diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index b34eb81..cd492d4 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -683,156 +683,394 @@ static bool tsc_is_stable_and_known(CPUX86State *env)
         || env->user_tsc_khz;
 }
 
-static int hyperv_handle_properties(CPUState *cs)
+static struct {
+    const char *desc;
+    struct {
+        uint32_t fw;
+        uint32_t bits;
+    } flags[2];
+} kvm_hyperv_properties[] = {
+    [HYPERV_FEAT_RELAXED] = {
+        .desc = "relaxed timing (hv-relaxed)",
+        .flags = {
+            {.fw = FEAT_HYPERV_EAX,
+             .bits = HV_HYPERCALL_AVAILABLE},
+            {.fw = FEAT_HV_RECOMM_EAX,
+             .bits = HV_RELAXED_TIMING_RECOMMENDED}
+        }
+    },
+    [HYPERV_FEAT_VAPIC] = {
+        .desc = "virtual APIC (hv-vapic)",
+        .flags = {
+            {.fw = FEAT_HYPERV_EAX,
+             .bits = HV_HYPERCALL_AVAILABLE | HV_APIC_ACCESS_AVAILABLE},
+            {.fw = FEAT_HV_RECOMM_EAX,
+             .bits = HV_APIC_ACCESS_RECOMMENDED}
+        }
+    },
+    [HYPERV_FEAT_TIME] = {
+        .desc = "clocksources (hv-time)",
+        .flags = {
+            {.fw = FEAT_HYPERV_EAX,
+             .bits = HV_HYPERCALL_AVAILABLE | HV_TIME_REF_COUNT_AVAILABLE |
+             HV_REFERENCE_TSC_AVAILABLE}
+        }
+    },
+    [HYPERV_FEAT_CRASH] = {
+        .desc = "crash MSRs (hv-crash)",
+        .flags = {
+            {.fw = FEAT_HYPERV_EDX,
+             .bits = HV_GUEST_CRASH_MSR_AVAILABLE}
+        }
+    },
+    [HYPERV_FEAT_RESET] = {
+        .desc = "reset MSR (hv-reset)",
+        .flags = {
+            {.fw = FEAT_HYPERV_EAX,
+             .bits = HV_RESET_AVAILABLE}
+        }
+    },
+    [HYPERV_FEAT_VPINDEX] = {
+        .desc = "VP_INDEX MSR (hv-vpindex)",
+        .flags = {
+            {.fw = FEAT_HYPERV_EAX,
+             .bits = HV_VP_INDEX_AVAILABLE}
+        }
+    },
+    [HYPERV_FEAT_RUNTIME] = {
+        .desc = "VP_RUNTIME MSR (hv-runtime)",
+        .flags = {
+            {.fw = FEAT_HYPERV_EAX,
+             .bits = HV_VP_RUNTIME_AVAILABLE}
+        }
+    },
+    [HYPERV_FEAT_SYNIC] = {
+        .desc = "synthetic interrupt controller (hv-synic)",
+        .flags = {
+            {.fw = FEAT_HYPERV_EAX,
+             .bits = HV_SYNIC_AVAILABLE}
+        }
+    },
+    [HYPERV_FEAT_STIMER] = {
+        .desc = "synthetic timers (hv-stimer)",
+        .flags = {
+            {.fw = FEAT_HYPERV_EAX,
+             .bits = HV_SYNTIMERS_AVAILABLE}
+        }
+    },
+    [HYPERV_FEAT_FREQUENCIES] = {
+        .desc = "frequency MSRs (hv-frequencies)",
+        .flags = {
+            {.fw = FEAT_HYPERV_EAX,
+             .bits = HV_ACCESS_FREQUENCY_MSRS},
+            {.fw = FEAT_HYPERV_EDX,
+             .bits = HV_FREQUENCY_MSRS_AVAILABLE}
+        }
+    },
+    [HYPERV_FEAT_REENLIGHTENMENT] = {
+        .desc = "reenlightenment MSRs (hv-reenlightenment)",
+        .flags = {
+            {.fw = FEAT_HYPERV_EAX,
+             .bits = HV_ACCESS_REENLIGHTENMENTS_CONTROL}
+        }
+    },
+    [HYPERV_FEAT_TLBFLUSH] = {
+        .desc = "paravirtualized TLB flush (hv-tlbflush)",
+        .flags = {
+            {.fw = FEAT_HV_RECOMM_EAX,
+             .bits = HV_REMOTE_TLB_FLUSH_RECOMMENDED |
+             HV_EX_PROCESSOR_MASKS_RECOMMENDED}
+        }
+    },
+    [HYPERV_FEAT_EVMCS] = {
+        .desc = "enlightened VMCS (hv-evmcs)",
+        .flags = {
+            {.fw = FEAT_HV_RECOMM_EAX,
+             .bits = HV_ENLIGHTENED_VMCS_RECOMMENDED}
+        }
+    },
+    [HYPERV_FEAT_IPI] = {
+        .desc = "paravirtualized IPI (hv-ipi)",
+        .flags = {
+            {.fw = FEAT_HV_RECOMM_EAX,
+             .bits = HV_CLUSTER_IPI_RECOMMENDED |
+             HV_EX_PROCESSOR_MASKS_RECOMMENDED}
+        }
+    },
+};
+
+static struct kvm_cpuid2 *try_get_hv_cpuid(CPUState *cs, int max)
+{
+    struct kvm_cpuid2 *cpuid;
+    int r, size;
+
+    size = sizeof(*cpuid) + max * sizeof(*cpuid->entries);
+    cpuid = g_malloc0(size);
+    cpuid->nent = max;
+
+    r = kvm_vcpu_ioctl(cs, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
+    if (r == 0 && cpuid->nent >= max) {
+        r = -E2BIG;
+    }
+    if (r < 0) {
+        if (r == -E2BIG) {
+            g_free(cpuid);
+            return NULL;
+        } else {
+            fprintf(stderr, "KVM_GET_SUPPORTED_HV_CPUID failed: %s\n",
+                    strerror(-r));
+            exit(1);
+        }
+    }
+    return cpuid;
+}
+
+/*
+ * Run KVM_GET_SUPPORTED_HV_CPUID ioctl(), allocating a buffer large enough
+ * for all entries.
+ */
+static struct kvm_cpuid2 *get_supported_hv_cpuid(CPUState *cs)
+{
+    struct kvm_cpuid2 *cpuid;
+    int max = 7; /* 0x40000000..0x40000005, 0x4000000A */
+
+    /*
+     * When the buffer is too small, KVM_GET_SUPPORTED_HV_CPUID fails with
+     * -E2BIG, however, it doesn't report back the right size. Keep increasing
+     * it and re-trying until we succeed.
+     */
+    while ((cpuid = try_get_hv_cpuid(cs, max)) == NULL) {
+        max++;
+    }
+    return cpuid;
+}
+
+/*
+ * When KVM_GET_SUPPORTED_HV_CPUID is not supported we fill CPUID feature
+ * leaves from KVM_CAP_HYPERV* and present MSRs data.
+ */
+static struct kvm_cpuid2 *get_supported_hv_cpuid_legacy(CPUState *cs)
 {
     X86CPU *cpu = X86_CPU(cs);
-    CPUX86State *env = &cpu->env;
+    struct kvm_cpuid2 *cpuid;
+    struct kvm_cpuid_entry2 *entry_feat, *entry_recomm;
+
+    /* HV_CPUID_FEATURES, HV_CPUID_ENLIGHTMENT_INFO */
+    cpuid = g_malloc0(sizeof(*cpuid) + 2 * sizeof(*cpuid->entries));
+    cpuid->nent = 2;
+
+    /* HV_CPUID_VENDOR_AND_MAX_FUNCTIONS */
+    entry_feat = &cpuid->entries[0];
+    entry_feat->function = HV_CPUID_FEATURES;
 
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_RELAXED)) {
-        env->features[FEAT_HYPERV_EAX] |= HV_HYPERCALL_AVAILABLE;
+    entry_recomm = &cpuid->entries[1];
+    entry_recomm->function = HV_CPUID_ENLIGHTMENT_INFO;
+    entry_recomm->ebx = cpu->hyperv_spinlock_attempts;
+
+    if (kvm_check_extension(cs->kvm_state, KVM_CAP_HYPERV) > 0) {
+        entry_feat->eax |= HV_HYPERCALL_AVAILABLE;
+        entry_feat->eax |= HV_APIC_ACCESS_AVAILABLE;
+        entry_feat->edx |= HV_CPU_DYNAMIC_PARTITIONING_AVAILABLE;
+        entry_recomm->eax |= HV_RELAXED_TIMING_RECOMMENDED;
+        entry_recomm->eax |= HV_APIC_ACCESS_RECOMMENDED;
     }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_VAPIC)) {
-        env->features[FEAT_HYPERV_EAX] |= HV_HYPERCALL_AVAILABLE;
-        env->features[FEAT_HYPERV_EAX] |= HV_APIC_ACCESS_AVAILABLE;
+
+    if (kvm_check_extension(cs->kvm_state, KVM_CAP_HYPERV_TIME) > 0) {
+        entry_feat->eax |= HV_TIME_REF_COUNT_AVAILABLE;
+        entry_feat->eax |= HV_REFERENCE_TSC_AVAILABLE;
     }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_TIME)) {
-        if (kvm_check_extension(cs->kvm_state, KVM_CAP_HYPERV_TIME) <= 0) {
-            fprintf(stderr, "Hyper-V clocksources "
-                    "(requested by 'hv-time' cpu flag) "
-                    "are not supported by kernel\n");
-            return -ENOSYS;
-        }
-        env->features[FEAT_HYPERV_EAX] |= HV_HYPERCALL_AVAILABLE;
-        env->features[FEAT_HYPERV_EAX] |= HV_TIME_REF_COUNT_AVAILABLE;
-        env->features[FEAT_HYPERV_EAX] |= HV_REFERENCE_TSC_AVAILABLE;
+
+    if (has_msr_hv_frequencies) {
+        entry_feat->eax |= HV_ACCESS_FREQUENCY_MSRS;
+        entry_feat->edx |= HV_FREQUENCY_MSRS_AVAILABLE;
     }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_FREQUENCIES)) {
-        if (!has_msr_hv_frequencies) {
-            fprintf(stderr, "Hyper-V frequency MSRs "
-                    "(requested by 'hv-frequencies' cpu flag) "
-                    "are not supported by kernel\n");
-            return -ENOSYS;
-        }
-        env->features[FEAT_HYPERV_EAX] |= HV_ACCESS_FREQUENCY_MSRS;
-        env->features[FEAT_HYPERV_EDX] |= HV_FREQUENCY_MSRS_AVAILABLE;
+
+    if (has_msr_hv_crash) {
+        entry_feat->edx |= HV_GUEST_CRASH_MSR_AVAILABLE;
     }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_CRASH)) {
-        if (!has_msr_hv_crash) {
-            fprintf(stderr, "Hyper-V crash MSRs "
-                    "(requested by 'hv-crash' cpu flag) "
-                    "are not supported by kernel\n");
-            return -ENOSYS;
-        }
-        env->features[FEAT_HYPERV_EDX] |= HV_GUEST_CRASH_MSR_AVAILABLE;
+
+    if (has_msr_hv_reenlightenment) {
+        entry_feat->eax |= HV_ACCESS_REENLIGHTENMENTS_CONTROL;
     }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_REENLIGHTENMENT)) {
-        if (!has_msr_hv_reenlightenment) {
-            fprintf(stderr,
-                    "Hyper-V Reenlightenment MSRs "
-                    "(requested by 'hv-reenlightenment' cpu flag) "
-                    "are not supported by kernel\n");
-            return -ENOSYS;
-        }
-        env->features[FEAT_HYPERV_EAX] |= HV_ACCESS_REENLIGHTENMENTS_CONTROL;
+
+    if (has_msr_hv_reset) {
+        entry_feat->eax |= HV_RESET_AVAILABLE;
     }
-    env->features[FEAT_HYPERV_EDX] |= HV_CPU_DYNAMIC_PARTITIONING_AVAILABLE;
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_RESET)) {
-        if (!has_msr_hv_reset) {
-            fprintf(stderr, "Hyper-V reset MSR "
-                    "(requested by 'hv-reset' cpu flag) "
-                    "is not supported by kernel\n");
-            return -ENOSYS;
-        }
-        env->features[FEAT_HYPERV_EAX] |= HV_RESET_AVAILABLE;
+
+    if (has_msr_hv_vpindex) {
+        entry_feat->eax |= HV_VP_INDEX_AVAILABLE;
     }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_VPINDEX)) {
-        if (!has_msr_hv_vpindex) {
-            fprintf(stderr, "Hyper-V VP_INDEX MSR "
-                    "(requested by 'hv-vpindex' cpu flag) "
-                    "is not supported by kernel\n");
-            return -ENOSYS;
-        }
-        env->features[FEAT_HYPERV_EAX] |= HV_VP_INDEX_AVAILABLE;
+
+    if (has_msr_hv_runtime) {
+        entry_feat->eax |= HV_VP_RUNTIME_AVAILABLE;
     }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_RUNTIME)) {
-        if (!has_msr_hv_runtime) {
-            fprintf(stderr, "Hyper-V VP_RUNTIME MSR "
-                    "(requested by 'hv-runtime' cpu flag) "
-                    "is not supported by kernel\n");
-            return -ENOSYS;
+
+    if (has_msr_hv_synic) {
+        unsigned int cap = cpu->hyperv_synic_kvm_only ?
+            KVM_CAP_HYPERV_SYNIC : KVM_CAP_HYPERV_SYNIC2;
+
+        if (kvm_check_extension(cs->kvm_state, cap) > 0) {
+            entry_feat->eax |= HV_SYNIC_AVAILABLE;
         }
-        env->features[FEAT_HYPERV_EAX] |= HV_VP_RUNTIME_AVAILABLE;
     }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNIC)) {
-        unsigned int cap = KVM_CAP_HYPERV_SYNIC;
-        if (!cpu->hyperv_synic_kvm_only) {
-            if (!hyperv_feat_enabled(cpu, HYPERV_FEAT_VPINDEX)) {
-                fprintf(stderr, "Hyper-V SynIC "
-                        "(requested by 'hv-synic' cpu flag) "
-                        "requires Hyper-V VP_INDEX ('hv-vpindex')\n");
-            return -ENOSYS;
-            }
-            cap = KVM_CAP_HYPERV_SYNIC2;
-        }
 
-        if (!has_msr_hv_synic || !kvm_check_extension(cs->kvm_state, cap)) {
-            fprintf(stderr, "Hyper-V SynIC (requested by 'hv-synic' cpu flag) "
-                    "is not supported by kernel\n");
-            return -ENOSYS;
-        }
+    if (has_msr_hv_stimer) {
+        entry_feat->eax |= HV_SYNTIMERS_AVAILABLE;
+    }
 
-        env->features[FEAT_HYPERV_EAX] |= HV_SYNIC_AVAILABLE;
+    if (kvm_check_extension(cs->kvm_state,
+                            KVM_CAP_HYPERV_TLBFLUSH) > 0) {
+        entry_recomm->eax |= HV_REMOTE_TLB_FLUSH_RECOMMENDED;
+        entry_recomm->eax |= HV_EX_PROCESSOR_MASKS_RECOMMENDED;
     }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_STIMER)) {
-        if (!has_msr_hv_stimer) {
-            fprintf(stderr, "Hyper-V timers aren't supported by kernel\n");
-            return -ENOSYS;
-        }
-        env->features[FEAT_HYPERV_EAX] |= HV_SYNTIMERS_AVAILABLE;
+
+    if (kvm_check_extension(cs->kvm_state,
+                            KVM_CAP_HYPERV_ENLIGHTENED_VMCS) > 0) {
+        entry_recomm->eax |= HV_ENLIGHTENED_VMCS_RECOMMENDED;
     }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_RELAXED)) {
-        env->features[FEAT_HV_RECOMM_EAX] |= HV_RELAXED_TIMING_RECOMMENDED;
+
+    if (kvm_check_extension(cs->kvm_state,
+                            KVM_CAP_HYPERV_SEND_IPI) > 0) {
+        entry_recomm->eax |= HV_CLUSTER_IPI_RECOMMENDED;
+        entry_recomm->eax |= HV_EX_PROCESSOR_MASKS_RECOMMENDED;
     }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_VAPIC)) {
-        env->features[FEAT_HV_RECOMM_EAX] |= HV_APIC_ACCESS_RECOMMENDED;
-    }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_TLBFLUSH)) {
-        if (kvm_check_extension(cs->kvm_state,
-                                KVM_CAP_HYPERV_TLBFLUSH) <= 0) {
-            fprintf(stderr, "Hyper-V TLB flush support "
-                    "(requested by 'hv-tlbflush' cpu flag) "
-                    " is not supported by kernel\n");
-            return -ENOSYS;
-        }
-        env->features[FEAT_HV_RECOMM_EAX] |= HV_REMOTE_TLB_FLUSH_RECOMMENDED;
-        env->features[FEAT_HV_RECOMM_EAX] |= HV_EX_PROCESSOR_MASKS_RECOMMENDED;
+
+    return cpuid;
+}
+
+static int hv_cpuid_get_fw(struct kvm_cpuid2 *cpuid, int fw, uint32_t *r)
+{
+    struct kvm_cpuid_entry2 *entry;
+    uint32_t func;
+    int reg;
+
+    switch (fw) {
+    case FEAT_HYPERV_EAX:
+        reg = R_EAX;
+        func = HV_CPUID_FEATURES;
+        break;
+    case FEAT_HYPERV_EDX:
+        reg = R_EDX;
+        func = HV_CPUID_FEATURES;
+        break;
+    case FEAT_HV_RECOMM_EAX:
+        reg = R_EAX;
+        func = HV_CPUID_ENLIGHTMENT_INFO;
+        break;
+    default:
+        return -EINVAL;
     }
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_IPI)) {
-        if (kvm_check_extension(cs->kvm_state,
-                                KVM_CAP_HYPERV_SEND_IPI) <= 0) {
-            fprintf(stderr, "Hyper-V IPI send support "
-                    "(requested by 'hv-ipi' cpu flag) "
-                    " is not supported by kernel\n");
-            return -ENOSYS;
+
+    entry = cpuid_find_entry(cpuid, func, 0);
+    if (!entry) {
+        return -ENOENT;
+    }
+
+    switch (reg) {
+    case R_EAX:
+        *r = entry->eax;
+        break;
+    case R_EDX:
+        *r = entry->edx;
+        break;
+    default:
+        return -EINVAL;
+    }
+
+    return 0;
+}
+
+static int hv_cpuid_check_and_set(CPUState *cs, struct kvm_cpuid2 *cpuid,
+                                  int feature)
+{
+    X86CPU *cpu = X86_CPU(cs);
+    CPUX86State *env = &cpu->env;
+    uint32_t r, fw, bits;;
+    int i;
+
+    if (!hyperv_feat_enabled(cpu, feature)) {
+        return 0;
+    }
+
+    for (i = 0; i < ARRAY_SIZE(kvm_hyperv_properties[feature].flags); i++) {
+        fw = kvm_hyperv_properties[feature].flags[i].fw;
+        bits = kvm_hyperv_properties[feature].flags[i].bits;
+
+        if (!fw) {
+            continue;
         }
-        env->features[FEAT_HV_RECOMM_EAX] |= HV_CLUSTER_IPI_RECOMMENDED;
-        env->features[FEAT_HV_RECOMM_EAX] |= HV_EX_PROCESSOR_MASKS_RECOMMENDED;
+
+        if (hv_cpuid_get_fw(cpuid, fw, &r) || (r & bits) != bits) {
+            fprintf(stderr,
+                    "Hyper-V %s is not supported by kernel\n",
+                    kvm_hyperv_properties[feature].desc);
+            return 1;
+        }
+
+        env->features[fw] |= bits;
     }
+
+    return 0;
+}
+
+static int hyperv_handle_properties(CPUState *cs)
+{
+    X86CPU *cpu = X86_CPU(cs);
+    CPUX86State *env = &cpu->env;
+    struct kvm_cpuid2 *cpuid;
+    int r = 0;
+
     if (hyperv_feat_enabled(cpu, HYPERV_FEAT_EVMCS)) {
         uint16_t evmcs_version;
 
         if (kvm_vcpu_enable_cap(cs, KVM_CAP_HYPERV_ENLIGHTENED_VMCS, 0,
                                 (uintptr_t)&evmcs_version)) {
-            fprintf(stderr, "Hyper-V Enlightened VMCS "
-                    "(requested by 'hv-evmcs' cpu flag) "
-                    "is not supported by kernel\n");
+            fprintf(stderr, "Hyper-V %s is not supported by kernel\n",
+                    kvm_hyperv_properties[HYPERV_FEAT_EVMCS].desc);
             return -ENOSYS;
         }
         env->features[FEAT_HV_RECOMM_EAX] |= HV_ENLIGHTENED_VMCS_RECOMMENDED;
         env->features[FEAT_HV_NESTED_EAX] = evmcs_version;
     }
 
-    return 0;
+    if (kvm_check_extension(cs->kvm_state, KVM_CAP_HYPERV_CPUID) > 0) {
+        cpuid = get_supported_hv_cpuid(cs);
+    } else {
+        cpuid = get_supported_hv_cpuid_legacy(cs);
+    }
+
+    /* Features */
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_RELAXED);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_VAPIC);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_TIME);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_CRASH);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_RESET);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_VPINDEX);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_RUNTIME);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_SYNIC);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_STIMER);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_FREQUENCIES);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_REENLIGHTENMENT);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_TLBFLUSH);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_EVMCS);
+    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_IPI);
+
+    /* Dependencies */
+    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNIC) &&
+        !cpu->hyperv_synic_kvm_only &&
+        !hyperv_feat_enabled(cpu, HYPERV_FEAT_VPINDEX)) {
+        fprintf(stderr, "Hyper-V %s requires %s\n",
+                kvm_hyperv_properties[HYPERV_FEAT_SYNIC].desc,
+                kvm_hyperv_properties[HYPERV_FEAT_VPINDEX].desc);
+        r |= 1;
+    }
+
+    /* Not exposed by KVM but needed to make CPU hotplug in Windows work */
+    env->features[FEAT_HYPERV_EDX] |= HV_CPU_DYNAMIC_PARTITIONING_AVAILABLE;
+
+    g_free(cpuid);
+
+    return r ? -ENOSYS : 0;
 }
 
 static int hyperv_init_vcpu(X86CPU *cpu)
