[win-pv-devel] [PATCH] Reserve some grant entries for the crash kernel

[Paul Durrant <pdurrant@xxxxxxxxx>]

The xencrsh driver (which is loaded into the crash kernel) needs some grant
entries to write out the dump file. It is important that these entries are
guaranteed to be unused by any backend other than the one the xencrsh uses
so reserve them in the normal grant table.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
---
 src/xenbus/gnttab.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/xenbus/gnttab.c b/src/xenbus/gnttab.c
index 8a88986..8b73f27 100644
--- a/src/xenbus/gnttab.c
+++ b/src/xenbus/gnttab.c
@@ -45,8 +45,8 @@
 #define XENBUS_GNTTAB_ENTRY_PER_FRAME      (PAGE_SIZE / sizeof 
(grant_entry_v1_t))
 
 // Xen requires that we avoid the first 8 entries of the table and
-// we also reserve 1 entry for the crash kernel
-#define XENBUS_GNTTAB_RESERVED_ENTRY_COUNT 9
+// we also reserve some more room for the crash kernel
+#define XENBUS_GNTTAB_RESERVED_ENTRY_COUNT 32
 
 #define XENBUS_GNTTAB_ENTRY_MAGIC 'DTNG'
 
-- 
2.1.1


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