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%3Ba=su...
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@vger.kernel.org know about it.
From foo@baz Mon Dec 18 13:28:59 CET 2017
From: Breno Leitao leitao@debian.org Date: Tue, 17 Oct 2017 16:20:18 -0200 Subject: powerpc/xmon: Check before calling xive functions
From: Breno Leitao leitao@debian.org
[ 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@linux.vnet.ibm.com Signed-off-by: Breno Leitao leitao@debian.org Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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@debian.org are
queue-4.14/powerpc-xmon-check-before-calling-xive-functions.patch