This is a note to let you know that I've just added the patch titled
powerpc/xmon: Check before calling xive functions
to the 4.14-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:
powerpc-xmon-check-before-calling-xive-functions.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Dec 18 13:28:59 CET 2017
From: Breno Leitao <leitao@xxxxxxxxxx>
Date: Tue, 17 Oct 2017 16:20:18 -0200
Subject: powerpc/xmon: Check before calling xive functions
From: Breno Leitao <leitao@xxxxxxxxxx>
[ Upstream commit 402e172a2ce76210f2fe921cf419d12103851344 ]
Currently xmon could call XIVE functions from OPAL even if the XIVE is
disabled or does not exist in the system, as in POWER8 machines. This
causes the following exception:
1:mon> dx
cpu 0x1: Vector: 700 (Program Check) at [c000000423c93450]
pc: c00000000009cfa4: opal_xive_dump+0x50/0x68
lr: c0000000000997b8: opal_return+0x0/0x50
This patch simply checks if XIVE is enabled before calling XIVE
functions.
Fixes: 243e25112d06 ("powerpc/xive: Native exploitation of the XIVE interrupt controller")
Suggested-by: Guilherme G. Piccoli <gpiccoli@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/xmon/xmon.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -2475,6 +2475,11 @@ static void dump_xives(void)
unsigned long num;
int c;
+ if (!xive_enabled()) {
+ printf("Xive disabled on this system\n");
+ return;
+ }
+
c = inchar();
if (c == 'a') {
dump_all_xives();
Patches currently in stable-queue which might be from leitao@xxxxxxxxxx are
queue-4.14/powerpc-xmon-check-before-calling-xive-functions.patch