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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 EA483C0650E for ; Thu, 4 Jul 2019 08:18:56 +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 BF971218A3 for ; Thu, 4 Jul 2019 08:18:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BF971218A3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:43472 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hiwxE-0000mS-0X for qemu-devel@archiver.kernel.org; Thu, 04 Jul 2019 04:18:56 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52961) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hiwwR-0000Kw-N5 for qemu-devel@nongnu.org; Thu, 04 Jul 2019 04:18:08 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hiwwQ-0005No-FE for qemu-devel@nongnu.org; Thu, 04 Jul 2019 04:18:07 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49748) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hiwwQ-0005J1-A9 for qemu-devel@nongnu.org; Thu, 04 Jul 2019 04:18:06 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C8C063086211; Thu, 4 Jul 2019 08:17:57 +0000 (UTC) Received: from xz-x1 (unknown [10.66.61.6]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 197214DA30; Thu, 4 Jul 2019 08:17:50 +0000 (UTC) Date: Thu, 4 Jul 2019 16:17:48 +0800 From: Peter Xu To: Jason Wang Message-ID: <20190704081748.GF3796@xz-x1> References: <20190624091811.30412-1-peterx@redhat.com> <20190624091811.30412-3-peterx@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.11.4 (2019-03-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Thu, 04 Jul 2019 08:17:59 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH v2 2/2] intel_iommu: Fix unexpected unmaps during global unmap 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: , Cc: Paolo Bonzini , Yan Zhao , qemu-devel@nongnu.org, Auger Eric , "Michael S . Tsirkin" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, Jul 04, 2019 at 01:45:41PM +0800, Jason Wang wrote: >=20 > On 2019/6/24 =E4=B8=8B=E5=8D=885:18, Peter Xu wrote: > > This is an replacement work of Yan Zhao's patch: > >=20 > > https://www.mail-archive.com/qemu-devel@nongnu.org/msg625340.html > >=20 > > vtd_address_space_unmap() will do proper page mask alignment to make > > sure each IOTLB message will have correct masks for notification > > messages (2^N-1), but sometimes it can be expanded to even supercede > > the registered range. >=20 >=20 > I wonder under what circumstance that could we meet this? Sorry I forgot to reply-all just now... I've asked a similar question, and Yan's answer is here: https://www.mail-archive.com/qemu-devel@nongnu.org/msg625597.html Regards, --=20 Peter Xu