15c3d55faSPekka Enberg #include "kvm/kvm-cpu.h" 25c3d55faSPekka Enberg 3a1fe6bc5SPekka Enberg #include "kvm/kvm.h" 4a1fe6bc5SPekka Enberg #include "kvm/util.h" 5a1fe6bc5SPekka Enberg 6a1fe6bc5SPekka Enberg #include <sys/ioctl.h> 7a1fe6bc5SPekka Enberg #include <stdlib.h> 8a1fe6bc5SPekka Enberg #include <assert.h> 9a1fe6bc5SPekka Enberg 101e1b3818SPekka Enberg #define CPUID_FUNC_PERFMON 0x0A 111e1b3818SPekka Enberg 12a1fe6bc5SPekka Enberg #define MAX_KVM_CPUID_ENTRIES 100 13a1fe6bc5SPekka Enberg 141e1b3818SPekka Enberg static void filter_cpuid(struct kvm_cpuid2 *kvm_cpuid) 151e1b3818SPekka Enberg { 161e1b3818SPekka Enberg unsigned int i; 171e1b3818SPekka Enberg 181e1b3818SPekka Enberg /* 191e1b3818SPekka Enberg * Filter CPUID functions that are not supported by the hypervisor. 201e1b3818SPekka Enberg */ 211e1b3818SPekka Enberg for (i = 0; i < kvm_cpuid->nent; i++) { 221e1b3818SPekka Enberg struct kvm_cpuid_entry2 *entry = &kvm_cpuid->entries[i]; 231e1b3818SPekka Enberg 241e1b3818SPekka Enberg switch (entry->function) { 25*abc73d8dSCyrill Gorcunov case 6: 26*abc73d8dSCyrill Gorcunov /* Clear presence of IA32_ENERGY_PERF_BIAS */ 27*abc73d8dSCyrill Gorcunov entry->ecx = entry->ecx & ~(1 << 3); 28*abc73d8dSCyrill Gorcunov break; 291e1b3818SPekka Enberg case CPUID_FUNC_PERFMON: 301e1b3818SPekka Enberg entry->eax = 0x00; /* disable it */ 311e1b3818SPekka Enberg break; 321e1b3818SPekka Enberg default: 331e1b3818SPekka Enberg /* Keep the CPUID function as -is */ 341e1b3818SPekka Enberg break; 351e1b3818SPekka Enberg }; 361e1b3818SPekka Enberg } 371e1b3818SPekka Enberg } 381e1b3818SPekka Enberg 3943835ac9SSasha Levin void kvm_cpu__setup_cpuid(struct kvm_cpu *vcpu) 40a1fe6bc5SPekka Enberg { 41a1fe6bc5SPekka Enberg struct kvm_cpuid2 *kvm_cpuid; 42a1fe6bc5SPekka Enberg 43bb988cf5SAsias He kvm_cpuid = calloc(1, sizeof(*kvm_cpuid) + MAX_KVM_CPUID_ENTRIES * sizeof(*kvm_cpuid->entries)); 44a1fe6bc5SPekka Enberg 45bb988cf5SAsias He kvm_cpuid->nent = MAX_KVM_CPUID_ENTRIES; 4643835ac9SSasha Levin if (ioctl(vcpu->kvm->sys_fd, KVM_GET_SUPPORTED_CPUID, kvm_cpuid) < 0) 47bb988cf5SAsias He die_perror("KVM_GET_SUPPORTED_CPUID failed"); 48a1fe6bc5SPekka Enberg 491e1b3818SPekka Enberg filter_cpuid(kvm_cpuid); 501e1b3818SPekka Enberg 5143835ac9SSasha Levin if (ioctl(vcpu->vcpu_fd, KVM_SET_CPUID2, kvm_cpuid) < 0) 52a1fe6bc5SPekka Enberg die_perror("KVM_SET_CPUID2 failed"); 53a1fe6bc5SPekka Enberg 54bb988cf5SAsias He free(kvm_cpuid); 55a1fe6bc5SPekka Enberg } 56