[Xen-devel] [PATCH v3 06/10] xen: Initialize xenbus for dom0.

[Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>]

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.

[ Impact: initialize Xenbus ]

Signed-off-by: Juan Quintela <quintela@xxxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 drivers/xen/xenbus/xenbus_probe.c |   29 ++++++++++++++++++++++++++++-
 1 files changed, 28 insertions(+), 1 deletions(-)

diff --git a/drivers/xen/xenbus/xenbus_probe.c 
b/drivers/xen/xenbus/xenbus_probe.c
index 29bac51..df0049e 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -798,6 +798,7 @@ device_initcall(xenbus_probe_initcall);
 static int __init xenbus_init(void)
 {
        int err = 0;
+       unsigned long page = 0;
 
        DPRINTK("");
 
@@ -818,7 +819,31 @@ 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;
@@ -864,6 +889,8 @@ static int __init xenbus_init(void)
        bus_unregister(&xenbus_frontend.bus);
 
   out_error:
+       if (page != 0)
+               free_page(page);
        return err;
 }
 
-- 
1.5.6.5


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