From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7CC81C43331 for ; Wed, 1 Apr 2020 12:53:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 59D7520675 for ; Wed, 1 Apr 2020 12:53:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732635AbgDAMx0 (ORCPT ); Wed, 1 Apr 2020 08:53:26 -0400 Received: from ozlabs.org ([203.11.71.1]:33375 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732579AbgDAMxZ (ORCPT ); Wed, 1 Apr 2020 08:53:25 -0400 Received: by ozlabs.org (Postfix, from userid 1034) id 48smMl3sfDz9sTT; Wed, 1 Apr 2020 23:53:22 +1100 (AEDT) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: b1a504a6500df50e83b701b7946b34fce27ad8a3 In-Reply-To: <20200306150143.5551-2-clg@kaod.org> To: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= From: Michael Ellerman Cc: David Gibson , linuxppc-dev@lists.ozlabs.org, Greg Kurz , stable@vger.kernel.org, =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: Re: [PATCH 1/4] powerpc/xive: Use XIVE_BAD_IRQ instead of zero to catch non configured IPIs Message-Id: <48smMl3sfDz9sTT@ozlabs.org> Date: Wed, 1 Apr 2020 23:53:22 +1100 (AEDT) Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Fri, 2020-03-06 at 15:01:40 UTC, =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= wrote: > When a CPU is brought up, an IPI number is allocated and recorded > under the XIVE CPU structure. Invalid IPI numbers are tracked with > interrupt number 0x0. > > On the PowerNV platform, the interrupt number space starts at 0x10 and > this works fine. However, on the sPAPR platform, it is possible to > allocate the interrupt number 0x0 and this raises an issue when CPU 0 > is unplugged. The XIVE spapr driver tracks allocated interrupt numbers > in a bitmask and it is not correctly updated when interrupt number 0x0 > is freed. It stays allocated and it is then impossible to reallocate. > > Fix by using the XIVE_BAD_IRQ value instead of zero on both platforms. > > Reported-by: David Gibson > Fixes: eac1e731b59e ("powerpc/xive: guest exploitation of the XIVE interrupt controller") > Cc: stable@vger.kernel.org # v4.14+ > Signed-off-by: Cédric Le Goater Series applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/b1a504a6500df50e83b701b7946b34fce27ad8a3 cheers