diff options
| -rw-r--r-- | target/i386/kvm/hyperv-proto.h | 6 | ||||
| -rw-r--r-- | target/i386/kvm/kvm.c | 6 |
2 files changed, 12 insertions, 0 deletions
diff --git a/target/i386/kvm/hyperv-proto.h b/target/i386/kvm/hyperv-proto.h index e30d64b4ad..5fbb385cc1 100644 --- a/target/i386/kvm/hyperv-proto.h +++ b/target/i386/kvm/hyperv-proto.h @@ -39,6 +39,12 @@ #define HV_ACCESS_REENLIGHTENMENTS_CONTROL (1u << 13) /* + * HV_CPUID_FEATURES.EBX bits + */ +#define HV_POST_MESSAGES (1u << 4) +#define HV_SIGNAL_EVENTS (1u << 5) + +/* * HV_CPUID_FEATURES.EDX bits */ #define HV_MWAIT_AVAILABLE (1u << 0) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index eee1a6b46e..59ed8327ac 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -1346,6 +1346,12 @@ static int hyperv_fill_cpuids(CPUState *cs, /* Unconditionally required with any Hyper-V enlightenment */ c->eax |= HV_HYPERCALL_AVAILABLE; + /* SynIC and Vmbus devices require messages/signals hypercalls */ + if (hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNIC) && + !cpu->hyperv_synic_kvm_only) { + c->ebx |= HV_POST_MESSAGES | HV_SIGNAL_EVENTS; + } + /* Not exposed by KVM but needed to make CPU hotplug in Windows work */ c->edx |= HV_CPU_DYNAMIC_PARTITIONING_AVAILABLE; |