D55429.diff
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	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
	@@ -73,6 +73,7 @@
	#include <machine/specialreg.h>
	#include <x86/init.h>
	#include <x86/kvm.h>
	+#include <contrib/xen/arch-x86/cpuid.h>

	#ifdef DDB
	#include <sys/interrupt.h>
	@@ -2100,6 +2101,11 @@

	/* Check if we support extended destination IDs. */
	switch (vm_guest) {
	+ case VM_GUEST_XEN:
	+ cpuid_count(hv_base + 4, 0, regs);
	+ if (regs[0] & XEN_HVM_CPUID_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)