Add a GNTTABOP to swap the content of two grant references under lock

provided that they are not currently active.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Committed-by: Keir Fraser <keir@xen.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/xen/common/compat/grant_table.c b/xen/common/compat/grant_table.c
index ca60395f0a..edd20c6bd3 100644
--- a/xen/common/compat/grant_table.c
+++ b/xen/common/compat/grant_table.c
@@ -47,6 +47,10 @@ DEFINE_XEN_GUEST_HANDLE(gnttab_get_status_frames_compat_t);
 CHECK_gnttab_get_version;
 #undef xen_gnttab_get_version
 
+#define xen_gnttab_swap_grant_ref gnttab_swap_grant_ref
+CHECK_gnttab_swap_grant_ref;
+#undef xen_gnttab_swap_grant_ref
+
 int compat_grant_table_op(unsigned int cmd,
                           XEN_GUEST_HANDLE(void) cmp_uop,
                           unsigned int count)
@@ -98,6 +102,10 @@ int compat_grant_table_op(unsigned int cmd,
     CASE(get_status_frames);
 #endif
 
+#ifndef CHECK_gnttab_swap_grant_ref
+    CASE(swap_grant_ref);
+#endif
+
 #undef CASE
     default:
         return do_grant_table_op(cmd, cmp_uop, count);