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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 B2876C433DB for ; Fri, 19 Feb 2021 09:48:34 +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 1E49064D5D for ; Fri, 19 Feb 2021 09:48:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1E49064D5D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:36470 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lD2Om-0004xs-Rf for qemu-devel@archiver.kernel.org; Fri, 19 Feb 2021 04:48:32 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:44652) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lD2KQ-0000vE-Ra; Fri, 19 Feb 2021 04:44:03 -0500 Received: from szxga05-in.huawei.com ([45.249.212.191]:3482) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lD2K8-0006XQ-Tp; Fri, 19 Feb 2021 04:44:02 -0500 Received: from DGGEMS405-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4DhmnC5HLCzjPyN; Fri, 19 Feb 2021 17:41:51 +0800 (CST) Received: from DESKTOP-6NKE0BC.china.huawei.com (10.174.185.210) by DGGEMS405-HUB.china.huawei.com (10.3.19.205) with Microsoft SMTP Server id 14.3.498.0; Fri, 19 Feb 2021 17:43:13 +0800 From: Kunkun Jiang To: Eric Auger , Peter Maydell , Alex Williamson , "open list:ARM SMMU" , "open list:All patches CC here" Subject: [RFC PATCH 0/3] Add migration support for VFIO PCI devices in SMMUv3 nested stage mode Date: Fri, 19 Feb 2021 17:42:27 +0800 Message-ID: <20210219094230.231-1-jiangkunkun@huawei.com> X-Mailer: git-send-email 2.26.2.windows.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.174.185.210] X-CFilter-Loop: Reflected Received-SPF: pass client-ip=45.249.212.191; envelope-from=jiangkunkun@huawei.com; helo=szxga05-in.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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: , Cc: Zenghui Yu , wanghaibin.wang@huawei.com, Keqian Zhu , shameerali.kolothum.thodi@huawei.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi all, Since the SMMUv3's nested translation stages[1] has been introduced by Eric, we need to pay attention to the migration of VFIO PCI devices in SMMUv3 nested stage mode. At present, it is not yet supported in QEMU. There are two problems in the existing framework. First, the current way to get dirty pages is not applicable to nested stage mode. Because of the "Caching Mode", VTD can map the RAM through the host single stage (giova->hpa). "vfio_listener_log_sync" gets dirty pages by transferring "giova" to the kernel for the RAM block section of mapped MMIO region. In nested stage mode, we setup the stage 2 (gpa->hpa) and the stage 1(giova->gpa) separately. So it is inapplicable to get dirty pages by the current way in nested stage mode. Second, it also need to pass stage 1 configurations to the destination host after the migration. In Eric's patch, it passes the stage 1 configuration to the host on each STE update for the devices set the PASID PciOps. The configuration will be applied at physical level. But the data of physical level will not be sent to the destination host. So we have to pass stage 1 configurations to the destination host after the migration. This Patch set includes patches as below: Patch 1-2: - Refactor the vfio_listener_log_sync and added a new function to get dirty pages in nested stage mode. Patch 3: - Added the post_load function to vmstate_smmuv3 for passing stage 1 configuration to the destination host after the migration. @Eric, Could you please add this Patch set to your future version of "vSMMUv3/pSMMUv3 2 stage VFIO integration", if you think this Patch set makes sense? :) Best Regards Kunkun Jiang [1] [RFC,v7,00/26] vSMMUv3/pSMMUv3 2 stage VFIO integration http://patchwork.ozlabs.org/project/qemu-devel/cover/20201116181349.11908-1-eric.auger@redhat.com/ Kunkun Jiang (3): vfio: Introduce helpers to mark dirty pages of a RAM section vfio: Add vfio_prereg_listener_log_sync in nested stage hw/arm/smmuv3: Post-load stage 1 configurations to the host hw/arm/smmuv3.c | 60 +++++++++++++++++++++++++++++++++++++++++++++ hw/arm/trace-events | 1 + hw/vfio/common.c | 47 +++++++++++++++++++++++++++++------ 3 files changed, 100 insertions(+), 8 deletions(-) -- 2.23.0