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=-7.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_2 autolearn=unavailable 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 72951C432C0 for ; Sat, 23 Nov 2019 00:01:10 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (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 3CC4520714 for ; Sat, 23 Nov 2019 00:01:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3CC4520714 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 0F98E88364; Sat, 23 Nov 2019 00:01:10 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wtw4zSTv3zR8; Sat, 23 Nov 2019 00:01:08 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id 9EFC78835B; Sat, 23 Nov 2019 00:01:08 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 6CA78C1DD8; Sat, 23 Nov 2019 00:01:08 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 316C1C18DA; Sat, 23 Nov 2019 00:01:06 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 278D6874AF; Sat, 23 Nov 2019 00:01:06 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GbVwuxHy_0BV; Sat, 23 Nov 2019 00:01:05 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by fraxinus.osuosl.org (Postfix) with ESMTPS id 2F41087516; Sat, 23 Nov 2019 00:01:05 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 Nov 2019 16:01:04 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,231,1571727600"; d="scan'208";a="290792434" Received: from jpan9-mobl2.amr.corp.intel.com (HELO localhost) ([10.254.71.164]) by orsmga001.jf.intel.com with ESMTP; 22 Nov 2019 16:01:03 -0800 Date: Fri, 22 Nov 2019 16:01:02 -0800 From: "Jacob Pan (Jun)" To: Jean-Philippe Brucker Subject: Re: [RFC 00/13] virtio-iommu on non-devicetree platforms Message-ID: <20191122160102.00004489@intel.com> In-Reply-To: <20191122105000.800410-1-jean-philippe@linaro.org> References: <20191122105000.800410-1-jean-philippe@linaro.org> Organization: intel X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; i686-w64-mingw32) MIME-Version: 1.0 Cc: virtio-dev@lists.oasis-open.org, kevin.tian@intel.com, gregkh@linuxfoundation.org, linux-pci@vger.kernel.org, sudeep.holla@arm.com, rjw@rjwysocki.net, virtualization@lists.linux-foundation.org, linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org, sebastien.boeuf@intel.com, mst@redhat.com, jacob.jun.pan@intel.com, guohanjun@huawei.com, bhelgaas@google.com, jasowang@redhat.com, linux-arm-kernel@lists.infradead.org, lenb@kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Fri, 22 Nov 2019 11:49:47 +0100 Jean-Philippe Brucker wrote: > I'm seeking feedback on multi-platform support for virtio-iommu. At > the moment only devicetree (DT) is supported and we don't have a > pleasant solution for other platforms. Once we figure out the topology > description, x86 support is trivial. > > Since the IOMMU manages memory accesses from other devices, the guest > kernel needs to initialize the IOMMU before endpoints start issuing > DMA. It's a solved problem: firmware or hypervisor describes through > DT or ACPI tables the device dependencies, and probe of endpoints is > deferred until the IOMMU is probed. But: > > (1) ACPI has one table per vendor (DMAR for Intel, IVRS for AMD and > IORT for Arm). From my point of view IORT is easier to extend, since > we just need to introduce a new node type. There are no dependencies > to Arm in the Linux IORT driver, so it works well with CONFIG_X86. > >From my limited understanding, IORT and VIOT is to solve device topology enumeration only? I am not sure how it can be expanded to cover information beyond device topology. e.g. DMAR has NUMA information and root port ATS, I guess they are not used today in the guest but might be additions in the future. > However, there are concerns about other OS vendors feeling > obligated to implement this new node, so Arm proposed introducing > another ACPI table, that can wrap any of DMAR, IVRS and IORT to > extend it with new virtual nodes. A draft of this VIOT table > specification is available at > http://jpbrucker.net/virtio-iommu/viot/viot-v5.pdf > > I'm afraid this could increase fragmentation as guests would need > to implement or modify their support for all of DMAR, IVRS and IORT. > If we end up doing VIOT, I suggest limiting it to IORT. > > (2) In addition, there are some concerns about having virtio depend on > ACPI or DT. Some hypervisors (Firecracker, QEMU microvm, kvmtool > x86 [1]) don't currently implement those methods. > > It was suggested to embed the topology description into the > device. It can work, as demonstrated at the end of this RFC, with the > following limitations: > > - The topology description must be read before any endpoint > managed by the IOMMU is probed, and even before the virtio module is > loaded. This RFC uses a PCI quirk to manually parse the virtio > configuration. It assumes that all endpoints managed by the > IOMMU are under this same PCI host. > > - I don't have a solution for the virtio-mmio transport at the > moment, because I haven't had time to modify a host to test it. > I think it could either use a notifier on the platform bus, or > better, a new 'iommu' command-line argument to the virtio-mmio > driver. So the current prototype doesn't work for firecracker > and microvm, which rely on virtio-mmio. > > - For Arm, if the platform has an ITS, the hypervisor needs IORT > or DT to describe it anyway. More generally, not using either ACPI or > DT might prevent from supporting other features as well. I > suspect the above users will have to implement a standard method > sooner or later. > > - Even when reusing as much existing code as possible, guest > support is still going to be around a few hundred lines since we can't > rely on the normal virtio infrastructure to be loaded at that > point. As you can see below, the diffstat for the incomplete > topology implementation is already bigger than the exhaustive > IORT support, even when jumping through the VIOT hoop. > > So it's a lightweight solution for very specific use-cases, and we > should still support ACPI for the general case. Multi-platform > guests such as Linux will then need to support three topology > descriptions instead of two. > > In this RFC I present both solutions, but I'd rather not keep all of > it. Please see the individual patches for details: > > (1) Patches 1, 3-10 add support for virtio-iommu to the Linux IORT > driver and patches 2, 11 add the VIOT glue. > > (2) Patch 12 adds the built-in topology description to the > virtio-iommu specification. Patch 13 is a partial implementation for > the Linux virtio-iommu driver. It only supports PCI, not platform > devices. > > You can find Linux and QEMU code on my virtio-iommu/devel branches at > http://jpbrucker.net/git/linux and http://jpbrucker.net/git/qemu > > > I split the diffstat since there are two independent features. The > first one is for patches 1-11, and the second one for patch 13. > > Jean-Philippe Brucker (11): > ACPI/IORT: Move IORT to the ACPI folder > ACPI: Add VIOT definitions > ACPI/IORT: Allow registration of external tables > ACPI/IORT: Add node categories > ACPI/IORT: Support VIOT virtio-mmio node > ACPI/IORT: Support VIOT virtio-pci node > ACPI/IORT: Defer probe until virtio-iommu-pci has registered a > fwnode ACPI/IORT: Add callback to update a device's fwnode > iommu/virtio: Create fwnode if necessary > iommu/virtio: Update IORT fwnode > ACPI: Add VIOT table > > MAINTAINERS | 9 + > drivers/acpi/Kconfig | 7 + > drivers/acpi/Makefile | 2 + > drivers/acpi/arm64/Kconfig | 3 - > drivers/acpi/arm64/Makefile | 1 - > drivers/acpi/bus.c | 2 + > drivers/acpi/{arm64 => }/iort.c | 317 > ++++++++++++++++++++++++++------ drivers/acpi/tables.c | > 2 +- drivers/acpi/viot.c | 44 +++++ > drivers/iommu/Kconfig | 1 + > drivers/iommu/virtio-iommu.c | 61 +++++- > include/acpi/actbl2.h | 31 ++++ > include/linux/acpi_iort.h | 14 ++ > include/linux/acpi_viot.h | 20 ++ > 14 files changed, 448 insertions(+), 66 deletions(-) > rename drivers/acpi/{arm64 => }/iort.c (86%) > create mode 100644 drivers/acpi/viot.c > create mode 100644 include/linux/acpi_viot.h > > Jean-Philippe Brucker (1): > iommu/virtio: Add topology description to virtio-iommu config space > > drivers/base/platform.c | 3 + > drivers/iommu/Kconfig | 9 + > drivers/iommu/Makefile | 1 + > drivers/iommu/virtio-iommu-topology.c | 410 > ++++++++++++++++++++++++++ drivers/iommu/virtio-iommu.c | > 3 + drivers/pci/pci-driver.c | 3 + > include/linux/virtio_iommu.h | 18 ++ > include/uapi/linux/virtio_iommu.h | 26 ++ > 8 files changed, 473 insertions(+) > create mode 100644 drivers/iommu/virtio-iommu-topology.c > create mode 100644 include/linux/virtio_iommu.h > > > [1] firecracker: https://github.com/firecracker-microvm/firecracker > microvm: https://github.com/qemu/qemu/blob/master/docs/microvm.rst > kvmtool: > https://git.kernel.org/pub/scm/linux/kernel/git/will/kvmtool.git/ _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu