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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 735F9C433F5 for ; Tue, 28 Sep 2021 17:02:08 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0450E60F6B for ; Tue, 28 Sep 2021 17:02:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 0450E60F6B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:36684 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mVGUY-0003ZC-VH for qemu-devel@archiver.kernel.org; Tue, 28 Sep 2021 13:02:06 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43696) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mVGTY-0002sP-Dj for qemu-devel@nongnu.org; Tue, 28 Sep 2021 13:01:04 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:33820) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mVGTW-0001yv-Nk for qemu-devel@nongnu.org; Tue, 28 Sep 2021 13:01:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1632848462; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tinLxczNR91Xlr/32tL5UyyhLGSqkE2+F/buIFw5pXQ=; b=ah2zMHSDKgq1CVToi+7kMZIPGrCBP4xRbBJXQjCyjdzjEJMTch4NGHrmHpB5sWsj96vHDi YyJ1imhqqiT20mNRcU9BX27YU+ey3+OAObWeIh3gBNez/DiC+waK/TS32DYIOm8DdN6BR7 vV8FO1SEF8FHWtBFGCLs4SFKN/Qv2DI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-474-YxcHKk5DOD2kMtun9W5b_Q-1; Tue, 28 Sep 2021 13:01:00 -0400 X-MC-Unique: YxcHKk5DOD2kMtun9W5b_Q-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 75BC0824FA6; Tue, 28 Sep 2021 17:00:59 +0000 (UTC) Received: from redhat.com (unknown [10.39.192.82]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5473D109B6E6; Tue, 28 Sep 2021 16:59:56 +0000 (UTC) Date: Tue, 28 Sep 2021 17:59:54 +0100 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: David Hildenbrand Subject: Re: [PATCH v3 7/7] util/oslib-posix: Forward SIGBUS to MCE handler under Linux Message-ID: References: <20210816094739.21970-1-david@redhat.com> <20210816094739.21970-8-david@redhat.com> MIME-Version: 1.0 In-Reply-To: <20210816094739.21970-8-david@redhat.com> User-Agent: Mutt/2.0.7 (2021-05-04) X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Cc: Pankaj Gupta , Eduardo Habkost , "Michael S. Tsirkin" , "Dr . David Alan Gilbert" , qemu-devel@nongnu.org, Igor Mammedov , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, Aug 16, 2021 at 11:47:39AM +0200, David Hildenbrand wrote: > Temporarily modifying the SIGBUS handler is really nasty, as we might be > unlucky and receive an MCE SIGBUS while having our handler registered. > Unfortunately, there is no way around messing with SIGBUS when > MADV_POPULATE_WRITE is not applicable or not around. > > Let's forward SIGBUS that don't belong to us to the already registered > handler and document the situation. > > Signed-off-by: David Hildenbrand > --- > softmmu/cpus.c | 4 ++++ > util/oslib-posix.c | 36 +++++++++++++++++++++++++++++++++--- > 2 files changed, 37 insertions(+), 3 deletions(-) Reviewed-by: Daniel P. Berrangé Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|