xen: introduce xenpv bus

Create a dummy bus so top level Xen devices can attach to it (instead
of attaching directly to the nexus). This allows to have all the Xen
related devices grouped under a single bus.

Sponsored by: Citrix Systems R&D
Approved by: gibbs

x86/xen/xenpv.c:
 - Attach the xenpv bus when running as a Xen guest.
 - Attach the ISA bus if needed, in order to attach syscons.

conf/files.amd6:
conf/files.i386:
 - Include the xenpv.c file in the build of i386/amd64 kernels using
   XENHVM.

dev/xen/console/console.c:
dev/xen/timer/timer.c:
xen/xenstore/xenstore.c:
 - Attach to the xenpv bus instead of the Nexus.

dev/xen/xenpci/xenpci.c:
 - Xen specific devices on PVHVM guests are no longer attached to the
   xenpci device, they are instead attached to the xenpv bus, remove
   the now unused methods.

1 files changed, 1 insertions, 5 deletions

diff --git a/sys/xen/xenstore/xenstore.c b/sys/xen/xenstore/xenstore.c
index d404862..b5cf413 100644
--- a/sys/xen/xenstore/xenstore.c
+++ b/sys/xen/xenstore/xenstore.c
@@ -1261,11 +1261,7 @@ static device_method_t xenstore_methods[] = {
 DEFINE_CLASS_0(xenstore, xenstore_driver, xenstore_methods, 0);
 static devclass_t xenstore_devclass; 
  
-#ifdef XENHVM
-DRIVER_MODULE(xenstore, xenpci, xenstore_driver, xenstore_devclass, 0, 0);
-#else
-DRIVER_MODULE(xenstore, nexus, xenstore_driver, xenstore_devclass, 0, 0);
-#endif
+DRIVER_MODULE(xenstore, xenpv, xenstore_driver, xenstore_devclass, 0, 0);
 
 /*------------------------------- Sysctl Data --------------------------------*/
 /* XXX Shouldn't the node be somewhere else? */