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=-5.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 9013DC35280 for ; Wed, 2 Oct 2019 04:36:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6AC6F20842 for ; Wed, 2 Oct 2019 04:36:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726975AbfJBEge (ORCPT ); Wed, 2 Oct 2019 00:36:34 -0400 Received: from mx2.suse.de ([195.135.220.15]:35008 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725991AbfJBEge (ORCPT ); Wed, 2 Oct 2019 00:36:34 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id EA59AAF56; Wed, 2 Oct 2019 04:36:32 +0000 (UTC) Subject: Re: [PATCH] x86/xen: Return from panic notifier To: Boris Ostrovsky , xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org Cc: james@dingwall.me.uk References: <20191001151633.1659-1-boris.ostrovsky@oracle.com> From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Message-ID: <3fb02346-16b8-1885-32b3-8d136ad7118b@suse.com> Date: Wed, 2 Oct 2019 06:36:31 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20191001151633.1659-1-boris.ostrovsky@oracle.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01.10.19 17:16, Boris Ostrovsky wrote: > Currently execution of panic() continues until Xen's panic notifier > (xen_panic_event()) is called at which point we make a hypercall that > never returns. > > This means that any notifier that is supposed to be called later as > well as significant part of panic() code (such as pstore writes from > kmsg_dump()) is never executed. > > There is no reason for xen_panic_event() to be this last point in > execution since panic()'s emergency_restart() will call into > xen_emergency_restart() from where we can perform our hypercall. > > Reported-by: James Dingwall > Signed-off-by: Boris Ostrovsky Reviewed-by: Juergen Gross Juergen