diff options
| -rw-r--r-- | target-i386/cpu.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/target-i386/cpu.c b/target-i386/cpu.c index 6575834885..390ed4771d 100644 --- a/target-i386/cpu.c +++ b/target-i386/cpu.c @@ -766,10 +766,17 @@ static int cpu_x86_fill_model_id(char *str) return 0; } -static void cpu_x86_fill_host(x86_def_t *x86_cpu_def) +/* Fill a x86_def_t struct with information about the host CPU, and + * the CPU features supported by the host hardware + host kernel + * + * This function may be called only if KVM is enabled. + */ +static void kvm_cpu_fill_host(x86_def_t *x86_cpu_def) { uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0; + assert(kvm_enabled()); + x86_cpu_def->name = "host"; host_cpuid(0x0, 0, &eax, &ebx, &ecx, &edx); x86_cpu_def->level = eax; @@ -784,7 +791,7 @@ static void cpu_x86_fill_host(x86_def_t *x86_cpu_def) x86_cpu_def->ext_features = ecx; x86_cpu_def->features = edx; - if (kvm_enabled() && x86_cpu_def->level >= 7) { + if (x86_cpu_def->level >= 7) { x86_cpu_def->cpuid_7_0_ebx_features = kvm_arch_get_supported_cpuid(kvm_state, 0x7, 0, R_EBX); } else { x86_cpu_def->cpuid_7_0_ebx_features = 0; @@ -839,8 +846,10 @@ static int unavailable_host_feature(struct model_features_t *f, uint32_t mask) /* best effort attempt to inform user requested cpu flags aren't making * their way to the guest. Note: ft[].check_feat ideally should be * specified via a guest_def field to suppress report of extraneous flags. + * + * This function may be called only if KVM is enabled. */ -static int check_features_against_host(x86_def_t *guest_def) +static int kvm_check_features_against_host(x86_def_t *guest_def) { x86_def_t host_def; uint32_t mask; @@ -855,7 +864,9 @@ static int check_features_against_host(x86_def_t *guest_def) {&guest_def->ext3_features, &host_def.ext3_features, ~CPUID_EXT3_SVM, ext3_feature_name, 0x80000001}}; - cpu_x86_fill_host(&host_def); + assert(kvm_enabled()); + + kvm_cpu_fill_host(&host_def); for (rv = 0, i = 0; i < ARRAY_SIZE(ft); ++i) for (mask = 1; mask; mask <<= 1) if (ft[i].check_feat & mask && *ft[i].guest_feat & mask && @@ -1142,7 +1153,7 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model) if (name && !strcmp(name, def->name)) break; if (kvm_enabled() && name && strcmp(name, "host") == 0) { - cpu_x86_fill_host(x86_cpu_def); + kvm_cpu_fill_host(x86_cpu_def); } else if (!def) { goto error; } else { @@ -1280,8 +1291,8 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model) x86_cpu_def->kvm_features &= ~minus_kvm_features; x86_cpu_def->svm_features &= ~minus_svm_features; x86_cpu_def->cpuid_7_0_ebx_features &= ~minus_7_0_ebx_features; - if (check_cpuid) { - if (check_features_against_host(x86_cpu_def) && enforce_cpuid) + if (check_cpuid && kvm_enabled()) { + if (kvm_check_features_against_host(x86_cpu_def) && enforce_cpuid) goto error; } if (x86_cpu_def->cpuid_7_0_ebx_features && x86_cpu_def->level < 7) { |