[RFC PATCH 3/4] hw/xen/Kconfig: Introduce XEN_PV config

[Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>]

xenpv machine requires USB, IDE_PIIX and PCI:

  /usr/bin/ld:
  libcommon.fa.p/hw_xen_xen-legacy-backend.c.o: in function 
`xen_be_register_common':
  hw/xen/xen-legacy-backend.c:757: undefined reference to `xen_usb_ops'
  libqemu-i386-softmmu.fa.p/hw_i386_xen_xen_platform.c.o: in function 
`unplug_disks':
  hw/i386/xen/xen_platform.c:153: undefined reference to 
`pci_piix3_xen_ide_unplug'
  libqemu-i386-softmmu.fa.p/hw_i386_xen_xen_platform.c.o: in function 
`pci_unplug_nics':
  hw/i386/xen/xen_platform.c:137: undefined reference to `pci_for_each_device'
  libqemu-i386-softmmu.fa.p/hw_i386_xen_xen_platform.c.o: in function 
`xen_platform_realize':
  hw/i386/xen/xen_platform.c:483: undefined reference to `pci_register_bar'

Signed-off-by: Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>
---
 hw/Kconfig     | 1 +
 hw/xen/Kconfig | 6 ++++++
 2 files changed, 7 insertions(+)
 create mode 100644 hw/xen/Kconfig

diff --git a/hw/Kconfig b/hw/Kconfig
index 5ad3c6b5a4b..f2a95591d94 100644
--- a/hw/Kconfig
+++ b/hw/Kconfig
@@ -39,6 +39,7 @@ source usb/Kconfig
 source virtio/Kconfig
 source vfio/Kconfig
 source watchdog/Kconfig
+source xen/Kconfig
 
 # arch Kconfig
 source arm/Kconfig
diff --git a/hw/xen/Kconfig b/hw/xen/Kconfig
new file mode 100644
index 00000000000..15944144a17
--- /dev/null
+++ b/hw/xen/Kconfig
@@ -0,0 +1,6 @@
+config XEN_PV
+    bool
+    depends on XEN
+    select PCI
+    select USB
+    select IDE_PIIX
-- 
2.26.2