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From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: xen-devel@lists.xen.org
Cc: sstabellini@kernel.org, wei.liu2@citrix.com,
	George.Dunlap@eu.citrix.com, andrew.cooper3@citrix.com,
	ian.jackson@eu.citrix.com, tim@xen.org, jbeulich@suse.com,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: [PATCH 2/4] mm: Don't poison a page if boot-time scrubbing is off
Date: Mon, 28 Aug 2017 16:40:27 -0400	[thread overview]
Message-ID: <1503952829-11065-3-git-send-email-boris.ostrovsky@oracle.com> (raw)
In-Reply-To: <1503952829-11065-1-git-send-email-boris.ostrovsky@oracle.com>

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@oracle.com>
---
 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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  parent reply	other threads:[~2017-08-28 20:40 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-28 20:40 [PATCH 0/4] Scrubbing updates Boris Ostrovsky
2017-08-28 20:40 ` [PATCH 1/4] mm: Initialize lowmem virq when boot-time scrubbing is disabled Boris Ostrovsky
2017-08-29 11:51   ` Wei Liu
2017-08-29 13:12     ` Boris Ostrovsky
2017-08-29 13:20       ` Jan Beulich
2017-08-29 13:19     ` Jan Beulich
2017-08-28 20:40 ` Boris Ostrovsky [this message]
2017-08-29 11:52   ` [PATCH 2/4] mm: Don't poison a page if boot-time scrubbing is off Wei Liu
2017-08-28 20:40 ` [PATCH 3/4] mm: Don't request scrubbing until dom0 is running Boris Ostrovsky
2017-08-29 11:56   ` Wei Liu
2017-08-29 13:22     ` Jan Beulich
2017-08-29 13:27       ` Boris Ostrovsky
2017-08-29 13:34         ` Jan Beulich
2017-08-29 14:20           ` Boris Ostrovsky
2017-08-29 14:25             ` Jan Beulich
2017-08-29 13:26   ` Jan Beulich
2017-08-29 13:31     ` Wei Liu
2017-08-28 20:40 ` [PATCH 4/4] mm: Don't hold heap lock in alloc_heap_pages() longer than necessary Boris Ostrovsky
2017-08-29 12:16   ` Wei Liu
2017-08-29 13:33   ` Jan Beulich

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