xen: Add xc_domain_add_to_physmap to xen_interface.

This function will be used to support sync dirty bitmap.

This come with a check against every Xen release, and special
implementation for Xen version that doesn't have this specific call.

This function will not be usable with Xen 3.3 because the behavior is
different.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

configure

@@ -1210,6 +1210,7 @@ int main(void) {
   xc = xc_interface_open(0, 0, 0);
   xc_hvm_set_mem_type(0, 0, HVMMEM_ram_ro, 0, 0);
   xc_gnttab_open(NULL, 0);
+  xc_domain_add_to_physmap(0, 0, XENMAPSPACE_gmfn, 0, 0);
   return 0;
 }
 EOF
@@ -1228,10 +1229,14 @@ EOF
 # error HVM_MAX_VCPUS not defined
 #endif
 int main(void) {
+  struct xen_add_to_physmap xatp = {
+    .domid = 0, .space = XENMAPSPACE_gmfn, .idx = 0, .gpfn = 0,
+  };
   xs_daemon_open();
   xc_interface_open();
   xc_gnttab_open();
   xc_hvm_set_mem_type(0, 0, HVMMEM_ram_ro, 0, 0);
+  xc_memory_op(0, XENMEM_add_to_physmap, &xatp);
   return 0;
 }
 EOF
@@ -1240,7 +1245,29 @@ EOF
     xen_ctrl_version=400
     xen=yes
 
-  # Xen 3.3.0, 3.4.0
+  # Xen 3.4.0
+  elif (
+      cat > $TMPC <<EOF
+#include <xenctrl.h>
+#include <xs.h>
+int main(void) {
+  struct xen_add_to_physmap xatp = {
+    .domid = 0, .space = XENMAPSPACE_gmfn, .idx = 0, .gpfn = 0,
+  };
+  xs_daemon_open();
+  xc_interface_open();
+  xc_gnttab_open();
+  xc_hvm_set_mem_type(0, 0, HVMMEM_ram_ro, 0, 0);
+  xc_memory_op(0, XENMEM_add_to_physmap, &xatp);
+  return 0;
+}
+EOF
+      compile_prog "" "$xen_libs"
+    ) ; then
+    xen_ctrl_version=340
+    xen=yes
+
+  # Xen 3.3.0
   elif (
       cat > $TMPC <<EOF
 #include <xenctrl.h>

hw/xen_common.h

@@ -71,6 +71,20 @@ static inline int xc_domain_populate_physmap_exact
         (xc_handle, domid, nr_extents, extent_order, mem_flags, extent_start);
 }
 
+static inline int xc_domain_add_to_physmap(int xc_handle, uint32_t domid,
+                                           unsigned int space, unsigned long idx,
+                                           xen_pfn_t gpfn)
+{
+    struct xen_add_to_physmap xatp = {
+        .domid = domid,
+        .space = space,
+        .idx = idx,
+        .gpfn = gpfn,
+    };
+
+    return xc_memory_op(xc_handle, XENMEM_add_to_physmap, &xatp);
+}
+
 
 /* Xen 4.1 */
 #else