[Xen-devel] [PATCH 2/4] mm: Don't poison a page if boot-time scrubbing is off

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

If boot-time scrubbing is turned off we don't check pages in
check_one_page(). Thus there is no reason to ever poison them.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
 xen/common/page_alloc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 7d56e92..34a7992 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -712,6 +712,9 @@ static void poison_one_page(struct page_info *pg)
     mfn_t mfn = _mfn(page_to_mfn(pg));
     uint64_t *ptr;
 
+    if ( !boot_scrub_done )
+        return;
+
     ptr = map_domain_page(mfn);
     *ptr = ~SCRUB_PATTERN;
     unmap_domain_page(ptr);
-- 
1.8.3.1


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