xen: Clean up build system

Introduce CONFIG_XEN_BACKEND so that this new config solely controls the
target-independent backend build and CONFIG_XEN can focus on per-target
building.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

Makefile.objs

@@ -155,8 +155,8 @@ slirp-obj-y += tcp_subr.o tcp_timer.o udp.o bootp.o tftp.o
 common-obj-$(CONFIG_SLIRP) += $(addprefix slirp/, $(slirp-obj-y))
 
 # xen backend driver support
-common-obj-$(CONFIG_XEN) += xen_backend.o xen_devconfig.o
-common-obj-$(CONFIG_XEN) += xen_console.o xenfb.o xen_disk.o xen_nic.o
+common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o
+common-obj-$(CONFIG_XEN_BACKEND) += xen_console.o xenfb.o xen_disk.o xen_nic.o
 
 ######################################################################
 # libuser

Makefile.target

@@ -3,6 +3,8 @@
 GENERATED_HEADERS = config-target.h
 CONFIG_NO_PCI = $(if $(subst n,,$(CONFIG_PCI)),n,y)
 CONFIG_NO_KVM = $(if $(subst n,,$(CONFIG_KVM)),n,y)
+CONFIG_NO_XEN = $(if $(subst n,,$(CONFIG_XEN)),n,y)
+CONFIG_NO_XEN_MAPCACHE = $(if $(subst n,,$(CONFIG_XEN_MAPCACHE)),n,y)
 
 include ../config-host.mak
 include config-devices.mak
@@ -204,17 +206,8 @@ QEMU_CFLAGS += $(VNC_SASL_CFLAGS)
 QEMU_CFLAGS += $(VNC_JPEG_CFLAGS)
 QEMU_CFLAGS += $(VNC_PNG_CFLAGS)
 
-# xen backend driver support
-obj-i386-$(CONFIG_XEN) += xen_machine_pv.o xen_domainbuild.o
-
-ifeq ($(TARGET_BASE_ARCH), i386)
-  CONFIG_NO_XEN = $(if $(subst n,,$(CONFIG_XEN)),n,y)
-else
-  CONFIG_NO_XEN = y
-endif
 # xen support
-CONFIG_NO_XEN_MAPCACHE = $(if $(subst n,,$(CONFIG_XEN_MAPCACHE)),n,y)
-obj-i386-$(CONFIG_XEN) += xen-all.o
+obj-$(CONFIG_XEN) += xen-all.o xen_machine_pv.o xen_domainbuild.o
 obj-$(CONFIG_NO_XEN) += xen-stub.o
 obj-i386-$(CONFIG_XEN_MAPCACHE) += xen-mapcache.o
 obj-$(CONFIG_NO_XEN_MAPCACHE) += xen-mapcache-stub.o

configure

@@ -2850,7 +2850,7 @@ if test "$bluez" = "yes" ; then
   echo "BLUEZ_CFLAGS=$bluez_cflags" >> $config_host_mak
 fi
 if test "$xen" = "yes" ; then
-  echo "CONFIG_XEN=y" >> $config_host_mak
+  echo "CONFIG_XEN_BACKEND=y" >> $config_host_mak
   echo "CONFIG_XEN_CTRL_INTERFACE_VERSION=$xen_ctrl_version" >> $config_host_mak
 fi
 if test "$io_thread" = "yes" ; then