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-rw-r--r--target-i386/kvm.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 57389114f6..e6831b27fe 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -72,6 +72,8 @@ static bool has_msr_misc_enable;
static bool has_msr_bndcfgs;
static bool has_msr_kvm_steal_time;
static int lm_capable_kernel;
+static bool has_msr_hv_hypercall;
+static bool has_msr_hv_vapic;
static bool has_msr_architectural_pmu;
static uint32_t num_architectural_pmu_counters;
@@ -437,8 +439,10 @@ static bool hyperv_hypercall_available(X86CPU *cpu)
static bool hyperv_enabled(X86CPU *cpu)
{
- return hyperv_hypercall_available(cpu) ||
- cpu->hyperv_relaxed_timing;
+ CPUState *cs = CPU(cpu);
+ return kvm_check_extension(cs->kvm_state, KVM_CAP_HYPERV) > 0 &&
+ (hyperv_hypercall_available(cpu) ||
+ cpu->hyperv_relaxed_timing);
}
#define KVM_MAX_CPUID_ENTRIES 100
@@ -493,6 +497,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
if (cpu->hyperv_vapic) {
c->eax |= HV_X64_MSR_HYPERCALL_AVAILABLE;
c->eax |= HV_X64_MSR_APIC_ACCESS_AVAILABLE;
+ has_msr_hv_vapic = true;
}
c = &cpuid_data.entries[cpuid_i++];
@@ -500,7 +505,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
if (cpu->hyperv_relaxed_timing) {
c->eax |= HV_X64_RELAXED_TIMING_RECOMMENDED;
}
- if (cpu->hyperv_vapic) {
+ if (has_msr_hv_vapic) {
c->eax |= HV_X64_APIC_ACCESS_RECOMMENDED;
}
c->ebx = cpu->hyperv_spinlock_attempts;
@@ -511,6 +516,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
c->ebx = 0x40;
kvm_base = KVM_CPUID_SIGNATURE_NEXT;
+ has_msr_hv_hypercall = true;
}
memcpy(signature, "KVMKVMKVM\0\0\0", 12);
@@ -1223,11 +1229,11 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
kvm_msr_entry_set(&msrs[n++], MSR_CORE_PERF_GLOBAL_CTRL,
env->msr_global_ctrl);
}
- if (hyperv_hypercall_available(cpu)) {
+ if (has_msr_hv_hypercall) {
kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_GUEST_OS_ID, 0);
kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_HYPERCALL, 0);
}
- if (cpu->hyperv_vapic) {
+ if (has_msr_hv_vapic) {
kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_APIC_ASSIST_PAGE, 0);
}