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, 2 insertions, 2 deletions

diff --git a/sys/dev/xen/timer/timer.c b/sys/dev/xen/timer/timer.c
index ed611d0..5743076 100644
--- a/sys/dev/xen/timer/timer.c
+++ b/sys/dev/xen/timer/timer.c
@@ -645,5 +645,5 @@ static driver_t xentimer_driver = {
 	sizeof(struct xentimer_softc),
 };
 
-DRIVER_MODULE(xentimer, nexus, xentimer_driver, xentimer_devclass, 0, 0);
-MODULE_DEPEND(xentimer, nexus, 1, 1, 1);
+DRIVER_MODULE(xentimer, xenpv, xentimer_driver, xentimer_devclass, 0, 0);
+MODULE_DEPEND(xentimer, xenpv, 1, 1, 1);