[ 3.5.y.z extended stable ] Patch "s390: critical section cleanup vs. machine checks" has been added to staging queue
Luis Henriques
luis.henriques at canonical.com
Wed Mar 20 10:43:47 UTC 2013
This is a note to let you know that I have just added a patch titled
s390: critical section cleanup vs. machine checks
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 3f24baf25d0ddadb54fe9cff8be7de1c6226d783 Mon Sep 17 00:00:00 2001
From: Martin Schwidefsky <schwidefsky at de.ibm.com>
Date: Thu, 28 Feb 2013 16:28:41 +0100
Subject: [PATCH] s390: critical section cleanup vs. machine checks
commit 6551fbdfd8b85d1ab5822ac98abb4fb449bcfae0 upstream.
The current machine check code uses the registers stored by the machine
in the lowcore at __LC_GPREGS_SAVE_AREA as the registers of the interrupted
context. The registers 0-7 of a user process can get clobbered if a machine
checks interrupts the execution of a critical section in entry[64].S.
The reason is that the critical section cleanup code may need to modify
the PSW and the registers for the previous context to get to the end of a
critical section. If registers 0-7 have to be replaced the relevant copy
will be in the registers, which invalidates the copy in the lowcore. The
machine check handler needs to explicitly store registers 0-7 to the stack.
Signed-off-by: Martin Schwidefsky <schwidefsky at de.ibm.com>
Luis Henriques <luis.henriques at canonical.com>
---
arch/s390/kernel/entry.S | 3 ++-
arch/s390/kernel/entry64.S | 5 +++--
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 1ae93b5..b48e939 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -670,7 +670,8 @@ ENTRY(mcck_int_handler)
UPDATE_VTIME %r14,%r15,__LC_MCCK_ENTER_TIMER
mcck_skip:
SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+32,__LC_PANIC_STACK,PAGE_SHIFT
- mvc __PT_R0(64,%r11),__LC_GPREGS_SAVE_AREA
+ stm %r0,%r7,__PT_R0(%r11)
+ mvc __PT_R8(32,%r11),__LC_GPREGS_SAVE_AREA+32
stm %r8,%r9,__PT_PSW(%r11)
xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
l %r1,BASED(.Ldo_machine_check)
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 229fe1d..db8d885 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -697,8 +697,9 @@ ENTRY(mcck_int_handler)
UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER
LAST_BREAK %r14
mcck_skip:
- lghi %r14,__LC_GPREGS_SAVE_AREA
- mvc __PT_R0(128,%r11),0(%r14)
+ lghi %r14,__LC_GPREGS_SAVE_AREA+64
+ stmg %r0,%r7,__PT_R0(%r11)
+ mvc __PT_R8(64,%r11),0(%r14)
stmg %r8,%r9,__PT_PSW(%r11)
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
lgr %r2,%r11 # pass pointer to pt_regs
--
1.8.1.2
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