From patchwork Wed Mar 2 20:30:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 12766701 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 0B255C433EF for ; Wed, 2 Mar 2022 20:42:55 +0000 (UTC) Received: from localhost ([::1]:47868 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nPVoE-0003KG-4J for qemu-devel@archiver.kernel.org; Wed, 02 Mar 2022 15:42:54 -0500 Received: from eggs.gnu.org ([209.51.188.92]:38574) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nPVdS-0006Zw-ST for qemu-devel@nongnu.org; Wed, 02 Mar 2022 15:31:47 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:46282) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nPVdR-0002EP-2d for qemu-devel@nongnu.org; Wed, 02 Mar 2022 15:31:46 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1646253104; 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=qe3jxSXDG5DSuhKY26pYDYer2M4rplv/x0nFcnVVS58=; b=G4Zh4LYQL0Y7dam0+sO1OOgNhqKC1sbMwM+v3KpgZCIVQIVyJpKCWHgh1EVIPb9ERb9raO K9pkwWSYRQd8nB4Ajtpa9n+6179KrI+Rerbl8H9ksIhhAnsT4vd5Yma61VCMifgNlcq7Wq XPyMaF35ZFqCaN9TndyWS3TE1GweN1g= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-346-eMm0mWuBOmWeYMdRV_GYzQ-1; Wed, 02 Mar 2022 15:31:41 -0500 X-MC-Unique: eMm0mWuBOmWeYMdRV_GYzQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 71D86801AAD; Wed, 2 Mar 2022 20:31:39 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.195.142]) by smtp.corp.redhat.com (Postfix) with ESMTP id F04F645C93; Wed, 2 Mar 2022 20:31:33 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: qemu-devel@nongnu.org Subject: [PATCH v3 09/14] vhost: Add VhostIOVATree Date: Wed, 2 Mar 2022 21:30:07 +0100 Message-Id: <20220302203012.3476835-10-eperezma@redhat.com> In-Reply-To: <20220302203012.3476835-1-eperezma@redhat.com> References: <20220302203012.3476835-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eperezma@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.133.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Michael S. Tsirkin" , Jason Wang , Peter Xu , virtualization@lists.linux-foundation.org, Eli Cohen , Eric Blake , Parav Pandit , Cindy Lu , "Fangyi \(Eric\)" , Markus Armbruster , yebiaoxiang@huawei.com, Liuxiangdong , Stefano Garzarella , Laurent Vivier , Eduardo Habkost , Richard Henderson , Gautam Dawar , Xiao W Wang , Stefan Hajnoczi , Juan Quintela , Harpreet Singh Anand , Zhu Lingshan Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This tree is able to look for a translated address from an IOVA address. At first glance it is similar to util/iova-tree. However, SVQ working on devices with limited IOVA space need more capabilities, like allocating IOVA chunks or performing reverse translations (qemu addresses to iova). The allocation capability, as "assign a free IOVA address to this chunk of memory in qemu's address space" allows shadow virtqueue to create a new address space that is not restricted by guest's addressable one, so we can allocate shadow vqs vrings outside of it. It duplicates the tree so it can search efficiently in both directions, and it will signal overlap if iova or the translated address is present in any tree. Signed-off-by: Eugenio Pérez --- hw/virtio/vhost-iova-tree.h | 27 +++++++ hw/virtio/vhost-iova-tree.c | 155 ++++++++++++++++++++++++++++++++++++ hw/virtio/meson.build | 2 +- 3 files changed, 183 insertions(+), 1 deletion(-) create mode 100644 hw/virtio/vhost-iova-tree.h create mode 100644 hw/virtio/vhost-iova-tree.c diff --git a/hw/virtio/vhost-iova-tree.h b/hw/virtio/vhost-iova-tree.h new file mode 100644 index 0000000000..6a4f24e0f9 --- /dev/null +++ b/hw/virtio/vhost-iova-tree.h @@ -0,0 +1,27 @@ +/* + * vhost software live migration iova tree + * + * SPDX-FileCopyrightText: Red Hat, Inc. 2021 + * SPDX-FileContributor: Author: Eugenio Pérez + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#ifndef HW_VIRTIO_VHOST_IOVA_TREE_H +#define HW_VIRTIO_VHOST_IOVA_TREE_H + +#include "qemu/iova-tree.h" +#include "exec/memory.h" + +typedef struct VhostIOVATree VhostIOVATree; + +VhostIOVATree *vhost_iova_tree_new(uint64_t iova_first, uint64_t iova_last); +void vhost_iova_tree_delete(VhostIOVATree *iova_tree); +G_DEFINE_AUTOPTR_CLEANUP_FUNC(VhostIOVATree, vhost_iova_tree_delete); + +const DMAMap *vhost_iova_tree_find_iova(const VhostIOVATree *iova_tree, + const DMAMap *map); +int vhost_iova_tree_map_alloc(VhostIOVATree *iova_tree, DMAMap *map); +void vhost_iova_tree_remove(VhostIOVATree *iova_tree, const DMAMap *map); + +#endif diff --git a/hw/virtio/vhost-iova-tree.c b/hw/virtio/vhost-iova-tree.c new file mode 100644 index 0000000000..8fec110983 --- /dev/null +++ b/hw/virtio/vhost-iova-tree.c @@ -0,0 +1,155 @@ +/* + * vhost software live migration iova tree + * + * SPDX-FileCopyrightText: Red Hat, Inc. 2021 + * SPDX-FileContributor: Author: Eugenio Pérez + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "qemu/iova-tree.h" +#include "vhost-iova-tree.h" + +#define iova_min_addr qemu_real_host_page_size + +/** + * VhostIOVATree, able to: + * - Translate iova address + * - Reverse translate iova address (from translated to iova) + * - Allocate IOVA regions for translated range (linear operation) + */ +struct VhostIOVATree { + /* First addressable iova address in the device */ + uint64_t iova_first; + + /* Last addressable iova address in the device */ + uint64_t iova_last; + + /* IOVA address to qemu memory maps. */ + IOVATree *iova_taddr_map; + + /* QEMU virtual memory address to iova maps */ + GTree *taddr_iova_map; +}; + +static gint vhost_iova_tree_cmp_taddr(gconstpointer a, gconstpointer b, + gpointer data) +{ + const DMAMap *m1 = a, *m2 = b; + + if (m1->translated_addr > m2->translated_addr + m2->size) { + return 1; + } + + if (m1->translated_addr + m1->size < m2->translated_addr) { + return -1; + } + + /* Overlapped */ + return 0; +} + +/** + * Create a new IOVA tree + * + * Returns the new IOVA tree + */ +VhostIOVATree *vhost_iova_tree_new(hwaddr iova_first, hwaddr iova_last) +{ + VhostIOVATree *tree = g_new(VhostIOVATree, 1); + + /* Some devices do not like 0 addresses */ + tree->iova_first = MAX(iova_first, iova_min_addr); + tree->iova_last = iova_last; + + tree->iova_taddr_map = iova_tree_new(); + tree->taddr_iova_map = g_tree_new_full(vhost_iova_tree_cmp_taddr, NULL, + NULL, g_free); + return tree; +} + +/** + * Delete an iova tree + */ +void vhost_iova_tree_delete(VhostIOVATree *iova_tree) +{ + iova_tree_destroy(iova_tree->iova_taddr_map); + g_tree_unref(iova_tree->taddr_iova_map); + g_free(iova_tree); +} + +/** + * Find the IOVA address stored from a memory address + * + * @tree: The iova tree + * @map: The map with the memory address + * + * Return the stored mapping, or NULL if not found. + */ +const DMAMap *vhost_iova_tree_find_iova(const VhostIOVATree *tree, + const DMAMap *map) +{ + return g_tree_lookup(tree->taddr_iova_map, map); +} + +/** + * Allocate a new mapping + * + * @tree: The iova tree + * @map: The iova map + * + * Returns: + * - IOVA_OK if the map fits in the container + * - IOVA_ERR_INVALID if the map does not make sense (like size overflow) + * - IOVA_ERR_OVERLAP if the tree already contains that map + * - IOVA_ERR_NOMEM if tree cannot allocate more space. + * + * It returns assignated iova in map->iova if return value is VHOST_DMA_MAP_OK. + */ +int vhost_iova_tree_map_alloc(VhostIOVATree *tree, DMAMap *map) +{ + /* Some vhost devices do not like addr 0. Skip first page */ + hwaddr iova_first = tree->iova_first ?: qemu_real_host_page_size; + DMAMap *new; + int r; + + if (map->translated_addr + map->size < map->translated_addr || + map->perm == IOMMU_NONE) { + return IOVA_ERR_INVALID; + } + + /* Check for collisions in translated addresses */ + if (vhost_iova_tree_find_iova(tree, map)) { + return IOVA_ERR_OVERLAP; + } + + /* Allocate a node in IOVA address */ + r = iova_tree_alloc_map(tree->iova_taddr_map, map, iova_first, + tree->iova_last); + if (r != IOVA_OK) { + return r; + } + + /* Allocate node in qemu -> iova translations */ + new = g_malloc(sizeof(*new)); + memcpy(new, map, sizeof(*new)); + g_tree_insert(tree->taddr_iova_map, new, new); + return IOVA_OK; +} + +/** + * Remove existing mappings from iova tree + * + * @iova_tree: The vhost iova tree + * @map: The map to remove + */ +void vhost_iova_tree_remove(VhostIOVATree *iova_tree, const DMAMap *map) +{ + const DMAMap *overlap; + + iova_tree_remove(iova_tree->iova_taddr_map, map); + while ((overlap = vhost_iova_tree_find_iova(iova_tree, map))) { + g_tree_remove(iova_tree->taddr_iova_map, overlap); + } +} diff --git a/hw/virtio/meson.build b/hw/virtio/meson.build index 2dc87613bc..6047670804 100644 --- a/hw/virtio/meson.build +++ b/hw/virtio/meson.build @@ -11,7 +11,7 @@ softmmu_ss.add(when: 'CONFIG_ALL', if_true: files('vhost-stub.c')) virtio_ss = ss.source_set() virtio_ss.add(files('virtio.c')) -virtio_ss.add(when: 'CONFIG_VHOST', if_true: files('vhost.c', 'vhost-backend.c', 'vhost-shadow-virtqueue.c')) +virtio_ss.add(when: 'CONFIG_VHOST', if_true: files('vhost.c', 'vhost-backend.c', 'vhost-shadow-virtqueue.c', 'vhost-iova-tree.c')) virtio_ss.add(when: 'CONFIG_VHOST_USER', if_true: files('vhost-user.c')) virtio_ss.add(when: 'CONFIG_VHOST_VDPA', if_true: files('vhost-vdpa.c')) virtio_ss.add(when: 'CONFIG_VIRTIO_BALLOON', if_true: files('virtio-balloon.c'))