[3.5.y.z extended stable] Patch "s390/dump: Fix dump memory detection" has been added to staging queue
Luis Henriques
luis.henriques at canonical.com
Fri Feb 21 12:59:07 UTC 2014
This is a note to let you know that I have just added a patch titled
s390/dump: Fix dump memory detection
to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree
which can be found at:
http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From afe329c2203dbac80b6fd67440a1a9dae800bc65 Mon Sep 17 00:00:00 2001
From: Michael Holzheu <holzheu at linux.vnet.ibm.com>
Date: Thu, 30 Jan 2014 16:14:02 +0100
Subject: s390/dump: Fix dump memory detection
commit d7736ff5be31edaa4fe5ab62810c64529a24b149 upstream.
Dumps created by kdump or zfcpdump can contain invalid memory holes when
dumping z/VM systems that have memory pressure.
For example:
# zgetdump -i /proc/vmcore.
Memory map:
0000000000000000 - 0000000000bfffff (12 MB)
0000000000e00000 - 00000000014fffff (7 MB)
000000000bd00000 - 00000000f3bfffff (3711 MB)
The memory detection function find_memory_chunks() issues tprot to
find valid memory chunks. In case of CMM it can happen that pages are
marked as unstable via set_page_unstable() in arch_free_page().
If z/VM has released that pages, tprot returns -EFAULT and indicates
a memory hole.
So fix this and switch off CMM in case of kdump or zfcpdump.
Signed-off-by: Michael Holzheu <holzheu at linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky at de.ibm.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
arch/s390/mm/page-states.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/s390/mm/page-states.c b/arch/s390/mm/page-states.c
index a90d45e..27c50f4 100644
--- a/arch/s390/mm/page-states.c
+++ b/arch/s390/mm/page-states.c
@@ -12,6 +12,8 @@
#include <linux/mm.h>
#include <linux/gfp.h>
#include <linux/init.h>
+#include <asm/setup.h>
+#include <asm/ipl.h>
#define ESSA_SET_STABLE 1
#define ESSA_SET_UNUSED 2
@@ -41,6 +43,14 @@ void __init cmma_init(void)
if (!cmma_flag)
return;
+ /*
+ * Disable CMM for dump, otherwise the tprot based memory
+ * detection can fail because of unstable pages.
+ */
+ if (OLDMEM_BASE || ipl_info.type == IPL_TYPE_FCP_DUMP) {
+ cmma_flag = 0;
+ return;
+ }
asm volatile(
" .insn rrf,0xb9ab0000,%1,%1,0,0\n"
"0: la %0,0\n"
--
1.9.0
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