References: boo#981836
Tell libvirt what machine type the user chose for Xen (PV or HVM).
Without a type specified, the default is to return the capabilities of a pv
machine. This will allow the UEFI Customize option to show up when Xen HVM
is selected. Also specify the name of our aavmf firmware for aarch64.
Index: virt-manager-1.3.2/virtinst/domcapabilities.py
===================================================================
--- virt-manager-1.3.2.orig/virtinst/domcapabilities.py
+++ virt-manager-1.3.2/virtinst/domcapabilities.py
@@ -73,13 +73,20 @@ class _Devices(_CapsBlock):
 
 class DomainCapabilities(XMLBuilder):
     @staticmethod
-    def build_from_params(conn, emulator, arch, machine, hvtype):
+    def build_from_params(conn, emulator, arch, machine, hvtype, os_type):
         xml = None
         if conn.check_support(
             conn.SUPPORT_CONN_DOMAIN_CAPABILITIES):
+            machine_type = machine
+            # For Xen capabilities pass either xenpv or xenfv
+            if hvtype == "xen":
+                if os_type == "hvm":
+                    machine_type = "xenfv"
+                else:
+                    machine_type = "xenpv"
             try:
                 xml = conn.getDomainCapabilities(emulator, arch,
-                    machine, hvtype)
+                    machine_type, hvtype)
             except:
                 logging.debug("Error fetching domcapabilities XML",
                     exc_info=True)
@@ -92,7 +99,7 @@ class DomainCapabilities(XMLBuilder):
     @staticmethod
     def build_from_guest(guest):
         return DomainCapabilities.build_from_params(guest.conn,
-            guest.emulator, guest.os.arch, guest.os.machine, guest.type)
+            guest.emulator, guest.os.arch, guest.os.machine, guest.type, guest.os.os_type)
 
     # Mapping of UEFI binary names to their associated architectures. We
     # only use this info to do things automagically for the user, it shouldn't
@@ -106,6 +113,7 @@ class DomainCapabilities(XMLBuilder):
         "aarch64": [
             ".*AAVMF_CODE\.fd",  # RHEL
             ".*aarch64/QEMU_EFI.*",  # gerd's firmware repo
+            ".*aavmf-aarch64-.*"  # SUSE
         ],
     }