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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,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 E4C64C43603 for ; Fri, 6 Dec 2019 23:14:41 +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 AD71D20707 for ; Fri, 6 Dec 2019 23:14:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="AD/oX91n" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AD71D20707 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]:46286 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1idMo4-0006Qm-PS for qemu-devel@archiver.kernel.org; Fri, 06 Dec 2019 18:14:40 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:39798) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1idMnD-0005sa-3M for qemu-devel@nongnu.org; Fri, 06 Dec 2019 18:13:48 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1idMnA-0004ss-Dh for qemu-devel@nongnu.org; Fri, 06 Dec 2019 18:13:45 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:56801 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1idMn9-0004fp-Eu for qemu-devel@nongnu.org; Fri, 06 Dec 2019 18:13:44 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1575674022; h=from:from: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=c2liiLua+vDGh/gfnmWAijNKZrk6v9hVwlYubgc588Q=; b=AD/oX91nydqNI+O+z/3l9rl4Hvw1LrV9CdULFjYoNEHtvcd4miRAW3TjTrRKhib2dCecUC +0Z3a9Xb1B5IgaS/7ETV4yrslD6tlxWM8WP8DQsiwRhAVgrwnXZ8ogqX/G0z4zdbRaJzma hzGzv6EkKQ6GkW7sIqh7ybTqh3b40q4= 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-167-ke8FPo4OP5W046Jk9LX56w-1; Fri, 06 Dec 2019 18:13:38 -0500 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E4919107ACC7; Fri, 6 Dec 2019 23:13:36 +0000 (UTC) Received: from [10.3.116.171] (ovpn-116-171.phx2.redhat.com [10.3.116.171]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 7C3D65D6BB; Fri, 6 Dec 2019 23:13:31 +0000 (UTC) Subject: Re: [RFC PATCH 1/9] vfio/pci: introduce mediate ops to intercept vfio-pci ops To: Yan Zhao , alex.williamson@redhat.com References: <20191205032419.29606-1-yan.y.zhao@intel.com> <20191205032536.29653-1-yan.y.zhao@intel.com> From: Eric Blake Organization: Red Hat, Inc. Message-ID: <9461f821-73fd-a66f-e142-c1a55e38e7a0@redhat.com> Date: Fri, 6 Dec 2019 17:13:30 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <20191205032536.29653-1-yan.y.zhao@intel.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-MC-Unique: ke8FPo4OP5W046Jk9LX56w-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 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: kevin.tian@intel.com, kvm@vger.kernel.org, libvir-list@redhat.com, cohuck@redhat.com, linux-kernel@vger.kernel.org, zhenyuw@linux.intel.com, qemu-devel@nongnu.org, shaopeng.he@intel.com, zhi.a.wang@intel.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 12/4/19 9:25 PM, Yan Zhao wrote: > when vfio-pci is bound to a physical device, almost all the hardware > resources are passthroughed. The intent is obvious, but it sounds awkward to a native speaker. s/passthroughed/passed through/ > Sometimes, vendor driver of this physcial device may want to mediate some physical > hardware resource access for a short period of time, e.g. dirty page > tracking during live migration. > > Here we introduce mediate ops in vfio-pci for this purpose. > > Vendor driver can register a mediate ops to vfio-pci. > But rather than directly bind to the passthroughed device, the passed-through -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org