D55432.diff
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	diff --git a/sys/dev/hyperv/vmbus/x86/hyperv_reg.h b/sys/dev/hyperv/vmbus/x86/hyperv_reg.h
	--- a/sys/dev/hyperv/vmbus/x86/hyperv_reg.h
	+++ b/sys/dev/hyperv/vmbus/x86/hyperv_reg.h
	@@ -45,4 +45,10 @@
	#define CPUID_LEAF_HV_IDENTITY 0x40000002
	#define CPUID_LEAF_HV_FEATURES 0x40000003
	#define CPUID_LEAF_HV_RECOMMENDS 0x40000004
	+
	+#define CPUID_LEAF_HV_STACK_INTERFACE 0x40000081
	+#define HYPERV_STACK_INTERFACE_EAX_SIG 0x31235356 /* "VS#1" */
	+#define CPUID_LEAF_HV_STACK_PROPERTIES 0x40000082
	+#define HYPERV_PROPERTIES_EXT_DEST_ID 0x00000004
	+
	#endif /* !_HYPERV_REG_H_ */
	diff --git a/sys/x86/x86/local_apic.c b/sys/x86/x86/local_apic.c
	--- a/sys/x86/x86/local_apic.c
	+++ b/sys/x86/x86/local_apic.c
	@@ -75,6 +75,7 @@
	#include <x86/kvm.h>
	#include <contrib/xen/arch-x86/cpuid.h>
	#include <x86/bhyve.h>
	+#include <dev/hyperv/vmbus/x86/hyperv_reg.h>

	#ifdef DDB
	#include <sys/interrupt.h>
	@@ -2107,6 +2108,14 @@
	if (regs[0] & XEN_HVM_CPUID_EXT_DEST_ID)
	apic_ext_dest_id = 1;
	break;
	+ case VM_GUEST_HV:
	+ cpuid_count(CPUID_LEAF_HV_STACK_INTERFACE, 0, regs);
	+ if (regs[0] != HYPERV_STACK_INTERFACE_EAX_SIG)
	+ break;
	+ cpuid_count(CPUID_LEAF_HV_STACK_PROPERTIES, 0, regs);
	+ if (regs[0] & HYPERV_PROPERTIES_EXT_DEST_ID)
	+ apic_ext_dest_id = 1;
	+ break;
	case VM_GUEST_KVM:
	kvm_cpuid_get_features(regs);
	if (regs[0] & KVM_FEATURE_MSI_EXT_DEST_ID)