[Xen-devel] [PATCH] xen: only clobber multicall elements without error

[Juergen Gross <jgross@xxxxxxxx>]

In debug builds the hypervisor will deliberately clobber processed
elements of the multicall structure. In order to ease diagnostic data
printout in the affected guest only clobber elements which didn't
return an error.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 xen/common/multicall.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/common/multicall.c b/xen/common/multicall.c
index 5a199ebf8f..48622619ce 100644
--- a/xen/common/multicall.c
+++ b/xen/common/multicall.c
@@ -74,6 +74,7 @@ do_multicall(
         ASSERT_NOT_IN_ATOMIC();
 
 #ifndef NDEBUG
+        if ( (long)mcs->call.result >= 0 )
         {
             /*
              * Deliberately corrupt the contents of the multicall structure.
-- 
2.16.4


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