This is a note to let you know that I've just added the patch titled
[S390] kvm-390: Let kernel exit SIE instruction on work
to the 2.6.38-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:
kvm-390-let-kernel-exit-sie-instruction-on-work.patch
and it can be found in the queue-2.6.38 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 9ff4cfb3fcfd48b49fdd9be7381b3be340853aa4 Mon Sep 17 00:00:00 2001
From: Carsten Otte <[email protected]>
Date: Wed, 20 Apr 2011 10:15:36 +0200
Subject: [S390] kvm-390: Let kernel exit SIE instruction on work
From: Carsten Otte <[email protected]>
commit 9ff4cfb3fcfd48b49fdd9be7381b3be340853aa4 upstream.
From: Christian Borntraeger <[email protected]>
This patch fixes the sie exit on interrupts. The low level
interrupt handler returns to the PSW address in pt_regs and not
to the PSW address in the lowcore.
Without this fix a cpu bound guest might never leave guest state
since the host interrupt handler would blindly return to the
SIE instruction, even on need_resched and friends.
Signed-off-by: Carsten Otte <[email protected]>
Signed-off-by: Christian Borntraeger <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/s390/kvm/sie64a.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/s390/kvm/sie64a.S
+++ b/arch/s390/kvm/sie64a.S
@@ -48,10 +48,10 @@ sie_irq_handler:
tm __TI_flags+7(%r2),_TIF_EXIT_SIE
jz 0f
larl %r2,sie_exit # work pending, leave sie
- stg %r2,__LC_RETURN_PSW+8
+ stg %r2,SPI_PSW+8(0,%r15)
br %r14
0: larl %r2,sie_reenter # re-enter with guest id
- stg %r2,__LC_RETURN_PSW+8
+ stg %r2,SPI_PSW+8(0,%r15)
1: br %r14
/*
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.38/kvm-390-let-kernel-exit-sie-instruction-on-work.patch
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