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=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS 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 8B871C49ED7 for ; Mon, 23 Sep 2019 06:58:26 +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 5ED3021928 for ; Mon, 23 Sep 2019 06:58:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5ED3021928 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]:52812 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iCIIj-0007dj-0c for qemu-devel@archiver.kernel.org; Mon, 23 Sep 2019 02:58:25 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:32863) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iCIGd-0006Ca-6A for qemu-devel@nongnu.org; Mon, 23 Sep 2019 02:56:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iCIGb-0006qh-U0 for qemu-devel@nongnu.org; Mon, 23 Sep 2019 02:56:15 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39348) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iCIGX-0006nE-Rw; Mon, 23 Sep 2019 02:56:09 -0400 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 mx1.redhat.com (Postfix) with ESMTPS id 73507C049E32; Mon, 23 Sep 2019 06:56:08 +0000 (UTC) Received: from laptop.redhat.com (ovpn-116-30.ams2.redhat.com [10.36.116.30]) by smtp.corp.redhat.com (Postfix) with ESMTP id 59CD25D713; Mon, 23 Sep 2019 06:55:54 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, pbonzini@redhat.com, alex.williamson@redhat.com, peterx@redhat.com, aik@ozlabs.ru, david@gibson.dropbear.id.au Subject: [PATCH v3 0/2] Allow memory_region_register_iommu_notifier() to fail Date: Mon, 23 Sep 2019 08:55:50 +0200 Message-Id: <20190923065552.10602-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Mon, 23 Sep 2019 06:56:08 +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 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: mst@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This series allows the memory_region_register_iommu_notifier() to fail. As of now, when a MAP notifier is attempted to be registered along with SMMUv3 or AMD IOMMU, we exit in the IOMMU MR notify_flag_changed() callback. In case of VFIO assigned device hotplug, this could be handled more nicely directly within the VFIO code, simply rejecting the hotplug without exiting. This is what the series achieves by handling the memory_region_register_iommu_notifier() returned value and Error object. To propagate errors collected during vfio_listener_region_add() we now store the error handle inside the VFIO container instead of a returned value. The message now is: (QEMU) device_add id=3Dhot0 driver=3Dvfio-pci host=3D0000:89:00.0 bus=3Dp= cie.1 {"error": {"class": "GenericError", "desc": "vfio 0000:89:00.0: failed to setup container for group 2: memory listener initialization failed: Region smmuv3-iommu-memory-region-0-6: device 01.00.0 requires iommu MAP notifier which is not currently supported"}} Best Regards Eric This series can be found at: https://github.com/eauger/qemu/tree/v4.1.0_register_iommu_notifier_fail_v= 3 History: v2 -> v3: - also pass an Error handle (suggested by Peter) - VFIO container error becomes and Error handle v1 -> v2: - Intel IOMMU now handles the problem differently with machine init done notifier and machine hotplug allowed hook. - use assert(!ret) - message rewording in SMMUv3 Follow-up of "VFIO/SMMUv3: Fail on VFIO/HW nested paging detection" https://patchew.org/QEMU/20190829090141.21821-1-eric.auger@redhat.com/ Eric Auger (2): vfio: Turn the container error into an Error handle memory: allow memory_region_register_iommu_notifier() to fail exec.c | 10 ++++-- hw/arm/smmuv3.c | 18 +++++----- hw/i386/amd_iommu.c | 17 +++++---- hw/i386/intel_iommu.c | 8 +++-- hw/ppc/spapr_iommu.c | 8 +++-- hw/vfio/common.c | 67 +++++++++++++++++++++-------------- hw/vfio/spapr.c | 4 ++- hw/virtio/vhost.c | 9 +++-- include/exec/memory.h | 21 ++++++++--- include/hw/vfio/vfio-common.h | 2 +- memory.c | 31 ++++++++++------ 11 files changed, 126 insertions(+), 69 deletions(-) --=20 2.20.1