[PATCH 5 of 7] Tools: libxc side for setting up the mem sharing ring

[Andres Lagar-Cavilla <andres@lagarcavilla.org>]

 tools/libxc/xc_memshr.c |  25 +++++++++++++++++++++++++
 tools/libxc/xenctrl.h   |   5 +++++
 2 files changed, 30 insertions(+), 0 deletions(-)


This ring is used to report failed allocations in the unshare path.

Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>

diff -r 07f131352fc0 -r d3d824ae525c tools/libxc/xc_memshr.c
--- a/tools/libxc/xc_memshr.c
+++ b/tools/libxc/xc_memshr.c
@@ -42,6 +42,31 @@ int xc_memshr_control(xc_interface *xch,
     return do_domctl(xch, &domctl);
 }
 
+int xc_memshr_ring_enable(xc_interface *xch, 
+                          domid_t domid, 
+                          uint32_t *port)
+{
+    if ( !port )
+    {
+        errno = EINVAL;
+        return -1;
+    }
+        
+    return xc_mem_event_control(xch, domid,
+                                XEN_DOMCTL_MEM_EVENT_OP_SHARING_ENABLE,
+                                XEN_DOMCTL_MEM_EVENT_OP_SHARING,
+                                port);
+}
+
+int xc_memshr_ring_disable(xc_interface *xch, 
+                           domid_t domid)
+{
+    return xc_mem_event_control(xch, domid,
+                                XEN_DOMCTL_MEM_EVENT_OP_SHARING_DISABLE,
+                                XEN_DOMCTL_MEM_EVENT_OP_SHARING,
+                                NULL);
+}
+
 static int xc_memshr_memop(xc_interface *xch, domid_t domid, 
                             xen_mem_sharing_op_t *mso)
 {
diff -r 07f131352fc0 -r d3d824ae525c tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -1915,6 +1915,11 @@ int xc_mem_access_resume(xc_interface *x
 int xc_memshr_control(xc_interface *xch,
                       domid_t domid,
                       int enable);
+int xc_memshr_ring_enable(xc_interface *xch, 
+                          domid_t domid, 
+                          uint32_t *port);
+int xc_memshr_ring_disable(xc_interface *xch, 
+                           domid_t domid);
 int xc_memshr_nominate_gfn(xc_interface *xch,
                            domid_t domid,
                            unsigned long gfn,