From patchwork Wed Aug 18 12:06:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444233 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 100FBC43214 for ; Wed, 18 Aug 2021 12:09:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EE3F86103A for ; Wed, 18 Aug 2021 12:09:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236505AbhHRMJs (ORCPT ); Wed, 18 Aug 2021 08:09:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45500 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236662AbhHRMJO (ORCPT ); Wed, 18 Aug 2021 08:09:14 -0400 Received: from mail-pj1-x102b.google.com (mail-pj1-x102b.google.com [IPv6:2607:f8b0:4864:20::102b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1C357C061140 for ; Wed, 18 Aug 2021 05:08:20 -0700 (PDT) Received: by mail-pj1-x102b.google.com with SMTP id hv22-20020a17090ae416b0290178c579e424so2171097pjb.3 for ; Wed, 18 Aug 2021 05:08:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=cPNfcFIpppIJIi7O3gQNSt8GEVrOf5XJ2otTRQ3bFV0=; b=Zj5XQxmPbhLUVuPzn2yPj94HesyBs0HLySQHJdwbIGfZmfpxLD67HqpMYIC++1B1T3 qvf6Itpw7a7GGGIDFUV8BpK1E9GJrz/q6AxjI0l3sIWRBzFQ6hOlafeWG65Prvxd4n4+ IycnKyAsnjTrhs3Tc4x2dhQ3QDStd6eOOSCcjPJeRR9uLpYs86tR2JzQBOtpTrpNEemq 3MuFF+hmdjTsdkFhPIHR9FCiRleOZlqs9/brA360qV1L3l8ju/OOD0166NQ092eZWUrV 62jnjYGQkeqEIOjp1FNQmChHQXVlLnjov7vLwZSxhxzcmO0cGfxgkG+WBLYHB/Nj4AfU Yllw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=cPNfcFIpppIJIi7O3gQNSt8GEVrOf5XJ2otTRQ3bFV0=; b=sdTtXa/ggAzNIPhnPczh6vb1mnr/PF7Z8UBIYZkKP5YphWwWdut+GwpfI48F9p9v/R 2qEieidxGIJn4rQonz56KcZEAo/ZaAMNg6/I5PT9EkNLDaY4aX4QAz75GUm00AXb8cYh HY7Tli2R54IkGHk73MrEkD5KitiLv8KBvcZHButFLVzVzQ4B9Bh3Lfa7zK90MtRT3P/W hfduP+JnQXZWHhaeaa3txdH9C0Tsrg1erKQF809ZqIsvSlsnN+VNedRLcNhZvJ7pE6+r MsIyqnDO/6r+cvtX+7lX5bSiWtB6ZRNhUX/yakVSfDJbC8zjNuLTfxPT+i+gmfue+WiY iFQQ== X-Gm-Message-State: AOAM531Ok2dB0gDtZi6sPV8cbrvqENaNd+vnT0p2XLVXT90Spbp8IO/6 3FEQZXqnsg4Wo7CtqgDtx053 X-Google-Smtp-Source: ABdhPJx4i27teW0Qz0Gxt8ttsRr56ZWVv5AyKk6ikfeATKEJfocvjmXiyP/B10ZO9r+yH6XBGWMX2Q== X-Received: by 2002:a17:90b:38c4:: with SMTP id nn4mr9175010pjb.67.1629288499641; Wed, 18 Aug 2021 05:08:19 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id b13sm6637806pfr.72.2021.08.18.05.08.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:08:19 -0700 (PDT) From: Xie Yongji To: mst@redhat.com, jasowang@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, parav@nvidia.com, hch@infradead.org, christian.brauner@canonical.com, rdunlap@infradead.org, willy@infradead.org, viro@zeniv.linux.org.uk, axboe@kernel.dk, bcrl@kvack.org, corbet@lwn.net, mika.penttila@nextfour.com, dan.carpenter@oracle.com, joro@8bytes.org, gregkh@linuxfoundation.org, zhe.he@windriver.com, xiaodong.liu@intel.com, joe@perches.com, robin.murphy@arm.com Cc: songmuchun@bytedance.com, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: [PATCH v11 09/12] vdpa: Support transferring virtual addressing during DMA mapping Date: Wed, 18 Aug 2021 20:06:39 +0800 Message-Id: <20210818120642.165-10-xieyongji@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210818120642.165-1-xieyongji@bytedance.com> References: <20210818120642.165-1-xieyongji@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch introduces an attribute for vDPA device to indicate whether virtual address can be used. If vDPA device driver set it, vhost-vdpa bus driver will not pin user page and transfer userspace virtual address instead of physical address during DMA mapping. And corresponding vma->vm_file and offset will be also passed as an opaque pointer. Suggested-by: Jason Wang Signed-off-by: Xie Yongji Acked-by: Jason Wang --- drivers/vdpa/ifcvf/ifcvf_main.c | 2 +- drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +- drivers/vdpa/vdpa.c | 9 +++- drivers/vdpa/vdpa_sim/vdpa_sim.c | 2 +- drivers/vdpa/virtio_pci/vp_vdpa.c | 2 +- drivers/vhost/vdpa.c | 99 ++++++++++++++++++++++++++++++++++----- include/linux/vdpa.h | 20 ++++++-- 7 files changed, 117 insertions(+), 19 deletions(-) diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c index ef10404e9deb..ff434070be94 100644 --- a/drivers/vdpa/ifcvf/ifcvf_main.c +++ b/drivers/vdpa/ifcvf/ifcvf_main.c @@ -492,7 +492,7 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id) } adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa, - dev, &ifc_vdpa_ops, NULL); + dev, &ifc_vdpa_ops, NULL, false); if (IS_ERR(adapter)) { IFCVF_ERR(pdev, "Failed to allocate vDPA structure"); return PTR_ERR(adapter); diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c index b60c398a8d86..5ccc430906a0 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -2040,7 +2040,7 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name) max_vqs = min_t(u32, max_vqs, MLX5_MAX_SUPPORTED_VQS); ndev = vdpa_alloc_device(struct mlx5_vdpa_net, mvdev.vdev, mdev->device, &mlx5_vdpa_ops, - name); + name, false); if (IS_ERR(ndev)) return PTR_ERR(ndev); diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index d77d59811389..41377df674d5 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -71,6 +71,7 @@ static void vdpa_release_dev(struct device *d) * @config: the bus operations that is supported by this device * @size: size of the parent structure that contains private data * @name: name of the vdpa device; optional. + * @use_va: indicate whether virtual address must be used by this device * * Driver should use vdpa_alloc_device() wrapper macro instead of * using this directly. @@ -80,7 +81,8 @@ static void vdpa_release_dev(struct device *d) */ struct vdpa_device *__vdpa_alloc_device(struct device *parent, const struct vdpa_config_ops *config, - size_t size, const char *name) + size_t size, const char *name, + bool use_va) { struct vdpa_device *vdev; int err = -EINVAL; @@ -91,6 +93,10 @@ struct vdpa_device *__vdpa_alloc_device(struct device *parent, if (!!config->dma_map != !!config->dma_unmap) goto err; + /* It should only work for the device that use on-chip IOMMU */ + if (use_va && !(config->dma_map || config->set_map)) + goto err; + err = -ENOMEM; vdev = kzalloc(size, GFP_KERNEL); if (!vdev) @@ -106,6 +112,7 @@ struct vdpa_device *__vdpa_alloc_device(struct device *parent, vdev->index = err; vdev->config = config; vdev->features_valid = false; + vdev->use_va = use_va; if (name) err = dev_set_name(&vdev->dev, "%s", name); diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c index 827d613c4eb6..37070c3ec396 100644 --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c @@ -250,7 +250,7 @@ struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr) ops = &vdpasim_config_ops; vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops, - dev_attr->name); + dev_attr->name, false); if (IS_ERR(vdpasim)) { ret = PTR_ERR(vdpasim); goto err_alloc; diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c index aec14f8c20fc..ff8d54606ea8 100644 --- a/drivers/vdpa/virtio_pci/vp_vdpa.c +++ b/drivers/vdpa/virtio_pci/vp_vdpa.c @@ -435,7 +435,7 @@ static int vp_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id) return ret; vp_vdpa = vdpa_alloc_device(struct vp_vdpa, vdpa, - dev, &vp_vdpa_ops, NULL); + dev, &vp_vdpa_ops, NULL, false); if (IS_ERR(vp_vdpa)) { dev_err(dev, "vp_vdpa: Failed to allocate vDPA structure\n"); return PTR_ERR(vp_vdpa); diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 80c7dd168b57..cd56de828ac3 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -529,8 +529,28 @@ static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, u64 start, u64 last) } } +static void vhost_vdpa_va_unmap(struct vhost_vdpa *v, u64 start, u64 last) +{ + struct vhost_dev *dev = &v->vdev; + struct vhost_iotlb *iotlb = dev->iotlb; + struct vhost_iotlb_map *map; + struct vdpa_map_file *map_file; + + while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) { + map_file = (struct vdpa_map_file *)map->opaque; + fput(map_file->file); + kfree(map_file); + vhost_iotlb_map_free(iotlb, map); + } +} + static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, u64 start, u64 last) { + struct vdpa_device *vdpa = v->vdpa; + + if (vdpa->use_va) + return vhost_vdpa_va_unmap(v, start, last); + return vhost_vdpa_pa_unmap(v, start, last); } @@ -565,21 +585,21 @@ static int perm_to_iommu_flags(u32 perm) return flags | IOMMU_CACHE; } -static int vhost_vdpa_map(struct vhost_vdpa *v, - u64 iova, u64 size, u64 pa, u32 perm) +static int vhost_vdpa_map(struct vhost_vdpa *v, u64 iova, + u64 size, u64 pa, u32 perm, void *opaque) { struct vhost_dev *dev = &v->vdev; struct vdpa_device *vdpa = v->vdpa; const struct vdpa_config_ops *ops = vdpa->config; int r = 0; - r = vhost_iotlb_add_range(dev->iotlb, iova, iova + size - 1, - pa, perm); + r = vhost_iotlb_add_range_ctx(dev->iotlb, iova, iova + size - 1, + pa, perm, opaque); if (r) return r; if (ops->dma_map) { - r = ops->dma_map(vdpa, iova, size, pa, perm, NULL); + r = ops->dma_map(vdpa, iova, size, pa, perm, opaque); } else if (ops->set_map) { if (!v->in_batch) r = ops->set_map(vdpa, dev->iotlb); @@ -587,13 +607,15 @@ static int vhost_vdpa_map(struct vhost_vdpa *v, r = iommu_map(v->domain, iova, pa, size, perm_to_iommu_flags(perm)); } - - if (r) + if (r) { vhost_iotlb_del_range(dev->iotlb, iova, iova + size - 1); - else + return r; + } + + if (!vdpa->use_va) atomic64_add(size >> PAGE_SHIFT, &dev->mm->pinned_vm); - return r; + return 0; } static void vhost_vdpa_unmap(struct vhost_vdpa *v, u64 iova, u64 size) @@ -614,6 +636,56 @@ static void vhost_vdpa_unmap(struct vhost_vdpa *v, u64 iova, u64 size) } } +static int vhost_vdpa_va_map(struct vhost_vdpa *v, + u64 iova, u64 size, u64 uaddr, u32 perm) +{ + struct vhost_dev *dev = &v->vdev; + u64 offset, map_size, map_iova = iova; + struct vdpa_map_file *map_file; + struct vm_area_struct *vma; + int ret; + + mmap_read_lock(dev->mm); + + while (size) { + vma = find_vma(dev->mm, uaddr); + if (!vma) { + ret = -EINVAL; + break; + } + map_size = min(size, vma->vm_end - uaddr); + if (!(vma->vm_file && (vma->vm_flags & VM_SHARED) && + !(vma->vm_flags & (VM_IO | VM_PFNMAP)))) + goto next; + + map_file = kzalloc(sizeof(*map_file), GFP_KERNEL); + if (!map_file) { + ret = -ENOMEM; + break; + } + offset = (vma->vm_pgoff << PAGE_SHIFT) + uaddr - vma->vm_start; + map_file->offset = offset; + map_file->file = get_file(vma->vm_file); + ret = vhost_vdpa_map(v, map_iova, map_size, uaddr, + perm, map_file); + if (ret) { + fput(map_file->file); + kfree(map_file); + break; + } +next: + size -= map_size; + uaddr += map_size; + map_iova += map_size; + } + if (ret) + vhost_vdpa_unmap(v, iova, map_iova - iova); + + mmap_read_unlock(dev->mm); + + return ret; +} + static int vhost_vdpa_pa_map(struct vhost_vdpa *v, u64 iova, u64 size, u64 uaddr, u32 perm) { @@ -680,7 +752,7 @@ static int vhost_vdpa_pa_map(struct vhost_vdpa *v, csize = (last_pfn - map_pfn + 1) << PAGE_SHIFT; ret = vhost_vdpa_map(v, iova, csize, map_pfn << PAGE_SHIFT, - perm); + perm, NULL); if (ret) { /* * Unpin the pages that are left unmapped @@ -709,7 +781,7 @@ static int vhost_vdpa_pa_map(struct vhost_vdpa *v, /* Pin the rest chunk */ ret = vhost_vdpa_map(v, iova, (last_pfn - map_pfn + 1) << PAGE_SHIFT, - map_pfn << PAGE_SHIFT, perm); + map_pfn << PAGE_SHIFT, perm, NULL); out: if (ret) { if (nchunks) { @@ -742,6 +814,7 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, struct vhost_iotlb_msg *msg) { struct vhost_dev *dev = &v->vdev; + struct vdpa_device *vdpa = v->vdpa; struct vhost_iotlb *iotlb = dev->iotlb; if (msg->iova < v->range.first || !msg->size || @@ -753,6 +826,10 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, msg->iova + msg->size - 1)) return -EEXIST; + if (vdpa->use_va) + return vhost_vdpa_va_map(v, msg->iova, msg->size, + msg->uaddr, msg->perm); + return vhost_vdpa_pa_map(v, msg->iova, msg->size, msg->uaddr, msg->perm); } diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index 18f81612217e..d9efbf6a9ecc 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -65,6 +65,7 @@ struct vdpa_mgmt_dev; * @config: the configuration ops for this device. * @index: device index * @features_valid: were features initialized? for legacy guests + * @use_va: indicate whether virtual address must be used by this device * @nvqs: maximum number of supported virtqueues * @mdev: management device pointer; caller must setup when registering device as part * of dev_add() mgmtdev ops callback before invoking _vdpa_register_device(). @@ -75,6 +76,7 @@ struct vdpa_device { const struct vdpa_config_ops *config; unsigned int index; bool features_valid; + bool use_va; int nvqs; struct vdpa_mgmt_dev *mdev; }; @@ -90,6 +92,16 @@ struct vdpa_iova_range { }; /** + * Corresponding file area for device memory mapping + * @file: vma->vm_file for the mapping + * @offset: mapping offset in the vm_file + */ +struct vdpa_map_file { + struct file *file; + u64 offset; +}; + +/** * struct vdpa_config_ops - operations for configuring a vDPA device. * Note: vDPA device drivers are required to implement all of the * operations unless it is mentioned to be optional in the following @@ -280,7 +292,8 @@ struct vdpa_config_ops { struct vdpa_device *__vdpa_alloc_device(struct device *parent, const struct vdpa_config_ops *config, - size_t size, const char *name); + size_t size, const char *name, + bool use_va); /** * vdpa_alloc_device - allocate and initilaize a vDPA device @@ -290,15 +303,16 @@ struct vdpa_device *__vdpa_alloc_device(struct device *parent, * @parent: the parent device * @config: the bus operations that is supported by this device * @name: name of the vdpa device + * @use_va: indicate whether virtual address must be used by this device * * Return allocated data structure or ERR_PTR upon error */ -#define vdpa_alloc_device(dev_struct, member, parent, config, name) \ +#define vdpa_alloc_device(dev_struct, member, parent, config, name, use_va) \ container_of(__vdpa_alloc_device( \ parent, config, \ sizeof(dev_struct) + \ BUILD_BUG_ON_ZERO(offsetof( \ - dev_struct, member)), name), \ + dev_struct, member)), name, use_va), \ dev_struct, member) int vdpa_register_device(struct vdpa_device *vdev, int nvqs);