[Xen-devel] [PATCH 1/4] xen: asm-x86: introduce PGC_need_scrub page flag

[Bob Liu <lliubbo@xxxxxxxxx>]

To indicate a page is free but need to be scrubbed before in use.

Signed-off-by: Bob Liu <bob.liu@xxxxxxxxxx>
---
 xen/include/asm-x86/mm.h |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h
index 7059adc..660fc33 100644
--- a/xen/include/asm-x86/mm.h
+++ b/xen/include/asm-x86/mm.h
@@ -223,9 +223,12 @@ struct page_info
 #define PGC_state_offlined PG_mask(2, 9)
 #define PGC_state_free    PG_mask(3, 9)
 #define page_state_is(pg, st) (((pg)->count_info&PGC_state) == PGC_state_##st)
+/* Page need to be scrubbed */
+#define _PGC_need_scrub   PG_shift(10)
+#define PGC_need_scrub    PG_mask(1, 10)
 
  /* Count of references to this frame. */
-#define PGC_count_width   PG_shift(9)
+#define PGC_count_width   PG_shift(10)
 #define PGC_count_mask    ((1UL<<PGC_count_width)-1)
 
 struct spage_info
-- 
1.7.10.4


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