From patchwork Tue Aug 31 10:36:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12466931 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,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 522C7C432BE for ; Tue, 31 Aug 2021 10:38:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 357AD60C3E for ; Tue, 31 Aug 2021 10:38:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241238AbhHaKi6 (ORCPT ); Tue, 31 Aug 2021 06:38:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39058 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241153AbhHaKic (ORCPT ); Tue, 31 Aug 2021 06:38:32 -0400 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 88A05C061760 for ; Tue, 31 Aug 2021 03:37:36 -0700 (PDT) Received: by mail-pf1-x429.google.com with SMTP id 18so14573941pfh.9 for ; Tue, 31 Aug 2021 03:37:36 -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=uxUw2hcVSEAQgQhUPN5uVVCi3T7zx/tOCVC+l2FlBb0=; b=uaj+s5apkgC8JkyW1PxXsLPPQrCKOxks7K9IIyYQf1D7vM56ajxP+XRXxTgRq+5H3T pI8FajKMdX47pxI9raCceZt1nGT4BhJuwenDw2JwBgNFTx82NeYVqWNzp2jm/gWccyum oc+AbdNsDSpNWgjCoQtLg1dA+eu1HJ2XdDxCA3KNaLa2S+BJcedkhtAEIjxCmofG/5kg ODDwK39I8r99LvgVYki0xx3aghkcsiiimEx9bBuitK2fwP9o71BjIm0viQ+oqdNy1I5d dVqifftjAhSUiNdKNiJUjwixdb4Mx8m3e34Aj6QW1H4HEJS88VwEDGP9XWbEChgsuW4F Ladg== 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=uxUw2hcVSEAQgQhUPN5uVVCi3T7zx/tOCVC+l2FlBb0=; b=NIxbbDZdNC73ymnR/kjDlDoKiFPCnnbWMn9OtPM3BvlLJYyXA42Mvat/oB4jOfm09I j7H+E7qaCtn0WKgFpw8zI5ZpEa8CC6j7qxpVBMyPXSHJ5jbAPqX6ozhLyNxY1m5qqAA9 YxqDZ2Tu7/rqRoItLAKiTrNVHy6psRBsGSyiEer4DAs/lUu4VgpdZF/FvUu1jUe585qK WJrZBqroBJ+caBQV7tPoInpxdaeNZhalzg5/ot523kbib+1t5IjLJ39LZS/FHKWdqazE guD66Y7UfrcJrX1crUSugAtQrM1n4J5qH2Mq5cHGi+xXqObcfUB3i9D8sC6FKnE34WIW m4+Q== X-Gm-Message-State: AOAM531SSuMYoCw8+XmYQKABJ8aUKKSXZpwH19SW91Gg9dZAZbo8Bike eKQ1Ai2KX5yTKJCdbNB7AQ1R X-Google-Smtp-Source: ABdhPJxjxR4iWN2Xnq/G5G1OSYO70CubX1NZM1LhejCfcBC/02J6PY1OHR37Wanf6g+bWH4Mj+ayUw== X-Received: by 2002:a05:6a00:10ca:b0:3fe:3a9b:2100 with SMTP id d10-20020a056a0010ca00b003fe3a9b2100mr11529844pfu.59.1630406256094; Tue, 31 Aug 2021 03:37:36 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id t4sm16885664pfe.166.2021.08.31.03.37.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Aug 2021 03:37:35 -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, will@kernel.org, john.garry@huawei.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 v13 09/13] vdpa: factor out vhost_vdpa_pa_map() and vhost_vdpa_pa_unmap() Date: Tue, 31 Aug 2021 18:36:30 +0800 Message-Id: <20210831103634.33-10-xieyongji@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210831103634.33-1-xieyongji@bytedance.com> References: <20210831103634.33-1-xieyongji@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The upcoming patch is going to support VA mapping/unmapping. So let's factor out the logic of PA mapping/unmapping firstly to make the code more readable. Suggested-by: Jason Wang Signed-off-by: Xie Yongji Acked-by: Jason Wang --- drivers/vhost/vdpa.c | 55 +++++++++++++++++++++++++++++++++------------------- 1 file changed, 35 insertions(+), 20 deletions(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index ba030150b4b6..49a1f45ccef8 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -504,7 +504,7 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, return r; } -static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, u64 start, u64 last) +static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, u64 start, u64 last) { struct vhost_dev *dev = &v->vdev; struct vhost_iotlb *iotlb = dev->iotlb; @@ -526,6 +526,11 @@ static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, u64 start, u64 last) } } +static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, u64 start, u64 last) +{ + return vhost_vdpa_pa_unmap(v, start, last); +} + static void vhost_vdpa_iotlb_free(struct vhost_vdpa *v) { struct vhost_dev *dev = &v->vdev; @@ -606,38 +611,28 @@ static void vhost_vdpa_unmap(struct vhost_vdpa *v, u64 iova, u64 size) } } -static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, - struct vhost_iotlb_msg *msg) +static int vhost_vdpa_pa_map(struct vhost_vdpa *v, + u64 iova, u64 size, u64 uaddr, u32 perm) { struct vhost_dev *dev = &v->vdev; - struct vhost_iotlb *iotlb = dev->iotlb; struct page **page_list; unsigned long list_size = PAGE_SIZE / sizeof(struct page *); unsigned int gup_flags = FOLL_LONGTERM; unsigned long npages, cur_base, map_pfn, last_pfn = 0; unsigned long lock_limit, sz2pin, nchunks, i; - u64 iova = msg->iova; + u64 start = iova; long pinned; int ret = 0; - if (msg->iova < v->range.first || !msg->size || - msg->iova > U64_MAX - msg->size + 1 || - msg->iova + msg->size - 1 > v->range.last) - return -EINVAL; - - if (vhost_iotlb_itree_first(iotlb, msg->iova, - msg->iova + msg->size - 1)) - return -EEXIST; - /* Limit the use of memory for bookkeeping */ page_list = (struct page **) __get_free_page(GFP_KERNEL); if (!page_list) return -ENOMEM; - if (msg->perm & VHOST_ACCESS_WO) + if (perm & VHOST_ACCESS_WO) gup_flags |= FOLL_WRITE; - npages = PAGE_ALIGN(msg->size + (iova & ~PAGE_MASK)) >> PAGE_SHIFT; + npages = PAGE_ALIGN(size + (iova & ~PAGE_MASK)) >> PAGE_SHIFT; if (!npages) { ret = -EINVAL; goto free; @@ -651,7 +646,7 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, goto unlock; } - cur_base = msg->uaddr & PAGE_MASK; + cur_base = uaddr & PAGE_MASK; iova &= PAGE_MASK; nchunks = 0; @@ -682,7 +677,7 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, csize = (last_pfn - map_pfn + 1) << PAGE_SHIFT; ret = vhost_vdpa_map(v, iova, csize, map_pfn << PAGE_SHIFT, - msg->perm); + perm); if (ret) { /* * Unpin the pages that are left unmapped @@ -711,7 +706,7 @@ static int vhost_vdpa_process_iotlb_update(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, msg->perm); + map_pfn << PAGE_SHIFT, perm); out: if (ret) { if (nchunks) { @@ -730,13 +725,33 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, for (pfn = map_pfn; pfn <= last_pfn; pfn++) unpin_user_page(pfn_to_page(pfn)); } - vhost_vdpa_unmap(v, msg->iova, msg->size); + vhost_vdpa_unmap(v, start, size); } unlock: mmap_read_unlock(dev->mm); free: free_page((unsigned long)page_list); return ret; + +} + +static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, + struct vhost_iotlb_msg *msg) +{ + struct vhost_dev *dev = &v->vdev; + struct vhost_iotlb *iotlb = dev->iotlb; + + if (msg->iova < v->range.first || !msg->size || + msg->iova > U64_MAX - msg->size + 1 || + msg->iova + msg->size - 1 > v->range.last) + return -EINVAL; + + if (vhost_iotlb_itree_first(iotlb, msg->iova, + msg->iova + msg->size - 1)) + return -EEXIST; + + return vhost_vdpa_pa_map(v, msg->iova, msg->size, msg->uaddr, + msg->perm); } static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,