xend: populate HVM guest grant table on boot

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

tools/python/xen/lowlevel/xc/xc.c

@@ -1008,6 +1008,30 @@ static PyObject *pyxc_hvm_build(XcObject *self,
     return Py_BuildValue("{}");
 }
 
+static PyObject *pyxc_gnttab_hvm_seed(XcObject *self,
+				      PyObject *args,
+				      PyObject *kwds)
+{
+    uint32_t dom, console_domid, xenstore_domid;
+    unsigned long xenstore_gmfn = 0;
+    unsigned long console_gmfn = 0;
+    static char *kwd_list[] = { "domid",
+				"console_gmfn", "xenstore_gmfn",
+				"console_domid", "xenstore_domid", NULL };
+    if ( !PyArg_ParseTupleAndKeywords(args, kwds, "iiiii", kwd_list,
+                                      &dom,
+				      &console_gmfn, &xenstore_gmfn,
+				      &console_domid, &xenstore_domid) )
+        return NULL;
+
+    if ( xc_dom_gnttab_hvm_seed(self->xc_handle, dom,
+				console_gmfn, xenstore_gmfn,
+				console_domid, xenstore_domid) != 0 )
+        return pyxc_error_to_exception(self->xc_handle);
+
+    return Py_None;
+}
+
 static PyObject *pyxc_evtchn_alloc_unbound(XcObject *self,
                                            PyObject *args,
                                            PyObject *kwds)
@@ -2439,6 +2463,17 @@ static PyMethodDef pyxc_methods[] = {
       " vcpu_avail [long, 1]: Which Virtual CPUS available.\n\n"
       "Returns: [int] 0 on success; -1 on error.\n" },
 
+    { "gnttab_hvm_seed",
+      (PyCFunction)pyxc_gnttab_hvm_seed,
+      METH_KEYWORDS, "\n"
+      "Initialise HVM guest grant table.\n"
+      " dom     [int]:      Identifier of domain to build into.\n"
+      " console_gmfn [int]: \n"
+      " xenstore_gmfn [int]: \n"
+      " console_domid [int]: \n"
+      " xenstore_domid [int]: \n"
+      "Returns: None on sucess. Raises exception on error.\n" },
+
     { "hvm_get_param", 
       (PyCFunction)pyxc_get_hvm_param, 
       METH_VARARGS | METH_KEYWORDS, "\n"

tools/python/xen/xend/XendConstants.py

@@ -52,6 +52,7 @@ HVM_PARAM_TIMER_MODE   = 10
 HVM_PARAM_HPET_ENABLED = 11
 HVM_PARAM_ACPI_S_STATE = 14
 HVM_PARAM_VPT_ALIGN    = 16
+HVM_PARAM_CONSOLE_PFN  = 17
 HVM_PARAM_NESTEDHVM    = 24 # x86
 
 restart_modes = [

tools/python/xen/xend/image.py

@@ -971,6 +971,13 @@ class HVMImageHandler(ImageHandler):
         xc.hvm_set_param(self.vm.getDomid(), HVM_PARAM_STORE_EVTCHN,
                          store_evtchn)
 
+        console_mfn = xc.hvm_get_param(self.vm.getDomid(), HVM_PARAM_CONSOLE_PFN)
+        xc.gnttab_hvm_seed(domid = self.vm.getDomid(),
+                           console_gmfn = console_mfn,
+                           xenstore_gmfn = rc['store_mfn'],
+                           console_domid = 0,
+                           xenstore_domid = 0)
+
         return rc