Index: sys/arm64/include/xen/xen-os.h
===================================================================
--- /dev/null
+++ sys/arm64/include/xen/xen-os.h
@@ -0,0 +1,77 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2014 Julien Grall
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef __MACHINE_ARM64_XEN_XEN_OS_H__
+#define __MACHINE_ARM64_XEN_XEN_OS_H__
+__FBSDID("$FreeBSD$");
+
+#ifndef _XEN_XEN_OS_H_
+#error "do not #include machine/xen/xen-os.h, #include xen/xen-os.h instead"
+#endif
+
+/* Xen/ARM *requires* write-back/cached, so this is the correct setting */
+#define VM_MEMATTR_XEN VM_MEMATTR_WRITE_BACK
+
+#ifndef __ASSEMBLY__
+
+#define XEN_CPUID_TO_VCPUID(cpu) (cpu)
+
+static inline bool
+xen_pv_shutdown_handler(void)
+{
+
+	/* PV shutdown handler are always supported on ARM */
+	return (true);
+}
+
+static inline bool
+xen_has_percpu_evtchn(void)
+{
+
+	/* It's always possible to rebind event channel on ARM */
+	return (true);
+}
+
+static inline bool
+xen_pv_disks_disabled(void)
+{
+
+	/* It's not possible to disable PV disks on ARM */
+	return (false);
+}
+
+static inline bool
+xen_pv_nics_disabled(void)
+{
+
+	/* It's not possible to disable PV nics on ARM */
+	return (false);
+}
+
+#endif
+
+#endif /* __MACHINE_ARM64_XEN_XEN_OS__ */