[Xen-changelog] [xen-unstable] Grant table: fix a bug when grant copying a previous grant mapped page.

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Wei Liu <wei.liu2@xxxxxxxxxx>
# Date 1330619838 0
# Node ID 9ef985f5e6a57d2e78d27c5f0f64e6a049d8d1ff
# Parent  ce5ef8a192c1050d85580305921d2e5caf220461
Grant table: fix a bug when grant copying a previous grant mapped page.

In grant table version 2, when we create a non-transitive mapping from
DomU to Dom0, we need to set active entry's trans_domain and
trans_ref.  Otherwise when we grant copy from this previous mapped
ref, preemption count will get messed up.

See changeset 22994:299ed79acecf for more information.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Committed-by: Keir Fraser <keir@xxxxxxx>
---


diff -r ce5ef8a192c1 -r 9ef985f5e6a5 xen/common/grant_table.c
--- a/xen/common/grant_table.c  Thu Mar 01 16:35:54 2012 +0000
+++ b/xen/common/grant_table.c  Thu Mar 01 16:37:18 2012 +0000
@@ -585,6 +585,8 @@
             act->start = 0;
             act->length = PAGE_SIZE;
             act->is_sub_page = 0;
+            act->trans_domain = rd;
+            act->trans_gref = op->ref;
         }
     }
 

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