[RFC PATCH 1/3] configure: disable Xen PCI Passthrough on !x86 archs

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

linking on Linux debian/stretch/arm64 with libxen-4.8:

    hw/xen/xen_pt.o: In function `xen_pt_pci_read_config':
    qemu/hw/xen/xen_pt.c:206: undefined reference to `xen_shutdown_fatal_error'
    hw/xen/xen_pt.o: In function `xen_igd_passthrough_isa_bridge_create':
    qemu/hw/xen/xen_pt.c:698: undefined reference to `igd_passthrough_isa_bridge_create'
    hw/xen/xen_pt.o: In function `xen_pt_pci_write_config':
    qemu/hw/xen/xen_pt.c:355: undefined reference to `xen_shutdown_fatal_error'
    hw/xen/xen_pt_config_init.o: In function `xen_pt_status_reg_init':
    qemu/hw/xen/xen_pt_config_init.c:281: undefined reference to `xen_shutdown_fatal_error'
    qemu/hw/xen/xen_pt_config_init.c:275: undefined reference to `xen_shutdown_fatal_error'
    hw/xen/xen_pt_graphics.o: In function `get_vgabios':
    qemu/hw/xen/xen_pt_graphics.c:135: undefined reference to `pci_assign_dev_load_option_rom'
    collect2: error: ld returned 1 exit status
    Makefile:197: recipe for target 'qemu-system-aarch64' failed
    make[1]: *** [qemu-system-aarch64] Error 1

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 configure | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 806658c98b..e4b173405a 100755
--- a/configure
+++ b/configure
@@ -2344,8 +2344,15 @@ EOF
 fi
 
 if test "$xen_pci_passthrough" != "no"; then
-  if test "$xen" = "yes" && test "$linux" = "yes"; then
-    xen_pci_passthrough=yes
+  if test "$xen" = "yes"; then
+    case "$cpu" in
+    i386|x32|x86_64)
+        if test "$linux" = "yes"; then
+            xen_pci_passthrough=yes
+        fi ;;
+    *)  echo "Disabling Xen PCI Passthrough (not implemented on $cpu)"
+        xen_pci_passthrough=no ;;
+    esac
   else
     if test "$xen_pci_passthrough" = "yes"; then
       error_exit "User requested feature Xen PCI Passthrough" \
-- 
2.13.2


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