From: Juan Quintela <quintela@xxxxxxxxxx>
Do initial xenbus/xenstore setup in dom0. In dom0 we need to actually
allocate the xenstore resources, rather than being given them from
outside.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Signed-off-by: Juan Quintela <quintela@xxxxxxxxxx>
---
 drivers/xen/xenbus/xenbus_probe.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)
diff --git a/drivers/xen/xenbus/xenbus_probe.c 
b/drivers/xen/xenbus/xenbus_probe.c
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -818,6 +818,7 @@
 static int __init xenbus_probe_init(void)
 {
 int err = 0;
+ unsigned long page = 0;
 
 DPRINTK("");
 
@@ -838,7 +839,31 @@
 * Domain0 doesn't have a store_evtchn or store_mfn yet.
 */
 if (xen_initial_domain()) {
- /* dom0 not yet supported */
+ struct evtchn_alloc_unbound alloc_unbound;
+
+ /* Allocate Xenstore page */
+ page = get_zeroed_page(GFP_KERNEL);
+ if (!page)
+ return -ENOMEM;
+
+ xen_store_mfn = xen_start_info->store_mfn =
+ pfn_to_mfn(virt_to_phys((void *)page) >>
+ PAGE_SHIFT);
+
+ /* Next allocate a local port which xenstored can bind to */
+ alloc_unbound.dom = DOMID_SELF;
+ alloc_unbound.remote_dom = 0;
+
+ err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
+ &alloc_unbound);
+ if (err == -ENOSYS)
+ goto out_unreg_front;
+
+ BUG_ON(err);
+ xen_store_evtchn = xen_start_info->store_evtchn =
+ alloc_unbound.port;
+
+ xen_store_interface = mfn_to_virt(xen_store_mfn);
 } else {
 xenstored_ready = 1;
 xen_store_evtchn = xen_start_info->store_evtchn;
@@ -874,6 +899,9 @@
 bus_unregister(&xenbus_frontend.bus);
 
 out_error:
+ if (page != 0)
+ free_page(page);
+
 return err;
 }
 
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