+cpu=
+machine=
+
+# Both libguestfs and virt-manager choose cpu=host when we think that
+# KVM is available, and default otherwise. Although testing for KVM
+# is hairy, I found that on aarch64 it can fail unless we choose
+# cpu=host for KVM.
+if test -r /dev/kvm; then
+ cpu=host
+fi