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path: root/drivers/xen/xenbus/xenbus_probe.c
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Diffstat (limited to 'drivers/xen/xenbus/xenbus_probe.c')
-rw-r--r--drivers/xen/xenbus/xenbus_probe.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 132939f3602..deb9c4ba3a9 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -803,6 +803,7 @@ device_initcall(xenbus_probe_initcall);
static int __init xenbus_init(void)
{
int err = 0;
+ unsigned long page = 0;
DPRINTK("");
@@ -823,7 +824,31 @@ static int __init xenbus_init(void)
* 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)
+ goto out_error;
+
+ 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_error;
+
+ BUG_ON(err);
+ xen_store_evtchn = xen_start_info->store_evtchn =
+ alloc_unbound.port;
+
+ xen_store_interface = mfn_to_virt(xen_store_mfn);
} else {
if (xen_hvm_domain()) {
uint64_t v = 0;
@@ -869,6 +894,8 @@ static int __init xenbus_init(void)
bus_unregister(&xenbus_frontend.bus);
out_error:
+ if (page != 0)
+ free_page(page);
return err;
}