This is a note to let you know that I've just added the patch titled
s390/cachinfo: add missing facility check to init_cache_level()
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-cachinfo-add-missing-facility-check-to-init_cache_level.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0b991f5cdcd6201e5401f83ca3a672343c3bfc49 Mon Sep 17 00:00:00 2001
From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Date: Mon, 27 Jul 2015 09:53:49 +0200
Subject: s390/cachinfo: add missing facility check to init_cache_level()
From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
commit 0b991f5cdcd6201e5401f83ca3a672343c3bfc49 upstream.
Stephen Powell reported the following crash on a z890 machine:
Kernel BUG at 00000000001219d0 [verbose debug info unavailable]
illegal operation: 0001 ilc:3 [#1] SMP
Krnl PSW : 0704e00180000000 00000000001219d0 (init_cache_level+0x38/0xe0)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 EA:3
Krnl Code: 00000000001219c2: a7840056 brc 8,121a6e
00000000001219c6: a7190000 lghi %r1,0
#00000000001219ca: eb101000004c ecag %r1,%r0,0(%r1)
>00000000001219d0: a7390000 lghi %r3,0
00000000001219d4: e310f0a00024 stg %r1,160(%r15)
00000000001219da: a7080000 lhi %r0,0
00000000001219de: a7b9f000 lghi %r11,-4096
00000000001219e2: c0a0002899d9 larl %r10,634d94
Call Trace:
[<0000000000478ee2>] detect_cache_attributes+0x2a/0x2b8
[<000000000097c9b0>] cacheinfo_sysfs_init+0x60/0xc8
[<00000000001001c0>] do_one_initcall+0x98/0x1c8
[<000000000094fdc2>] kernel_init_freeable+0x212/0x2d8
[<000000000062352e>] kernel_init+0x26/0x118
[<000000000062fd2e>] kernel_thread_starter+0x6/0xc
The illegal operation was executed because of a missing facility check,
which should have made sure that the ECAG execution would only be executed
on machines which have the general-instructions-extension facility
installed.
Reported-and-tested-by: Stephen Powell <zlinuxman@xxxxxxxxxx>
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/kernel/cache.c | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/s390/kernel/cache.c
+++ b/arch/s390/kernel/cache.c
@@ -138,6 +138,8 @@ int init_cache_level(unsigned int cpu)
union cache_topology ct;
enum cache_type ctype;
+ if (!test_facility(34))
+ return -EOPNOTSUPP;
if (!this_cpu_ci)
return -EINVAL;
ct.raw = ecag(EXTRACT_TOPOLOGY, 0, 0);
Patches currently in stable-queue which might be from heiko.carstens@xxxxxxxxxx are
queue-4.1/s390-cachinfo-add-missing-facility-check-to-init_cache_level.patch
queue-4.1/s390-process-fix-sfpc-inline-assembly.patch
queue-4.1/s390-nmi-fix-vector-register-corruption.patch
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