_err); - return -ENOSYS; - } - - if (hyperv_enabled(cpu)) { - r = hyperv_init_vcpu(cpu); - if (r) { - return r; - } - - cpuid_i = hyperv_fill_cpuids(cs, cpuid_data.entries); - kvm_base = KVM_CPUID_SIGNATURE_NEXT; - has_msr_hv_hypercall = true; - } - - if (cpu->expose_kvm) { - memcpy(signature, "KVMKVMKVM\0\0\0", 12); - c = &cpuid_data.entries[cpuid_i++]; - c->function = KVM_CPUID_SIGNATURE | kvm_base; - c->eax = KVM_CPUID_FEATURES | kvm_base; - c->ebx = signature[0]; - c->ecx = signature[1]; - c->edx = signature[2]; - - c = &cpuid_data.entries[cpuid_i++]; - c->function = KVM_CPUID_FEATURES | kvm_base; - c->eax = env->features[FEAT_KVM]; - c->edx = env->features[FEAT_KVM_HINTS]; - } cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused); - if (cpu->kvm_pv_enforce_cpuid) { - r = kvm_vcpu_enable_cap(cs, KVM_CAP_ENFORCE_PV_FEATURE_CPUID, 0, 1); - if (r < 0) { - fprintf(stderr, - "failed to enable KVM_CAP_ENFORCE_PV_FEATURE_CPUID: %s", - strerror(-r)); - abort(); - } - } - for (i = 0; i <= limit; i++) { if (cpuid_i == KVM_MAX_CPUID_ENTRIES) { fprintf(stderr, "unsupported level value: 0x%x\n", limit); abort(); } - c = &cpuid_data.entries[cpuid_i++]; + c = &entries[cpuid_i++]; switch (i) { case 2: { @@ -1835,7 +1739,7 @@ int kvm_arch_init_vcpu(CPUState *cs) "cpuid(eax:2):eax & 0xf = 0x%x\n", times); abort(); } - c = &cpuid_data.entries[cpuid_i++]; + c = &entries[cpuid_i++]; c->function = i; c->flags = KVM_CPUID_FLAG_STATEFUL_FUNC; cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx); @@ -1881,7 +1785,7 @@ int kvm_arch_init_vcpu(CPUState *cs) "cpuid(eax:0x%x,ecx:0x%x)\n", i, j); abort(); } - c = &cpuid_data.entries[cpuid_i++]; + c = &entries[cpuid_i++]; } break; case 0x7: @@ -1901,7 +1805,7 @@ int kvm_arch_init_vcpu(CPUState *cs) "cpuid(eax:0x12,ecx:0x%x)\n", j); abort(); } - c = &cpuid_data.entries[cpuid_i++]; + c = &entries[cpuid_i++]; } break; case 0x14: @@ -1921,7 +1825,7 @@ int kvm_arch_init_vcpu(CPUState *cs) "cpuid(eax:0x%x,ecx:0x%x)\n", i, j); abort(); } - c = &cpuid_data.entries[cpuid_i++]; + c = &entries[cpuid_i++]; c->function = i; c->index = j; c->flags = KVM_CPUID_FLAG_SIGNIFCANT_INDEX; @@ -1978,7 +1882,7 @@ int kvm_arch_init_vcpu(CPUState *cs) fprintf(stderr, "unsupported xlevel value: 0x%x\n", limit); abort(); } - c = &cpuid_data.entries[cpuid_i++]; + c = &entries[cpuid_i++]; switch (i) { case 0x8000001d: @@ -1997,7 +1901,7 @@ int kvm_arch_init_vcpu(CPUState *cs) "cpuid(eax:0x%x,ecx:0x%x)\n", i, j); abort(); } - c = &cpuid_data.entries[cpuid_i++]; + c = &entries[cpuid_i++]; } break; default: @@ -2024,7 +1928,7 @@ int kvm_arch_init_vcpu(CPUState *cs) fprintf(stderr, "unsupported xlevel2 value: 0x%x\n", limit); abort(); } - c = &cpuid_data.entries[cpuid_i++]; + c = &entries[cpuid_i++]; c->function = i; c->flags = 0; @@ -2032,6 +1936,110 @@ int kvm_arch_init_vcpu(CPUState *cs) } } + return cpuid_i; +} + +int kvm_arch_init_vcpu(CPUState *cs) +{ + struct { + struct kvm_cpuid2 cpuid; + struct kvm_cpuid_entry2 entries[KVM_MAX_CPUID_ENTRIES]; + } cpuid_data; + /* + * The kernel defines these structs with padding fields so there + * should be no extra padding in our cpuid_data struct. + */ + QEMU_BUILD_BUG_ON(sizeof(cpuid_data) != + sizeof(struct kvm_cpuid2) + + sizeof(struct kvm_cpuid_entry2) * KVM_MAX_CPUID_ENTRIES); + + X86CPU *cpu = X86_CPU(cs); + CPUX86State *env = &cpu->env; + uint32_t cpuid_i; + struct kvm_cpuid_entry2 *c; + uint32_t signature[3]; + int kvm_base = KVM_CPUID_SIGNATURE; + int max_nested_state_len; + int r; + Error *local_err = NULL; + + memset(&cpuid_data, 0, sizeof(cpuid_data)); + + cpuid_i = 0; + + has_xsave2 = kvm_check_extension(cs->kvm_state, KVM_CAP_XSAVE2); + + r = kvm_arch_set_tsc_khz(cs); + if (r < 0) { + return r; + } + + /* vcpu's TSC frequency is either specified by user, or following + * the value used by KVM if the former is not present. In the + * latter case, we query it from KVM and record in env->tsc_khz, + * so that vcpu's TSC frequency can be migrated later via this field. + */ + if (!env->tsc_khz) { + r = kvm_check_extension(cs->kvm_state, KVM_CAP_GET_TSC_KHZ) ? + kvm_vcpu_ioctl(cs, KVM_GET_TSC_KHZ) : + -ENOTSUP; + if (r > 0) { + env->tsc_khz = r; + } + } + + env->apic_bus_freq = KVM_APIC_BUS_FREQUENCY; + + /* + * kvm_hyperv_expand_features() is called here for the second time in case + * KVM_CAP_SYS_HYPERV_CPUID is not supported. While we can't possibly handle + * 'query-cpu-model-expansion' in this case as we don't have a KVM vCPU to + * check which Hyper-V enlightenments are supported and which are not, we + * can still proceed and check/expand Hyper-V enlightenments here so legacy + * behavior is preserved. + */ + if (!kvm_hyperv_expand_features(cpu, &local_err)) { + error_report_err(local_err); + return -ENOSYS; + } + + if (hyperv_enabled(cpu)) { + r = hyperv_init_vcpu(cpu); + if (r) { + return r; + } + + cpuid_i = hyperv_fill_cpuids(cs, cpuid_data.entries); + kvm_base = KVM_CPUID_SIGNATURE_NEXT; + has_msr_hv_hypercall = true; + } + + if (cpu->expose_kvm) { + memcpy(signature, "KVMKVMKVM\0\0\0", 12); + c = &cpuid_data.entries[cpuid_i++]; + c->function = KVM_CPUID_SIGNATURE | kvm_base; + c->eax = KVM_CPUID_FEATURES | kvm_base; + c->ebx = signature[0]; + c->ecx = signature[1]; + c->edx = signature[2]; + + c = &cpuid_data.entries[cpuid_i++]; + c->function = KVM_CPUID_FEATURES | kvm_base; + c->eax = env->features[FEAT_KVM]; + c->edx = env->features[FEAT_KVM_HINTS]; + } + + if (cpu->kvm_pv_enforce_cpuid) { + r = kvm_vcpu_enable_cap(cs, KVM_CAP_ENFORCE_PV_FEATURE_CPUID, 0, 1); + if (r < 0) { + fprintf(stderr, + "failed to enable KVM_CAP_ENFORCE_PV_FEATURE_CPUID: %s", + strerror(-r)); + abort(); + } + } + + cpuid_i = kvm_x86_arch_cpuid(env, cpuid_data.entries, cpuid_i); cpuid_data.cpuid.nent = cpuid_i; if (((env->cpuid_version >> 8)&0xF) >= 6 diff --git a/target/i386/kvm/kvm_i386.h b/target/i386/kvm/kvm_i386.h index b434feaa6b1d..5c7972f617e8 100644 --- a/target/i386/kvm/kvm_i386.h +++ b/target/i386/kvm/kvm_i386.h @@ -24,6 +24,10 @@ #define kvm_ioapic_in_kernel() \ (kvm_irqchip_in_kernel() && !kvm_irqchip_is_split()) +#define KVM_MAX_CPUID_ENTRIES 100 +uint32_t kvm_x86_arch_cpuid(CPUX86State *env, struct kvm_cpuid_entry2 *entries, + uint32_t cpuid_i); + #else #define kvm_pit_in_kernel() 0 -- 2.27.0