libxc: add xc_gntshr_* functions

These functions and the xc_gntshr device (/dev/xen/gntalloc on linux)
allow applications to create pages shared with other domains.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/tools/libxc/xc_private.c b/tools/libxc/xc_private.c
index 09c8f23ca5..09a91e75ad 100644
--- a/tools/libxc/xc_private.c
+++ b/tools/libxc/xc_private.c
@@ -258,6 +258,19 @@ int xc_gnttab_close(xc_gnttab *xcg)
     return xc_interface_close_common(xcg);
 }
 
+xc_gntshr *xc_gntshr_open(xentoollog_logger *logger,
+                             unsigned open_flags)
+{
+    return xc_interface_open_common(logger, NULL, open_flags,
+                                    XC_OSDEP_GNTSHR);
+}
+
+int xc_gntshr_close(xc_gntshr *xcg)
+{
+    return xc_interface_close_common(xcg);
+}
+
+
 static pthread_key_t errbuf_pkey;
 static pthread_once_t errbuf_pkey_once = PTHREAD_ONCE_INIT;