xenstore: setup xenstore stubdom console interface properly

In order to be able to get access to the console of Xenstore stubdom
we need an appropriate granttab entry. So call xc_dom_gnttab_init()
when constructing the domain and preset some information needed
for that function in the dom structure.

We need to create the event channel for the console, too. Do that and
store all necessary data locally.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Wei Liu <wl@xen.org>

tools/helpers/init-xenstore-domain.c

@@ -24,6 +24,7 @@ static char *param;
 static char *name = "Xenstore";
 static int memory;
 static int maxmem;
+static xc_evtchn_port_or_error_t console_evtchn;
 
 static struct option options[] = {
     { "kernel", 1, NULL, 'k' },
@@ -113,6 +114,12 @@ static int build(xc_interface *xch)
         fprintf(stderr, "xc_domain_setmaxmem failed\n");
         goto err;
     }
+    console_evtchn = xc_evtchn_alloc_unbound(xch, domid, 0);
+    if ( console_evtchn < 0 )
+    {
+        fprintf(stderr, "xc_evtchn_alloc_unbound failed\n");
+        goto err;
+    }
     rv = xc_domain_set_memmap_limit(xch, domid, limit_kb);
     if ( rv )
     {
@@ -133,6 +140,15 @@ static int build(xc_interface *xch)
         snprintf(cmdline, 512, "--event %d --internal-db", rv);
 
     dom = xc_dom_allocate(xch, cmdline, NULL);
+    if ( !dom )
+    {
+        fprintf(stderr, "xc_dom_allocate failed\n");
+        goto err;
+    }
+    dom->container_type = XC_DOM_PV_CONTAINER;
+    dom->xenstore_domid = domid;
+    dom->console_evtchn = console_evtchn;
+
     rv = xc_dom_kernel_file(dom, kernel);
     if ( rv )
     {
@@ -186,6 +202,12 @@ static int build(xc_interface *xch)
         fprintf(stderr, "xc_dom_boot_image failed\n");
         goto err;
     }
+    rv = xc_dom_gnttab_init(dom);
+    if ( rv )
+    {
+        fprintf(stderr, "xc_dom_gnttab_init failed\n");
+        goto err;
+    }
 
     rv = xc_domain_set_virq_handler(xch, domid, VIRQ_DOM_EXC);
     if ( rv )