From patchwork Wed Aug 18 12:06:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444197 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 8CC3FC432BE for ; Wed, 18 Aug 2021 12:08:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7582E60EBC for ; Wed, 18 Aug 2021 12:08:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236514AbhHRMIp (ORCPT ); Wed, 18 Aug 2021 08:08:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235965AbhHRMIX (ORCPT ); Wed, 18 Aug 2021 08:08:23 -0400 Received: from mail-pl1-x632.google.com (mail-pl1-x632.google.com [IPv6:2607:f8b0:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 096A0C0613D9 for ; Wed, 18 Aug 2021 05:07:49 -0700 (PDT) Received: by mail-pl1-x632.google.com with SMTP id o10so1723244plg.0 for ; Wed, 18 Aug 2021 05:07:49 -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=dPJJmxsVnbJuWsaYefx+5ABSk3S/ct0HfhPILPNJBeY=; b=Il0dp2rPVUCBMX9KFhOtzGkP3WKDoZ1ZKEgN6kb2agZ8E5jDQdBcduO5z6+043hYpd Ufi8v00bjhHrLaYO9v2rUWDcl6NeckWKR50ZAjIC4vGPqrrZlcIMPniKBTLz+M0Ac2wW lvt2CQw2pwEwtNNuWnZO45Lx2NonUj7axKrI0LbgxlcXYK2MJA/2Yj/CJqtxZihF5DCw 5ze/wh02hcvuQ7d/Huk7Si32RAeQhRmnTq9PC//bqKcyMAfDvauBXt0nHLNbXlQDNDnQ 4Dsqf33aSduXN3Dv/itwrQsG8YwGNPtTScyWKAk0xLEiH1aFKpXXhY26VsmpguruySKm AP3w== 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=dPJJmxsVnbJuWsaYefx+5ABSk3S/ct0HfhPILPNJBeY=; b=qYoOApMvZQlBAwj5w0RrJDbx3h/IGFH0sTn/spbBDzyeXBNXlkvMoWsNw61e8wIX/d dPtPsjPSa6TPb7St2x4qUc4qj37y9QJdDJD7fpiOX6as/8nNEn9cd+3V0VVeYCKNJ39R So3YUYWLt63txZW3STqRKlRfJ/biaoaBwKSVdJge3Ble4KMnF00+lPEu5br3iFOsVSqT nwiqqSAab8KMKa6HSyf/DGoH/3Bu0MixU3732mkBkFMSOUuGzefqO8F1aM/YMgoU0WR0 0Y+afroKsQzU8jRuESwt818JWz4/MhmipZHbSpMaWrFvgP/BccBRRCAsdMTUuG+to755 Egsg== X-Gm-Message-State: AOAM533QHcbq0q7uc3yLlCdrPqZDBnaoqUwJRelKRfHi8u8yIIhDfbNm qrITNn0bjlxTwaniLuXDkVCe X-Google-Smtp-Source: ABdhPJwcXSEuwzRnGhI2y+Q5IbLvbn5O9K+BcqEVJ6ubab8h4kSTKekrk2aFvZ2U2B+Ykcq6j6DPIA== X-Received: by 2002:a17:90b:378c:: with SMTP id mz12mr8802850pjb.187.1629288468662; Wed, 18 Aug 2021 05:07:48 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id c15sm5205386pjr.22.2021.08.18.05.07.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:07:48 -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 01/12] iova: Export alloc_iova_fast() and free_iova_fast() Date: Wed, 18 Aug 2021 20:06:31 +0800 Message-Id: <20210818120642.165-2-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: linux-fsdevel@vger.kernel.org Export alloc_iova_fast() and free_iova_fast() so that some modules can make use of the per-CPU cache to get rid of rbtree spinlock in alloc_iova() and free_iova() during IOVA allocation. Signed-off-by: Xie Yongji Acked-by: Jason Wang Acked-by: Will Deacon --- drivers/iommu/iova.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c index b6cf5f16123b..3941ed6bb99b 100644 --- a/drivers/iommu/iova.c +++ b/drivers/iommu/iova.c @@ -521,6 +521,7 @@ alloc_iova_fast(struct iova_domain *iovad, unsigned long size, return new_iova->pfn_lo; } +EXPORT_SYMBOL_GPL(alloc_iova_fast); /** * free_iova_fast - free iova pfn range into rcache @@ -538,6 +539,7 @@ free_iova_fast(struct iova_domain *iovad, unsigned long pfn, unsigned long size) free_iova(iovad, pfn); } +EXPORT_SYMBOL_GPL(free_iova_fast); #define fq_ring_for_each(i, fq) \ for ((i) = (fq)->head; (i) != (fq)->tail; (i) = ((i) + 1) % IOVA_FQ_SIZE) From patchwork Wed Aug 18 12:06:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444199 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=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 CB597C4320E for ; Wed, 18 Aug 2021 12:08:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B11786103A for ; Wed, 18 Aug 2021 12:08:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235606AbhHRMI7 (ORCPT ); Wed, 18 Aug 2021 08:08:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45376 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236124AbhHRMIb (ORCPT ); Wed, 18 Aug 2021 08:08:31 -0400 Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A03D6C0613CF for ; Wed, 18 Aug 2021 05:07:52 -0700 (PDT) Received: by mail-pg1-x536.google.com with SMTP id x4so2011236pgh.1 for ; Wed, 18 Aug 2021 05:07:52 -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=CkhRtVDUgb41zlq5OfgVAHJFRMwL0PptQO/kVg6fccA=; b=OovSAa+epA24aO5u/6uAq1flAsC1ow2M+8fLj8oCp66s4dngG/1v4SFk+KWpajGcIo 0ASRai1lXZqvhfuj9PeHkOTmZ/zDsUIOcyqXarUc2S/SfKFPSxoF3lYdUyJ+EIWIV+Dg yvp5cHwAD/KqDJTJmISlwDPfT2UPt6DjNxvLNNh2NcJsrzCM9HJkvUJY2vzhstKMBVfV K4pZlgqvJuLljhLcMnVoirXXAqYOV6QelXUCvTJ1ZdNuLH9uIScEterj+pQYWdyMlN9z 5rzkIrqTb/iw9LeDMwTHoHUzBO6E1jXM3i2N2lJMsxdKQnzHCJ1veWsrWH9JZmfHyD8y /Wdg== 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=CkhRtVDUgb41zlq5OfgVAHJFRMwL0PptQO/kVg6fccA=; b=F5F2a5ewOM+5esnh2Ie8zESbAebf+hHhvU+hXIBgLj8w2taCJ698dpA6ub8eHEjm47 hQ9y0REX4iXLowlGBpTXUWDrzThDQwHTN827w6NiUdkD6q0G2sGKHd8ufXJslNuf196w EwBXHu4yXHhpXfjaYs9F8LGNVPDzhqmFf1Zq8HxW+NMuG6VSe8J7MAFoRHLmjm6z31qn gm032aWHQXg4KiAi0zsDjnpH+Sku6/73S+cXsxg9rTy9yvzKGqrDwO59TNcfbbBN3v0T tM7jhO4GoAGZxo+jeF8Bn0WenWM1LfjZwxk0D80xWKcEHWqQx5AlXslpUbPhUu36EwG1 b6ZQ== X-Gm-Message-State: AOAM531LTdhhxXwFvx9Yq97yOY3AVxdew+C9SL6itsIwUiF222IprTeJ iBTUToT4/hxkzrZNCzdF4GjC X-Google-Smtp-Source: ABdhPJwADZG0bCD91dAS/9CLSDalLvr2jMZAhlZq7FfHtKSxKbx5WGmFt3/oaOQYoi0HAdY6FS2TIw== X-Received: by 2002:a65:6459:: with SMTP id s25mr8703373pgv.7.1629288472254; Wed, 18 Aug 2021 05:07:52 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id h7sm4996162pjs.38.2021.08.18.05.07.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:07:51 -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 02/12] file: Export receive_fd() to modules Date: Wed, 18 Aug 2021 20:06:32 +0800 Message-Id: <20210818120642.165-3-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: linux-fsdevel@vger.kernel.org Export receive_fd() so that some modules can use it to pass file descriptor between processes without missing any security stuffs. Signed-off-by: Xie Yongji Acked-by: Jason Wang --- fs/file.c | 6 ++++++ include/linux/file.h | 7 +++---- 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/fs/file.c b/fs/file.c index 86dc9956af32..210e540672aa 100644 --- a/fs/file.c +++ b/fs/file.c @@ -1134,6 +1134,12 @@ int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags) return new_fd; } +int receive_fd(struct file *file, unsigned int o_flags) +{ + return __receive_fd(file, NULL, o_flags); +} +EXPORT_SYMBOL_GPL(receive_fd); + static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags) { int err = -EBADF; diff --git a/include/linux/file.h b/include/linux/file.h index 2de2e4613d7b..51e830b4fe3a 100644 --- a/include/linux/file.h +++ b/include/linux/file.h @@ -94,6 +94,9 @@ extern void fd_install(unsigned int fd, struct file *file); extern int __receive_fd(struct file *file, int __user *ufd, unsigned int o_flags); + +extern int receive_fd(struct file *file, unsigned int o_flags); + static inline int receive_fd_user(struct file *file, int __user *ufd, unsigned int o_flags) { @@ -101,10 +104,6 @@ static inline int receive_fd_user(struct file *file, int __user *ufd, return -EFAULT; return __receive_fd(file, ufd, o_flags); } -static inline int receive_fd(struct file *file, unsigned int o_flags) -{ - return __receive_fd(file, NULL, o_flags); -} int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags); extern void flush_delayed_fput(void); From patchwork Wed Aug 18 12:06:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444213 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 504FAC4320E for ; Wed, 18 Aug 2021 12:09:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2F60B6103A for ; Wed, 18 Aug 2021 12:09:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236825AbhHRMKN (ORCPT ); Wed, 18 Aug 2021 08:10:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45444 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236429AbhHRMIl (ORCPT ); Wed, 18 Aug 2021 08:08:41 -0400 Received: from mail-pl1-x632.google.com (mail-pl1-x632.google.com [IPv6:2607:f8b0:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CC4FAC0613A4 for ; Wed, 18 Aug 2021 05:07:56 -0700 (PDT) Received: by mail-pl1-x632.google.com with SMTP id a5so1665716plh.5 for ; Wed, 18 Aug 2021 05:07:56 -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=vPU5oouwG2zcS8yvvUNrpx7q9K6y4xHU7Uj02CjZsZk=; b=UIWajj907fM0ya/crIoSMA1C7IpAGpoZSfmlQTaOLvISGvbNFliV3lOWPPV7xgNTKC ///b6XBGp1KvZ9CFR5EDvB+iY8XK7q5BtmHgdPSxm0is9Ir7+fd3zVC6w2DwDTEAbtrm aXFyY+6LngaMYmQURkXGu8bIDVf2cHUiYyOhc0AUrBN9LcQcv/0QMBHguEh1ZX+LEY7W Jus0jgcLotsjcZNn8zQzYSratENyXmrF5ayCDbruWXSVk6RPn6VbqirsJTRAOhiJDWUa INgeynj5RqY+//cZPxLAtP9nVLS3O4toWE0mSMYrs7zBsSEyJ822UYQ43/JzCCXOorjJ p/rg== 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=vPU5oouwG2zcS8yvvUNrpx7q9K6y4xHU7Uj02CjZsZk=; b=DQ5+6VFL7arEpzDstMDtYzj90jek0Y3KEyEwXhu9AM2WPKxnkFtzqd1JjaXCIaBiiY fq/dCpxM38kM8xfCO9r82/sjHQr1OGdAESwOMC6MCmcxei7w/PO81gP6ohiQf4M6+Cxz GBtU81K3TLXHzwsFdWp/9hUR1ecvfsjitQQwK5kPc9kMWFVn9cplAR3D/N4eJcysWggb aJCs+8U6Pq2w7mtXq3S9YhXX3sKrYt6Si0aqDr/w52HGyadhZqJ+yXSwF2mp9t7yCNBD 7SxLGx5ih6cfLUKan7W1EeynfOI4hu7IXSZwrAnqxUgZdO79LRnH6ZtOPBX5ewgDxzct lBaw== X-Gm-Message-State: AOAM533UqrELA4Ie6/iVY7JCBPQc9Emx36ef6CDfosrkblDUwz1yPXFU GzUMbxEsvxHgsB3Q8EqmtO04 X-Google-Smtp-Source: ABdhPJyML7UjoOGnuzKUl0aecwVHSiqfNHLfBBbNYh0kHidbXZ6/zSyvUYwI91BMoTSfE98d6IjB0Q== X-Received: by 2002:a17:90a:8c05:: with SMTP id a5mr8717233pjo.95.1629288476402; Wed, 18 Aug 2021 05:07:56 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id w2sm5014486pjq.5.2021.08.18.05.07.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:07:55 -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 03/12] vdpa: Fix some coding style issues Date: Wed, 18 Aug 2021 20:06:33 +0800 Message-Id: <20210818120642.165-4-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: linux-fsdevel@vger.kernel.org Fix some code indent issues and following checkpatch warning: WARNING: Prefer 'unsigned int' to bare use of 'unsigned' 371: FILE: include/linux/vdpa.h:371: +static inline void vdpa_get_config(struct vdpa_device *vdev, unsigned offset, Signed-off-by: Xie Yongji Acked-by: Jason Wang Reviewed-by: Stefano Garzarella --- include/linux/vdpa.h | 34 +++++++++++++++++----------------- 1 file changed, 17 insertions(+), 17 deletions(-) diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index 954b340f6c2f..8a645f8f4476 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -43,17 +43,17 @@ struct vdpa_vq_state_split { * @last_used_idx: used index */ struct vdpa_vq_state_packed { - u16 last_avail_counter:1; - u16 last_avail_idx:15; - u16 last_used_counter:1; - u16 last_used_idx:15; + u16 last_avail_counter:1; + u16 last_avail_idx:15; + u16 last_used_counter:1; + u16 last_used_idx:15; }; struct vdpa_vq_state { - union { - struct vdpa_vq_state_split split; - struct vdpa_vq_state_packed packed; - }; + union { + struct vdpa_vq_state_split split; + struct vdpa_vq_state_packed packed; + }; }; struct vdpa_mgmt_dev; @@ -131,7 +131,7 @@ struct vdpa_iova_range { * @vdev: vdpa device * @idx: virtqueue index * @state: pointer to returned state (last_avail_idx) - * @get_vq_notification: Get the notification area for a virtqueue + * @get_vq_notification: Get the notification area for a virtqueue * @vdev: vdpa device * @idx: virtqueue index * Returns the notifcation area @@ -353,25 +353,25 @@ static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev) static inline void vdpa_reset(struct vdpa_device *vdev) { - const struct vdpa_config_ops *ops = vdev->config; + const struct vdpa_config_ops *ops = vdev->config; vdev->features_valid = false; - ops->set_status(vdev, 0); + ops->set_status(vdev, 0); } static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features) { - const struct vdpa_config_ops *ops = vdev->config; + const struct vdpa_config_ops *ops = vdev->config; vdev->features_valid = true; - return ops->set_features(vdev, features); + return ops->set_features(vdev, features); } - -static inline void vdpa_get_config(struct vdpa_device *vdev, unsigned offset, - void *buf, unsigned int len) +static inline void vdpa_get_config(struct vdpa_device *vdev, + unsigned int offset, void *buf, + unsigned int len) { - const struct vdpa_config_ops *ops = vdev->config; + const struct vdpa_config_ops *ops = vdev->config; /* * Config accesses aren't supposed to trigger before features are set. From patchwork Wed Aug 18 12:06:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444201 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 76ABBC432BE for ; Wed, 18 Aug 2021 12:08:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6114E610E8 for ; Wed, 18 Aug 2021 12:08:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237032AbhHRMJJ (ORCPT ); Wed, 18 Aug 2021 08:09:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236729AbhHRMI4 (ORCPT ); Wed, 18 Aug 2021 08:08:56 -0400 Received: from mail-pg1-x531.google.com (mail-pg1-x531.google.com [IPv6:2607:f8b0:4864:20::531]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA265C0612A7 for ; Wed, 18 Aug 2021 05:08:00 -0700 (PDT) Received: by mail-pg1-x531.google.com with SMTP id e7so2006662pgk.2 for ; Wed, 18 Aug 2021 05:08:00 -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=h3cBaHMfU52s7B4IKQZfv/Mv4AwRAWrj25gFgUhSo0U=; b=BSEezFXK8s9mIq1KmFaXULVeK3aSeyUogMR5eD4dSvtorIgyvtWBSxykWIDi2Mf8pr X5b162/G8WPmPUAGFLqIwL0ckm9Ys6EESEOmKMZOP0yUwunUWxu3972h2sop/3olzLJy +IddzNhjRBi9dNG9AR0ALhnxsPULvsgdBtWjeyQNb90yCiAG9ofU/B/rl//+ZPKJ4xvC +dt5yiC6AAS7EhGnuWJ7Q9BYkTy7pDDvx8baBuxDEgJnKxcO7qGyGDW7avh8GUwYddOo 33vORXAaeWGUY3lf7K8R+UkAVom11YqRB/1UwDF/3jh8VGWc6YZBRKuzp3zS4SAgt24N IbFQ== 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=h3cBaHMfU52s7B4IKQZfv/Mv4AwRAWrj25gFgUhSo0U=; b=pl0CdJS8wsR+8CG62LTMOKNyxx54vGUz99s2FTSHJetFvwLW7ZeX4GFs+8aqnikAau cONXUdvlUK9WSlbEmc1ICY5B+bzqliv9UbFn1mkhdMmaD1ESlaVfUGnwzmzxhDBDopcQ 3RAnDXXkRQTyDITHyGG5qp4alQiOaamzb65o8RK046QCMaPb1MFjl1yR892YbSLmtU+L LtD3W8sWLB91r+9dhVobTXNB5HYvO4fGKQS98FH/Hyke3ZG2nNJYzrzvM++yZrKhrwAO ERZWTe6Wkii1bY6SPB84o6ROdf8iaSTaSpjQ5GTTB6SYwehpufey3dtv5dqZgWmZccQY v9Vw== X-Gm-Message-State: AOAM533Hq/49dIidAVfr+cWIVq/peFReDBCeKamjCc42vEgNrtt/aQC+ +4KwLUpNeD9Ya7R9XDk1pfLq X-Google-Smtp-Source: ABdhPJylpJBebPvrUUXvngWerpOz2/KsXpZmy7xMNWLgfzpdybMKiIoAmHmo7Y5tBNvbw/zln+2/Kg== X-Received: by 2002:a62:e90b:0:b029:30e:4530:8dca with SMTP id j11-20020a62e90b0000b029030e45308dcamr9110885pfh.17.1629288480323; Wed, 18 Aug 2021 05:08:00 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id 73sm6785078pfz.73.2021.08.18.05.07.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:07:59 -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 04/12] vdpa: Add reset callback in vdpa_config_ops Date: Wed, 18 Aug 2021 20:06:34 +0800 Message-Id: <20210818120642.165-5-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: linux-fsdevel@vger.kernel.org This adds a new callback to support device specific reset behavior. The vdpa bus driver will call the reset function instead of setting status to zero during resetting if device driver supports the new callback. Signed-off-by: Xie Yongji --- drivers/vhost/vdpa.c | 9 +++++++-- include/linux/vdpa.h | 11 ++++++++++- 2 files changed, 17 insertions(+), 3 deletions(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index b07aa161f7ad..b1c91b4db0ba 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -157,7 +157,7 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp) struct vdpa_device *vdpa = v->vdpa; const struct vdpa_config_ops *ops = vdpa->config; u8 status, status_old; - int nvqs = v->nvqs; + int ret, nvqs = v->nvqs; u16 i; if (copy_from_user(&status, statusp, sizeof(status))) @@ -172,7 +172,12 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp) if (status != 0 && (ops->get_status(vdpa) & ~status) != 0) return -EINVAL; - ops->set_status(vdpa, status); + if (status == 0 && ops->reset) { + ret = ops->reset(vdpa); + if (ret) + return ret; + } else + ops->set_status(vdpa, status); if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) for (i = 0; i < nvqs; i++) diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index 8a645f8f4476..af7ea5ad795f 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -196,6 +196,9 @@ struct vdpa_iova_range { * @vdev: vdpa device * Returns the iova range supported by * the device. + * @reset: Reset device (optional) + * @vdev: vdpa device + * Returns integer: success (0) or error (< 0) * @set_map: Set device memory mapping (optional) * Needed for device that using device * specific DMA translation (on-chip IOMMU) @@ -263,6 +266,7 @@ struct vdpa_config_ops { const void *buf, unsigned int len); u32 (*get_generation)(struct vdpa_device *vdev); struct vdpa_iova_range (*get_iova_range)(struct vdpa_device *vdev); + int (*reset)(struct vdpa_device *vdev); /* DMA ops */ int (*set_map)(struct vdpa_device *vdev, struct vhost_iotlb *iotlb); @@ -351,12 +355,17 @@ static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev) return vdev->dma_dev; } -static inline void vdpa_reset(struct vdpa_device *vdev) +static inline int vdpa_reset(struct vdpa_device *vdev) { const struct vdpa_config_ops *ops = vdev->config; vdev->features_valid = false; + if (ops->reset) + return ops->reset(vdev); + ops->set_status(vdev, 0); + + return 0; } static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features) From patchwork Wed Aug 18 12:06:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444203 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=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 D7030C4338F for ; Wed, 18 Aug 2021 12:08:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BBC7860EBC for ; Wed, 18 Aug 2021 12:08:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236720AbhHRMJP (ORCPT ); Wed, 18 Aug 2021 08:09:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45448 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236797AbhHRMI6 (ORCPT ); Wed, 18 Aug 2021 08:08:58 -0400 Received: from mail-pj1-x1034.google.com (mail-pj1-x1034.google.com [IPv6:2607:f8b0:4864:20::1034]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A3999C0612AB for ; Wed, 18 Aug 2021 05:08:04 -0700 (PDT) Received: by mail-pj1-x1034.google.com with SMTP id j1so2457471pjv.3 for ; Wed, 18 Aug 2021 05:08:04 -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=Upxg8K2RjM27bp0rNDyYgc14eCE3NIhEIdC+t18pOCs=; b=lygAyD3Keugif/7sVDBS0Q0WByJtqD55lFbxdT5snDeED0JPyahQ3wtT1oTmd/nNab YI0+3N8u2CnAhouYjLrt5FI/zRDPh+xjkeiBRbuBaw4yBwZcdpS5c+n+kJsgc+cZ59YU u2oOzgjEWW5Mpxf4M8OXllJPqNvTAuUYwxr9efXDrsvtc2zMeb2R4jci5Q8LkpOkAGVo nBYBnmI5yCDv9ZFIP+4XR0Cc3hWps8F6T+lqRcTYBnCHbMgTRfSATpE+zVZrOIiUH/c2 ZOw4QXOAhQ7R3EWtb2d6awNdUcI8Gp3/S07gCrocQRhZuxHdS/QRSYuMchNsJXeIysoW gwvA== 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=Upxg8K2RjM27bp0rNDyYgc14eCE3NIhEIdC+t18pOCs=; b=BvSinQ7q/6DWfC8TAAKrfy/XOrVAp7X71V/7oG7Zd9OCzYLgoOkHqFdGw1zHsmr4ly sGo3ndv9rmkzRsuVtd9sWhPUOE2HlfhdkK/Uvd335w93Odl794PZO1rtpAHKvdxTri/v QMrfVyQfHtDv6n25ehw8ApQ+ryH5319V+iEMnGacRZphoATd6SWTn3PR4UyH/yI9Bvsn RilklvJ0IP/BJvqHi6VQgJQB9EwhcO21XTagLB7ufvL31CGWKLe7p5yqKivCjMLGPJ2v 4EHlIftcCSRidswzQNlhYm4zfzJ8lgHRK/YVvb8MgOdsfH6kqYLoKGvDuVImhmwT45kC y5AA== X-Gm-Message-State: AOAM530SroSkIcFlnACEGS7DHumuObrxtqChp2AmT22QzU7a4N1y9lbD 0wpa2BpyIilHe1kZD5mLiMs/ X-Google-Smtp-Source: ABdhPJx2zpHHk/rm1pUU6+vYW29Qy78558N3aIjYPaB+DOhvx26kSUU8EJK1qwKqbMvnWiWPs1Xy+g== X-Received: by 2002:a17:90a:d149:: with SMTP id t9mr8962859pjw.0.1629288484275; Wed, 18 Aug 2021 05:08:04 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id y62sm6138669pfy.183.2021.08.18.05.08.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:08:03 -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 05/12] vhost-vdpa: Handle the failure of vdpa_reset() Date: Wed, 18 Aug 2021 20:06:35 +0800 Message-Id: <20210818120642.165-6-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: linux-fsdevel@vger.kernel.org The vdpa_reset() may fail now. This adds check to its return value and fail the vhost_vdpa_open(). Signed-off-by: Xie Yongji Acked-by: Jason Wang Reviewed-by: Stefano Garzarella --- drivers/vhost/vdpa.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index b1c91b4db0ba..d99d75ad30cc 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -116,12 +116,13 @@ static void vhost_vdpa_unsetup_vq_irq(struct vhost_vdpa *v, u16 qid) irq_bypass_unregister_producer(&vq->call_ctx.producer); } -static void vhost_vdpa_reset(struct vhost_vdpa *v) +static int vhost_vdpa_reset(struct vhost_vdpa *v) { struct vdpa_device *vdpa = v->vdpa; - vdpa_reset(vdpa); v->in_batch = 0; + + return vdpa_reset(vdpa); } static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp) @@ -868,7 +869,9 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep) return -EBUSY; nvqs = v->nvqs; - vhost_vdpa_reset(v); + r = vhost_vdpa_reset(v); + if (r) + goto err; vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL); if (!vqs) { From patchwork Wed Aug 18 12:06:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444215 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 526DCC4338F for ; Wed, 18 Aug 2021 12:09:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 399346103A for ; Wed, 18 Aug 2021 12:09:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237583AbhHRMKT (ORCPT ); Wed, 18 Aug 2021 08:10:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45522 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236849AbhHRMI7 (ORCPT ); Wed, 18 Aug 2021 08:08:59 -0400 Received: from mail-pl1-x633.google.com (mail-pl1-x633.google.com [IPv6:2607:f8b0:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 53769C06121D for ; Wed, 18 Aug 2021 05:08:08 -0700 (PDT) Received: by mail-pl1-x633.google.com with SMTP id u15so1620881plg.13 for ; Wed, 18 Aug 2021 05:08:08 -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=CGl/RjOOzzXlpDeA69Ku950YCkBGnktZEIYihkRI6vQ=; b=SplntVBkf3p6sEVRj22a+O+AFY/g79enTKK7l6nV4j6WMY7N2DeLJ2PfsWHpKuD0n6 yryZpACPPOZVKkDtyxSB7hMi7xLSVafooFtE/QBTsSJLqahD81t3TI78tX5eBFKVOPSI H6Qvoqp2FFsRybVszT+XkaWhRRfQcfY+CPE/VlBvO3tibdrsx4xwEyoNVj5HrEODtqg9 1q9w5qA/VImCO8ILlK4aqOK92xQ8hTWB7gtmX2bRZDMTq/PPkx23QO/f9Bb6BbCxGX2i 4n/y99NWJptctZWgN2/u78BeaC3W8RZvxTOCJhTCBf6b9PnT4v6DskSjeJ2f5UM6H60X ETvw== 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=CGl/RjOOzzXlpDeA69Ku950YCkBGnktZEIYihkRI6vQ=; b=MQ/Ze8CnTOEGenNqPM8ofP3oQL+v2DJz+zQiYTVGpRprYTkyW2iw4B5Nz3JUDzwqMD kIZ2lf7S7DcJjOy4ufiJKtxSsGqF7GpJXSY1b5v8vppGw/StWE6nHc55L/Eev1Ec6JOS q9DogfmuIclw34j/tIspfwvjbpW5r3i3RPdC55NB94dBI42djWjs1oPIA0WVf9WqbgKV BrVjAyNwZWPYrzKnM4+uSa/ody/RYdlcuYShOdvuT8CkjaQx/FY0ipHb5Ti38Zn00jvD Z1PmL+y7aEEQpF+GNrGNQkKirhJ9WjEfZ0YfeQ3JYscHwUXJfGIAlv1qDi+KoD78CkZm TIVA== X-Gm-Message-State: AOAM531ihAMQNKB6foHSiaa7Hp7ndmLllPs/8NaecIJU4IMaTBvAL4Ch dr+sTKpQSOtQhR7g4QyKIQH2 X-Google-Smtp-Source: ABdhPJxV5x/bqOLhZ8b3/hD4Yitr9llG8hvZDf/QtVkhkqVi1olfWYIX+K7V1mc9KEGyn14z2J3R3Q== X-Received: by 2002:a17:90b:3014:: with SMTP id hg20mr9252900pjb.140.1629288487947; Wed, 18 Aug 2021 05:08:07 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id j6sm7017557pgq.0.2021.08.18.05.08.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:08:07 -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 06/12] vhost-iotlb: Add an opaque pointer for vhost IOTLB Date: Wed, 18 Aug 2021 20:06:36 +0800 Message-Id: <20210818120642.165-7-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: linux-fsdevel@vger.kernel.org Add an opaque pointer for vhost IOTLB. And introduce vhost_iotlb_add_range_ctx() to accept it. Suggested-by: Jason Wang Signed-off-by: Xie Yongji Acked-by: Jason Wang --- drivers/vhost/iotlb.c | 20 ++++++++++++++++---- include/linux/vhost_iotlb.h | 3 +++ 2 files changed, 19 insertions(+), 4 deletions(-) diff --git a/drivers/vhost/iotlb.c b/drivers/vhost/iotlb.c index 0582079e4bcc..670d56c879e5 100644 --- a/drivers/vhost/iotlb.c +++ b/drivers/vhost/iotlb.c @@ -36,19 +36,21 @@ void vhost_iotlb_map_free(struct vhost_iotlb *iotlb, EXPORT_SYMBOL_GPL(vhost_iotlb_map_free); /** - * vhost_iotlb_add_range - add a new range to vhost IOTLB + * vhost_iotlb_add_range_ctx - add a new range to vhost IOTLB * @iotlb: the IOTLB * @start: start of the IOVA range * @last: last of IOVA range * @addr: the address that is mapped to @start * @perm: access permission of this range + * @opaque: the opaque pointer for the new mapping * * Returns an error last is smaller than start or memory allocation * fails */ -int vhost_iotlb_add_range(struct vhost_iotlb *iotlb, - u64 start, u64 last, - u64 addr, unsigned int perm) +int vhost_iotlb_add_range_ctx(struct vhost_iotlb *iotlb, + u64 start, u64 last, + u64 addr, unsigned int perm, + void *opaque) { struct vhost_iotlb_map *map; @@ -71,6 +73,7 @@ int vhost_iotlb_add_range(struct vhost_iotlb *iotlb, map->last = last; map->addr = addr; map->perm = perm; + map->opaque = opaque; iotlb->nmaps++; vhost_iotlb_itree_insert(map, &iotlb->root); @@ -80,6 +83,15 @@ int vhost_iotlb_add_range(struct vhost_iotlb *iotlb, return 0; } +EXPORT_SYMBOL_GPL(vhost_iotlb_add_range_ctx); + +int vhost_iotlb_add_range(struct vhost_iotlb *iotlb, + u64 start, u64 last, + u64 addr, unsigned int perm) +{ + return vhost_iotlb_add_range_ctx(iotlb, start, last, + addr, perm, NULL); +} EXPORT_SYMBOL_GPL(vhost_iotlb_add_range); /** diff --git a/include/linux/vhost_iotlb.h b/include/linux/vhost_iotlb.h index 6b09b786a762..2d0e2f52f938 100644 --- a/include/linux/vhost_iotlb.h +++ b/include/linux/vhost_iotlb.h @@ -17,6 +17,7 @@ struct vhost_iotlb_map { u32 perm; u32 flags_padding; u64 __subtree_last; + void *opaque; }; #define VHOST_IOTLB_FLAG_RETIRE 0x1 @@ -29,6 +30,8 @@ struct vhost_iotlb { unsigned int flags; }; +int vhost_iotlb_add_range_ctx(struct vhost_iotlb *iotlb, u64 start, u64 last, + u64 addr, unsigned int perm, void *opaque); int vhost_iotlb_add_range(struct vhost_iotlb *iotlb, u64 start, u64 last, u64 addr, unsigned int perm); void vhost_iotlb_del_range(struct vhost_iotlb *iotlb, u64 start, u64 last); From patchwork Wed Aug 18 12:06:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444205 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 095FCC4338F for ; Wed, 18 Aug 2021 12:08:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E58CF60F58 for ; Wed, 18 Aug 2021 12:08:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237532AbhHRMJZ (ORCPT ); Wed, 18 Aug 2021 08:09:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45434 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237124AbhHRMJM (ORCPT ); Wed, 18 Aug 2021 08:09:12 -0400 Received: from mail-pg1-x52d.google.com (mail-pg1-x52d.google.com [IPv6:2607:f8b0:4864:20::52d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 45BC0C0611C6 for ; Wed, 18 Aug 2021 05:08:12 -0700 (PDT) Received: by mail-pg1-x52d.google.com with SMTP id y23so2008672pgi.7 for ; Wed, 18 Aug 2021 05:08:12 -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=gmTErZoHuljLWy5ftQQYPa0Y5andptGPajJ0BViKZSc=; b=E3gyfzX3p6VBgxg4pWT29QlWqOVlMy2BbTsKDlOSqzh+60rUYJOYzZg/a/5H3opHzL saLXHrsiT1qdodUTrFNAgvKbawgYE3Zbm7sn9ZpSgO/ujOQBcpFtfGY4XwBjUDn6GNal EhHyVOkhOeoCKu7mzikuQ1LEvOCr0QP3Ui1owbajYTEZ06+xgudTTGigvPrJ2d4x58EY MmNck5Ubt3Ii6BQ75nMino2+g6g1YOBh3xKoyB6i659GtUm1nXhgpamk38ax4ZDs77eC LhhnoMrfcRaaR3SJ/oWEsIHbg5n7LcIB7PTvdS74RYTDsSB0MVlf2hh+yaU9DqxCtMbV WlfQ== 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=gmTErZoHuljLWy5ftQQYPa0Y5andptGPajJ0BViKZSc=; b=ZZxFlR/UJEdYS5ZuhYalwye27FQ+V+bF+GSncx1vGfkxebrDH1Ii2bYudkOD/x3VQq RwPnxCC2cK6siOvsdeLdeQ7V6vNgOsXse74e6BkSE3u1ZY+fGWosY4Xhc87ChC4s/gTq NZwKY1nkUv7cgDsSEu53RzhXHbhdWTfddZ/fvGcBKuye6vtfck7+AO2v48+Xi5l2WJvb RQzlEaci0GRENF/0l1fF0dCCsfiTmlNlNgQSW3jhkJw9fhdLpz6TVEqL5otoXCw2uofa HzA2jwJg9fGufrEqxRhDWaZZyzU7vQmOs9HaBPCNYZwdIWD7yyJTEnSmlQCYaqj7+adv CZVg== X-Gm-Message-State: AOAM530gGKF98wkj9Ibb1EGA1cebzPj+YZSGXE4UYfhOpfR7F+aZ/fwr MNAUBJwhbTdHJwd+FsaAh20m X-Google-Smtp-Source: ABdhPJxmHpTevC3n4Gyq6WE+y24vE0c1i9BWHhgK52+NypaaWeKzW65MHbptj1Q4rFojFfdr/JykVQ== X-Received: by 2002:a62:8f86:0:b029:32e:33d7:998b with SMTP id n128-20020a628f860000b029032e33d7998bmr9257363pfd.64.1629288491854; Wed, 18 Aug 2021 05:08:11 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id u24sm6642220pfm.81.2021.08.18.05.08.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:08:11 -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 07/12] vdpa: Add an opaque pointer for vdpa_config_ops.dma_map() Date: Wed, 18 Aug 2021 20:06:37 +0800 Message-Id: <20210818120642.165-8-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: linux-fsdevel@vger.kernel.org Add an opaque pointer for DMA mapping. Suggested-by: Jason Wang Signed-off-by: Xie Yongji Acked-by: Jason Wang --- drivers/vdpa/vdpa_sim/vdpa_sim.c | 6 +++--- drivers/vhost/vdpa.c | 2 +- include/linux/vdpa.h | 2 +- 3 files changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c index e30d89b399d9..827d613c4eb6 100644 --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c @@ -544,14 +544,14 @@ static int vdpasim_set_map(struct vdpa_device *vdpa, } static int vdpasim_dma_map(struct vdpa_device *vdpa, u64 iova, u64 size, - u64 pa, u32 perm) + u64 pa, u32 perm, void *opaque) { struct vdpasim *vdpasim = vdpa_to_sim(vdpa); int ret; spin_lock(&vdpasim->iommu_lock); - ret = vhost_iotlb_add_range(vdpasim->iommu, iova, iova + size - 1, pa, - perm); + ret = vhost_iotlb_add_range_ctx(vdpasim->iommu, iova, iova + size - 1, + pa, perm, opaque); spin_unlock(&vdpasim->iommu_lock); return ret; diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index d99d75ad30cc..87ab104792fb 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -574,7 +574,7 @@ static int vhost_vdpa_map(struct vhost_vdpa *v, return r; if (ops->dma_map) { - r = ops->dma_map(vdpa, iova, size, pa, perm); + r = ops->dma_map(vdpa, iova, size, pa, perm, NULL); } else if (ops->set_map) { if (!v->in_batch) r = ops->set_map(vdpa, dev->iotlb); diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index af7ea5ad795f..18f81612217e 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -271,7 +271,7 @@ struct vdpa_config_ops { /* DMA ops */ int (*set_map)(struct vdpa_device *vdev, struct vhost_iotlb *iotlb); int (*dma_map)(struct vdpa_device *vdev, u64 iova, u64 size, - u64 pa, u32 perm); + u64 pa, u32 perm, void *opaque); int (*dma_unmap)(struct vdpa_device *vdev, u64 iova, u64 size); /* Free device resources */ From patchwork Wed Aug 18 12:06:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444207 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 30D3EC4338F for ; Wed, 18 Aug 2021 12:09:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 16E8E60F58 for ; Wed, 18 Aug 2021 12:09:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237204AbhHRMJm (ORCPT ); Wed, 18 Aug 2021 08:09:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45518 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237216AbhHRMJN (ORCPT ); Wed, 18 Aug 2021 08:09:13 -0400 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 649BDC0611BD for ; Wed, 18 Aug 2021 05:08:16 -0700 (PDT) Received: by mail-pl1-x630.google.com with SMTP id u15so1621126plg.13 for ; Wed, 18 Aug 2021 05:08:16 -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=YNK7f4uyw5NVrjg2FG5kT3zftXk3os6H0+9a35SkuFg=; b=sZ8ZWOkoWIDcbFX+usFktFoLXrn/SLIX1VNrbuwZ8cGWytT02DpyO1BGQlv/+NKtuC KfsT9dmhGffJ+gMtZ4znIe2NpnhySrgJlnHyLvUexGckOF72eMJ05zUh3uYwur2wPfXg lboRELagRDzlP+M7+RIq/JhsTxNbNuo5ykGPnuZaJbji+qgjho2qwFy0nxBD32uLU9Ll bfcpQxfUEVvbEX+sH94lwieuMEu2TNiIZZzdppTL0MojcetsWfPxvlyNVY+mAMyuGCUY xNgY2DYczkTpn0QK2OrYVkPTTmUHpC9eSG3B7Fx4Y5LEVk+PGR/TAx3z+krsY/ErsN9F 94SQ== 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=YNK7f4uyw5NVrjg2FG5kT3zftXk3os6H0+9a35SkuFg=; b=PcPemOnqasCHMob8x1a7CSm7+eq+iGVNHx7rlIuwQaQWsQf4DIzaZtvnEzwAbyotvL /TGIXYbYKZXbpdH74MqKEh14tuM1e//YcgwcV78cqs6A0tsdFWE5m6YCUQrL6tq3z5ZY A2q6JhWOVXN8Ahb07YfKDJiDL9c5dtZoqUodu5YTnkqqYusF07xwn26a2GIOzT/aL2U0 PC9OLxCey18ZHG6pYZ5TxHsEZPinN9+jzFgVsNF5p/bfG3GiTiJy8YULGRmaiGSBO4n+ 8D7ij1tHAWqNNgpN61wKefYeWcJ2wKl+T4VvZOQ7rjnLK16mBw/sb1RddjsVClKAsTff GhwA== X-Gm-Message-State: AOAM530yJc+0gCGOF/jiRaTXPAXESTQ5vpYbsUrtkz/jpxFGPXyEp0T3 VUD7+GJHZtDTAzQxczXzvVQs X-Google-Smtp-Source: ABdhPJwc3caz7ExZO2fXxhk0TkDGpwJcYxZ2RYYxBXCnJ950ZEkaN9AQ4hMRc4Wrg+lht7YUCcXhVA== X-Received: by 2002:a17:90a:8b95:: with SMTP id z21mr8805273pjn.131.1629288495877; Wed, 18 Aug 2021 05:08:15 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id n32sm7072638pgl.69.2021.08.18.05.08.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:08:15 -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 08/12] vdpa: factor out vhost_vdpa_pa_map() and vhost_vdpa_pa_unmap() Date: Wed, 18 Aug 2021 20:06:38 +0800 Message-Id: <20210818120642.165-9-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: linux-fsdevel@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 87ab104792fb..80c7dd168b57 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -507,7 +507,7 @@ 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; @@ -529,6 +529,11 @@ 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; @@ -609,38 +614,28 @@ 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; @@ -654,7 +649,7 @@ 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; @@ -685,7 +680,7 @@ 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 @@ -714,7 +709,7 @@ 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) { @@ -733,13 +728,33 @@ 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, 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: 12444209 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 A4616C432BE for ; Wed, 18 Aug 2021 12:09:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8D0F660EBC for ; Wed, 18 Aug 2021 12:09:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237565AbhHRMJq (ORCPT ); Wed, 18 Aug 2021 08:09:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45382 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236500AbhHRMJO (ORCPT ); Wed, 18 Aug 2021 08:09:14 -0400 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1D378C061141 for ; Wed, 18 Aug 2021 05:08:20 -0700 (PDT) Received: by mail-pj1-x1033.google.com with SMTP id u21-20020a17090a8915b02901782c36f543so8718586pjn.4 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=BPCxxNqe+b0K4Ek4wWDQ6bMgHWuBWPqVHupvTPp0TOQhxv9mB3agLgrhuPQqxaG3Nu yPNJxaDMUQIRx/nUNV7RwY0BX2vUkRpVlFnEwUIoqxuBNLFoLR3ntiXReQbpgxcHi++f AsNBy+siEkUY+0f71NGwkyt9H7COfUJgl9oUlpl5fnuxKHaNBkYx2+Sfg0YZ3c8G3kvn iWgZXdOqJA+W8dOcxWpWkKKpggRJ0Nex9x+H/9LPKEbVHrAhRUenjxvgy4JBpXremwX8 OI5CgkfrJyO/llzjPQnM4GtzYWbKxFMOkizZF+GRRBxJzLw88KDMYJc4+vbS0Nyk+m3+ MTOA== X-Gm-Message-State: AOAM530WB3uy/smPRUMoh++zM6yO48Ki0LuBy7qOhFrumTrp7SYCvO4/ e9E75lSWoZNRU+U6yhuXvhbm 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: linux-fsdevel@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); From patchwork Wed Aug 18 12:06:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444211 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 E0CD4C432BE for ; Wed, 18 Aug 2021 12:09:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C552C6103A for ; Wed, 18 Aug 2021 12:09:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237250AbhHRMJw (ORCPT ); Wed, 18 Aug 2021 08:09:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45378 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236797AbhHRMJQ (ORCPT ); Wed, 18 Aug 2021 08:09:16 -0400 Received: from mail-pj1-x1034.google.com (mail-pj1-x1034.google.com [IPv6:2607:f8b0:4864:20::1034]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA073C061764 for ; Wed, 18 Aug 2021 05:08:23 -0700 (PDT) Received: by mail-pj1-x1034.google.com with SMTP id mq2-20020a17090b3802b0290178911d298bso2204115pjb.1 for ; Wed, 18 Aug 2021 05:08:23 -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=boDvnumz0Z9HtKt8jJZpmxg2ltpR+//8q/rdCl0P25k=; b=Wd2/5G6v0IAftUPUa0CNA+szpLyb4qzgGBHJy45limsyX78wQ4ywRVg6qRtyee4pxG tbZP+YpNmt6kkoPJersQ6F8QhJzvnzMI9XC7y4sXLsPAgG81jci0XYUwrwiD8GK2jUyK 6C0F0v1CcnWZ0uD6ozRekyUXJMpXEnFEJ9fDVTpPa0j5RsENRj4gps0R5MI9LWk9Dp3k 2zylpczhimR/0ZU0PmUrVZ0orMoPFDRXp6KIQsRBKWD9n1wZjhXyLQOROQEr6kol4LuR CysJPsB2VmyvNyItwn8jHizLCGrHNADcRIfOfXB+h66IM9Xw+I7o+0RKoNTJ6QGlU5W2 /dMg== 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=boDvnumz0Z9HtKt8jJZpmxg2ltpR+//8q/rdCl0P25k=; b=KdYzzU6+jNdLI7nttEk20mktfqqsrXCUmEjkbHhAoxIi2O88ffEOFZefXthboniSg1 gV5Ywvu4mdg6+60vWSH7YQfnJnBMdkWO5yVBqih2r7fIStWiQKE+fyAk/w7f3mh8NrUl 8+LrXqtwoMhU4pf5NuPrKJZis9JIeogs7SgcGK8JjeextJ+xc4fRwKOHOnp7rIKi0Jsp 81o0yEpTzYMEDSf3P9D0A4k14VExN4ap5+jYZLrhGQVxNPBxMsqTK0lYAQDyUxQSaLz/ flbLH/CTdK+gpWymOELb+LwY2S9orkjk3+zpKqZQPDPvUm2869DGBwq5/PC3UO0Bo54K thpQ== X-Gm-Message-State: AOAM530EebTJqNSx8NE5QYypSa4aNIKi9Gy4zGk7dG1RQPQp6ygidLcc TgH8sAmVWKLgEFUydFmc2b9V X-Google-Smtp-Source: ABdhPJw2Klhnec1V8L9Au5vO8c97WQJWhSpmQUjof7WGDtw2QDy3ckZSC5q4Og0i3lMJLvBD4siyGQ== X-Received: by 2002:a17:90a:c712:: with SMTP id o18mr9223207pjt.69.1629288503296; Wed, 18 Aug 2021 05:08:23 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id x19sm7504974pgk.37.2021.08.18.05.08.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:08:22 -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 10/12] vduse: Implement an MMU-based software IOTLB Date: Wed, 18 Aug 2021 20:06:40 +0800 Message-Id: <20210818120642.165-11-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: linux-fsdevel@vger.kernel.org This implements an MMU-based software IOTLB to support mapping kernel dma buffer into userspace dynamically. The basic idea behind it is treating MMU (VA->PA) as IOMMU (IOVA->PA). The software IOTLB will set up MMU mapping instead of IOMMU mapping for the DMA transfer so that the userspace process is able to use its virtual address to access the dma buffer in kernel. To avoid security issue, a bounce-buffering mechanism is introduced to prevent userspace accessing the original buffer directly which may contain other kernel data. During the mapping, unmapping, the software IOTLB will copy the data from the original buffer to the bounce buffer and back, depending on the direction of the transfer. And the bounce-buffer addresses will be mapped into the user address space instead of the original one. Signed-off-by: Xie Yongji Acked-by: Jason Wang --- drivers/vdpa/vdpa_user/iova_domain.c | 545 +++++++++++++++++++++++++++++++++++ drivers/vdpa/vdpa_user/iova_domain.h | 73 +++++ 2 files changed, 618 insertions(+) create mode 100644 drivers/vdpa/vdpa_user/iova_domain.c create mode 100644 drivers/vdpa/vdpa_user/iova_domain.h diff --git a/drivers/vdpa/vdpa_user/iova_domain.c b/drivers/vdpa/vdpa_user/iova_domain.c new file mode 100644 index 000000000000..1daae2608860 --- /dev/null +++ b/drivers/vdpa/vdpa_user/iova_domain.c @@ -0,0 +1,545 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MMU-based software IOTLB. + * + * Copyright (C) 2020-2021 Bytedance Inc. and/or its affiliates. All rights reserved. + * + * Author: Xie Yongji + * + */ + +#include +#include +#include +#include +#include +#include + +#include "iova_domain.h" + +static int vduse_iotlb_add_range(struct vduse_iova_domain *domain, + u64 start, u64 last, + u64 addr, unsigned int perm, + struct file *file, u64 offset) +{ + struct vdpa_map_file *map_file; + int ret; + + map_file = kmalloc(sizeof(*map_file), GFP_ATOMIC); + if (!map_file) + return -ENOMEM; + + map_file->file = get_file(file); + map_file->offset = offset; + + ret = vhost_iotlb_add_range_ctx(domain->iotlb, start, last, + addr, perm, map_file); + if (ret) { + fput(map_file->file); + kfree(map_file); + return ret; + } + return 0; +} + +static void vduse_iotlb_del_range(struct vduse_iova_domain *domain, + u64 start, u64 last) +{ + struct vdpa_map_file *map_file; + struct vhost_iotlb_map *map; + + while ((map = vhost_iotlb_itree_first(domain->iotlb, start, last))) { + map_file = (struct vdpa_map_file *)map->opaque; + fput(map_file->file); + kfree(map_file); + vhost_iotlb_map_free(domain->iotlb, map); + } +} + +int vduse_domain_set_map(struct vduse_iova_domain *domain, + struct vhost_iotlb *iotlb) +{ + struct vdpa_map_file *map_file; + struct vhost_iotlb_map *map; + u64 start = 0ULL, last = ULLONG_MAX; + int ret; + + spin_lock(&domain->iotlb_lock); + vduse_iotlb_del_range(domain, start, last); + + for (map = vhost_iotlb_itree_first(iotlb, start, last); map; + map = vhost_iotlb_itree_next(map, start, last)) { + map_file = (struct vdpa_map_file *)map->opaque; + ret = vduse_iotlb_add_range(domain, map->start, map->last, + map->addr, map->perm, + map_file->file, + map_file->offset); + if (ret) + goto err; + } + spin_unlock(&domain->iotlb_lock); + + return 0; +err: + vduse_iotlb_del_range(domain, start, last); + spin_unlock(&domain->iotlb_lock); + return ret; +} + +void vduse_domain_clear_map(struct vduse_iova_domain *domain, + struct vhost_iotlb *iotlb) +{ + struct vhost_iotlb_map *map; + u64 start = 0ULL, last = ULLONG_MAX; + + spin_lock(&domain->iotlb_lock); + for (map = vhost_iotlb_itree_first(iotlb, start, last); map; + map = vhost_iotlb_itree_next(map, start, last)) { + vduse_iotlb_del_range(domain, map->start, map->last); + } + spin_unlock(&domain->iotlb_lock); +} + +static int vduse_domain_map_bounce_page(struct vduse_iova_domain *domain, + u64 iova, u64 size, u64 paddr) +{ + struct vduse_bounce_map *map; + u64 last = iova + size - 1; + + while (iova <= last) { + map = &domain->bounce_maps[iova >> PAGE_SHIFT]; + if (!map->bounce_page) { + map->bounce_page = alloc_page(GFP_ATOMIC); + if (!map->bounce_page) + return -ENOMEM; + } + map->orig_phys = paddr; + paddr += PAGE_SIZE; + iova += PAGE_SIZE; + } + return 0; +} + +static void vduse_domain_unmap_bounce_page(struct vduse_iova_domain *domain, + u64 iova, u64 size) +{ + struct vduse_bounce_map *map; + u64 last = iova + size - 1; + + while (iova <= last) { + map = &domain->bounce_maps[iova >> PAGE_SHIFT]; + map->orig_phys = INVALID_PHYS_ADDR; + iova += PAGE_SIZE; + } +} + +static void do_bounce(phys_addr_t orig, void *addr, size_t size, + enum dma_data_direction dir) +{ + unsigned long pfn = PFN_DOWN(orig); + unsigned int offset = offset_in_page(orig); + char *buffer; + unsigned int sz = 0; + + while (size) { + sz = min_t(size_t, PAGE_SIZE - offset, size); + + buffer = kmap_atomic(pfn_to_page(pfn)); + if (dir == DMA_TO_DEVICE) + memcpy(addr, buffer + offset, sz); + else + memcpy(buffer + offset, addr, sz); + kunmap_atomic(buffer); + + size -= sz; + pfn++; + addr += sz; + offset = 0; + } +} + +static void vduse_domain_bounce(struct vduse_iova_domain *domain, + dma_addr_t iova, size_t size, + enum dma_data_direction dir) +{ + struct vduse_bounce_map *map; + unsigned int offset; + void *addr; + size_t sz; + + if (iova >= domain->bounce_size) + return; + + while (size) { + map = &domain->bounce_maps[iova >> PAGE_SHIFT]; + offset = offset_in_page(iova); + sz = min_t(size_t, PAGE_SIZE - offset, size); + + if (WARN_ON(!map->bounce_page || + map->orig_phys == INVALID_PHYS_ADDR)) + return; + + addr = page_address(map->bounce_page) + offset; + do_bounce(map->orig_phys + offset, addr, sz, dir); + size -= sz; + iova += sz; + } +} + +static struct page * +vduse_domain_get_coherent_page(struct vduse_iova_domain *domain, u64 iova) +{ + u64 start = iova & PAGE_MASK; + u64 last = start + PAGE_SIZE - 1; + struct vhost_iotlb_map *map; + struct page *page = NULL; + + spin_lock(&domain->iotlb_lock); + map = vhost_iotlb_itree_first(domain->iotlb, start, last); + if (!map) + goto out; + + page = pfn_to_page((map->addr + iova - map->start) >> PAGE_SHIFT); + get_page(page); +out: + spin_unlock(&domain->iotlb_lock); + + return page; +} + +static struct page * +vduse_domain_get_bounce_page(struct vduse_iova_domain *domain, u64 iova) +{ + struct vduse_bounce_map *map; + struct page *page = NULL; + + spin_lock(&domain->iotlb_lock); + map = &domain->bounce_maps[iova >> PAGE_SHIFT]; + if (!map->bounce_page) + goto out; + + page = map->bounce_page; + get_page(page); +out: + spin_unlock(&domain->iotlb_lock); + + return page; +} + +static void +vduse_domain_free_bounce_pages(struct vduse_iova_domain *domain) +{ + struct vduse_bounce_map *map; + unsigned long pfn, bounce_pfns; + + bounce_pfns = domain->bounce_size >> PAGE_SHIFT; + + for (pfn = 0; pfn < bounce_pfns; pfn++) { + map = &domain->bounce_maps[pfn]; + if (WARN_ON(map->orig_phys != INVALID_PHYS_ADDR)) + continue; + + if (!map->bounce_page) + continue; + + __free_page(map->bounce_page); + map->bounce_page = NULL; + } +} + +void vduse_domain_reset_bounce_map(struct vduse_iova_domain *domain) +{ + if (!domain->bounce_map) + return; + + spin_lock(&domain->iotlb_lock); + if (!domain->bounce_map) + goto unlock; + + vduse_iotlb_del_range(domain, 0, domain->bounce_size - 1); + domain->bounce_map = 0; +unlock: + spin_unlock(&domain->iotlb_lock); +} + +static int vduse_domain_init_bounce_map(struct vduse_iova_domain *domain) +{ + int ret = 0; + + if (domain->bounce_map) + return 0; + + spin_lock(&domain->iotlb_lock); + if (domain->bounce_map) + goto unlock; + + ret = vduse_iotlb_add_range(domain, 0, domain->bounce_size - 1, + 0, VHOST_MAP_RW, domain->file, 0); + if (ret) + goto unlock; + + domain->bounce_map = 1; +unlock: + spin_unlock(&domain->iotlb_lock); + return ret; +} + +static dma_addr_t +vduse_domain_alloc_iova(struct iova_domain *iovad, + unsigned long size, unsigned long limit) +{ + unsigned long shift = iova_shift(iovad); + unsigned long iova_len = iova_align(iovad, size) >> shift; + unsigned long iova_pfn; + + /* + * Freeing non-power-of-two-sized allocations back into the IOVA caches + * will come back to bite us badly, so we have to waste a bit of space + * rounding up anything cacheable to make sure that can't happen. The + * order of the unadjusted size will still match upon freeing. + */ + if (iova_len < (1 << (IOVA_RANGE_CACHE_MAX_SIZE - 1))) + iova_len = roundup_pow_of_two(iova_len); + iova_pfn = alloc_iova_fast(iovad, iova_len, limit >> shift, true); + + return iova_pfn << shift; +} + +static void vduse_domain_free_iova(struct iova_domain *iovad, + dma_addr_t iova, size_t size) +{ + unsigned long shift = iova_shift(iovad); + unsigned long iova_len = iova_align(iovad, size) >> shift; + + free_iova_fast(iovad, iova >> shift, iova_len); +} + +dma_addr_t vduse_domain_map_page(struct vduse_iova_domain *domain, + struct page *page, unsigned long offset, + size_t size, enum dma_data_direction dir, + unsigned long attrs) +{ + struct iova_domain *iovad = &domain->stream_iovad; + unsigned long limit = domain->bounce_size - 1; + phys_addr_t pa = page_to_phys(page) + offset; + dma_addr_t iova = vduse_domain_alloc_iova(iovad, size, limit); + + if (!iova) + return DMA_MAPPING_ERROR; + + if (vduse_domain_init_bounce_map(domain)) + goto err; + + if (vduse_domain_map_bounce_page(domain, (u64)iova, (u64)size, pa)) + goto err; + + if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) + vduse_domain_bounce(domain, iova, size, DMA_TO_DEVICE); + + return iova; +err: + vduse_domain_free_iova(iovad, iova, size); + return DMA_MAPPING_ERROR; +} + +void vduse_domain_unmap_page(struct vduse_iova_domain *domain, + dma_addr_t dma_addr, size_t size, + enum dma_data_direction dir, unsigned long attrs) +{ + struct iova_domain *iovad = &domain->stream_iovad; + + if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) + vduse_domain_bounce(domain, dma_addr, size, DMA_FROM_DEVICE); + + vduse_domain_unmap_bounce_page(domain, (u64)dma_addr, (u64)size); + vduse_domain_free_iova(iovad, dma_addr, size); +} + +void *vduse_domain_alloc_coherent(struct vduse_iova_domain *domain, + size_t size, dma_addr_t *dma_addr, + gfp_t flag, unsigned long attrs) +{ + struct iova_domain *iovad = &domain->consistent_iovad; + unsigned long limit = domain->iova_limit; + dma_addr_t iova = vduse_domain_alloc_iova(iovad, size, limit); + void *orig = alloc_pages_exact(size, flag); + + if (!iova || !orig) + goto err; + + spin_lock(&domain->iotlb_lock); + if (vduse_iotlb_add_range(domain, (u64)iova, (u64)iova + size - 1, + virt_to_phys(orig), VHOST_MAP_RW, + domain->file, (u64)iova)) { + spin_unlock(&domain->iotlb_lock); + goto err; + } + spin_unlock(&domain->iotlb_lock); + + *dma_addr = iova; + + return orig; +err: + *dma_addr = DMA_MAPPING_ERROR; + if (orig) + free_pages_exact(orig, size); + if (iova) + vduse_domain_free_iova(iovad, iova, size); + + return NULL; +} + +void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size, + void *vaddr, dma_addr_t dma_addr, + unsigned long attrs) +{ + struct iova_domain *iovad = &domain->consistent_iovad; + struct vhost_iotlb_map *map; + struct vdpa_map_file *map_file; + phys_addr_t pa; + + spin_lock(&domain->iotlb_lock); + map = vhost_iotlb_itree_first(domain->iotlb, (u64)dma_addr, + (u64)dma_addr + size - 1); + if (WARN_ON(!map)) { + spin_unlock(&domain->iotlb_lock); + return; + } + map_file = (struct vdpa_map_file *)map->opaque; + fput(map_file->file); + kfree(map_file); + pa = map->addr; + vhost_iotlb_map_free(domain->iotlb, map); + spin_unlock(&domain->iotlb_lock); + + vduse_domain_free_iova(iovad, dma_addr, size); + free_pages_exact(phys_to_virt(pa), size); +} + +static vm_fault_t vduse_domain_mmap_fault(struct vm_fault *vmf) +{ + struct vduse_iova_domain *domain = vmf->vma->vm_private_data; + unsigned long iova = vmf->pgoff << PAGE_SHIFT; + struct page *page; + + if (!domain) + return VM_FAULT_SIGBUS; + + if (iova < domain->bounce_size) + page = vduse_domain_get_bounce_page(domain, iova); + else + page = vduse_domain_get_coherent_page(domain, iova); + + if (!page) + return VM_FAULT_SIGBUS; + + vmf->page = page; + + return 0; +} + +static const struct vm_operations_struct vduse_domain_mmap_ops = { + .fault = vduse_domain_mmap_fault, +}; + +static int vduse_domain_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct vduse_iova_domain *domain = file->private_data; + + vma->vm_flags |= VM_DONTDUMP | VM_DONTEXPAND; + vma->vm_private_data = domain; + vma->vm_ops = &vduse_domain_mmap_ops; + + return 0; +} + +static int vduse_domain_release(struct inode *inode, struct file *file) +{ + struct vduse_iova_domain *domain = file->private_data; + + spin_lock(&domain->iotlb_lock); + vduse_iotlb_del_range(domain, 0, ULLONG_MAX); + vduse_domain_free_bounce_pages(domain); + spin_unlock(&domain->iotlb_lock); + put_iova_domain(&domain->stream_iovad); + put_iova_domain(&domain->consistent_iovad); + vhost_iotlb_free(domain->iotlb); + vfree(domain->bounce_maps); + kfree(domain); + + return 0; +} + +static const struct file_operations vduse_domain_fops = { + .owner = THIS_MODULE, + .mmap = vduse_domain_mmap, + .release = vduse_domain_release, +}; + +void vduse_domain_destroy(struct vduse_iova_domain *domain) +{ + fput(domain->file); +} + +struct vduse_iova_domain * +vduse_domain_create(unsigned long iova_limit, size_t bounce_size) +{ + struct vduse_iova_domain *domain; + struct file *file; + struct vduse_bounce_map *map; + unsigned long pfn, bounce_pfns; + + bounce_pfns = PAGE_ALIGN(bounce_size) >> PAGE_SHIFT; + if (iova_limit <= bounce_size) + return NULL; + + domain = kzalloc(sizeof(*domain), GFP_KERNEL); + if (!domain) + return NULL; + + domain->iotlb = vhost_iotlb_alloc(0, 0); + if (!domain->iotlb) + goto err_iotlb; + + domain->iova_limit = iova_limit; + domain->bounce_size = PAGE_ALIGN(bounce_size); + domain->bounce_maps = vzalloc(bounce_pfns * + sizeof(struct vduse_bounce_map)); + if (!domain->bounce_maps) + goto err_map; + + for (pfn = 0; pfn < bounce_pfns; pfn++) { + map = &domain->bounce_maps[pfn]; + map->orig_phys = INVALID_PHYS_ADDR; + } + file = anon_inode_getfile("[vduse-domain]", &vduse_domain_fops, + domain, O_RDWR); + if (IS_ERR(file)) + goto err_file; + + domain->file = file; + spin_lock_init(&domain->iotlb_lock); + init_iova_domain(&domain->stream_iovad, + PAGE_SIZE, IOVA_START_PFN); + init_iova_domain(&domain->consistent_iovad, + PAGE_SIZE, bounce_pfns); + + return domain; +err_file: + vfree(domain->bounce_maps); +err_map: + vhost_iotlb_free(domain->iotlb); +err_iotlb: + kfree(domain); + return NULL; +} + +int vduse_domain_init(void) +{ + return iova_cache_get(); +} + +void vduse_domain_exit(void) +{ + iova_cache_put(); +} diff --git a/drivers/vdpa/vdpa_user/iova_domain.h b/drivers/vdpa/vdpa_user/iova_domain.h new file mode 100644 index 000000000000..2722d9b8e21a --- /dev/null +++ b/drivers/vdpa/vdpa_user/iova_domain.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * MMU-based software IOTLB. + * + * Copyright (C) 2020-2021 Bytedance Inc. and/or its affiliates. All rights reserved. + * + * Author: Xie Yongji + * + */ + +#ifndef _VDUSE_IOVA_DOMAIN_H +#define _VDUSE_IOVA_DOMAIN_H + +#include +#include +#include + +#define IOVA_START_PFN 1 + +#define INVALID_PHYS_ADDR (~(phys_addr_t)0) + +struct vduse_bounce_map { + struct page *bounce_page; + u64 orig_phys; +}; + +struct vduse_iova_domain { + struct iova_domain stream_iovad; + struct iova_domain consistent_iovad; + struct vduse_bounce_map *bounce_maps; + size_t bounce_size; + unsigned long iova_limit; + int bounce_map; + struct vhost_iotlb *iotlb; + spinlock_t iotlb_lock; + struct file *file; +}; + +int vduse_domain_set_map(struct vduse_iova_domain *domain, + struct vhost_iotlb *iotlb); + +void vduse_domain_clear_map(struct vduse_iova_domain *domain, + struct vhost_iotlb *iotlb); + +dma_addr_t vduse_domain_map_page(struct vduse_iova_domain *domain, + struct page *page, unsigned long offset, + size_t size, enum dma_data_direction dir, + unsigned long attrs); + +void vduse_domain_unmap_page(struct vduse_iova_domain *domain, + dma_addr_t dma_addr, size_t size, + enum dma_data_direction dir, unsigned long attrs); + +void *vduse_domain_alloc_coherent(struct vduse_iova_domain *domain, + size_t size, dma_addr_t *dma_addr, + gfp_t flag, unsigned long attrs); + +void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size, + void *vaddr, dma_addr_t dma_addr, + unsigned long attrs); + +void vduse_domain_reset_bounce_map(struct vduse_iova_domain *domain); + +void vduse_domain_destroy(struct vduse_iova_domain *domain); + +struct vduse_iova_domain *vduse_domain_create(unsigned long iova_limit, + size_t bounce_size); + +int vduse_domain_init(void); + +void vduse_domain_exit(void); + +#endif /* _VDUSE_IOVA_DOMAIN_H */ From patchwork Wed Aug 18 12:06:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444219 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 60DF2C4320E for ; Wed, 18 Aug 2021 12:10:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 475A561058 for ; Wed, 18 Aug 2021 12:10:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237897AbhHRMKm (ORCPT ); Wed, 18 Aug 2021 08:10:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45448 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237528AbhHRMJY (ORCPT ); Wed, 18 Aug 2021 08:09:24 -0400 Received: from mail-pl1-x633.google.com (mail-pl1-x633.google.com [IPv6:2607:f8b0:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F4BCC0617AE for ; Wed, 18 Aug 2021 05:08:28 -0700 (PDT) Received: by mail-pl1-x633.google.com with SMTP id a5so1666633plh.5 for ; Wed, 18 Aug 2021 05:08:28 -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=f37V8GD5ioFKDbYxi3gv593OLz2a3hSDXzr4WHSHW+w=; b=BB0peKOnOiMavfCsFGqKk2di0o5KiGG5X/4fNQ5qwcaGcSl6I7zHIWoADfDTKJCc4t Qmg/jRZl3x2jZvMlcvKIa/eGPtS+2CRK/nVkLCdGEhzh/g4GevjIRqumrUyOYpBveR/M VSXbEg147i1xcaK+N5Dl0l/zVIvwTs9p/3APubc1ujRlxPK5mtNTRRcNPsgemIA7C2N4 9S3UhkgGLkLcauokCWjrd2Y4aC/175Ak8QDIQR9waasxkyd53Al95bMSE+KISo5AJ/WM lW0Uj0/bm7Ev0iSQ8Nx/OHfuqCcbUEUsC7evZgzaqcujkSVtB/J6oiHuWk8/Xow9WhSM Sdkg== 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=f37V8GD5ioFKDbYxi3gv593OLz2a3hSDXzr4WHSHW+w=; b=SOHp4X8K3sb3RLyXJirXyz/K4Jd9ejjzkRcJt2qhVUmgImLmosJzSFZSDoK/mTeN1M EullOpv2QwG3tMw+Mhuzt1ElWO+zUtHD+L6JIWcvI5gHE9tJrU4HlcDly6uF0A4Q9n6I CnEOr3tWMUEEBK4ZNMLzRMDLu/ga7/YajQ2iRBR+Rm33bX0Py1/181qo3vw/O0kWq+PC IdDfAaxS3S3CF/qpxxrNzWnC3eR72QpqsaGFUSCjl6qbUByowMXxYGUYra8B7V9JgIST buPJis+J4ENimdYln7ghgKXTh0L10NoJy0ayNTXvvxTG8KaCwVPMvZfTTgR8+ohtCuY5 TjTQ== X-Gm-Message-State: AOAM533o6XBDO8Y2xlTPpTklU6+B58c5R0BFj7PN+Mp2w5Cd5wtYk3CY KaPpOyVJ0rd0o7orIL5Pe8pf X-Google-Smtp-Source: ABdhPJyUMGwOE1nllSf74VtrxyhqqxAdm9yrHWu9KAmrvLX7oQ+zeFXG5kUh7OtdLbVYS9tzPEvLdQ== X-Received: by 2002:a17:90a:6b42:: with SMTP id x2mr9131506pjl.39.1629288507698; Wed, 18 Aug 2021 05:08:27 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id l185sm5977563pfd.62.2021.08.18.05.08.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:08:27 -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 11/12] vduse: Introduce VDUSE - vDPA Device in Userspace Date: Wed, 18 Aug 2021 20:06:41 +0800 Message-Id: <20210818120642.165-12-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: linux-fsdevel@vger.kernel.org This VDUSE driver enables implementing software-emulated vDPA devices in userspace. The vDPA device is created by ioctl(VDUSE_CREATE_DEV) on /dev/vduse/control. Then a char device interface (/dev/vduse/$NAME) is exported to userspace for device emulation. In order to make the device emulation more secure, the device's control path is handled in kernel. A message mechnism is introduced to forward some dataplane related control messages to userspace. And in the data path, the DMA buffer will be mapped into userspace address space through different ways depending on the vDPA bus to which the vDPA device is attached. In virtio-vdpa case, the MMU-based software IOTLB is used to achieve that. And in vhost-vdpa case, the DMA buffer is reside in a userspace memory region which can be shared to the VDUSE userspace processs via transferring the shmfd. For more details on VDUSE design and usage, please see the follow-on Documentation commit. Signed-off-by: Xie Yongji Acked-by: Jason Wang --- Documentation/userspace-api/ioctl/ioctl-number.rst | 1 + drivers/vdpa/Kconfig | 10 + drivers/vdpa/Makefile | 1 + drivers/vdpa/vdpa_user/Makefile | 5 + drivers/vdpa/vdpa_user/vduse_dev.c | 1611 ++++++++++++++++++++ include/uapi/linux/vduse.h | 304 ++++ 6 files changed, 1932 insertions(+) create mode 100644 drivers/vdpa/vdpa_user/Makefile create mode 100644 drivers/vdpa/vdpa_user/vduse_dev.c create mode 100644 include/uapi/linux/vduse.h diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst index 1409e40e6345..293ca3aef358 100644 --- a/Documentation/userspace-api/ioctl/ioctl-number.rst +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst @@ -300,6 +300,7 @@ Code Seq# Include File Comments 'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict! '|' 00-7F linux/media.h 0x80 00-1F linux/fb.h +0x81 00-1F linux/vduse.h 0x89 00-06 arch/x86/include/asm/sockios.h 0x89 0B-DF linux/sockios.h 0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig index a503c1b2bfd9..6e23bce6433a 100644 --- a/drivers/vdpa/Kconfig +++ b/drivers/vdpa/Kconfig @@ -33,6 +33,16 @@ config VDPA_SIM_BLOCK vDPA block device simulator which terminates IO request in a memory buffer. +config VDPA_USER + tristate "VDUSE (vDPA Device in Userspace) support" + depends on EVENTFD && MMU && HAS_DMA + select DMA_OPS + select VHOST_IOTLB + select IOMMU_IOVA + help + With VDUSE it is possible to emulate a vDPA Device + in a userspace program. + config IFCVF tristate "Intel IFC VF vDPA driver" depends on PCI_MSI diff --git a/drivers/vdpa/Makefile b/drivers/vdpa/Makefile index 67fe7f3d6943..f02ebed33f19 100644 --- a/drivers/vdpa/Makefile +++ b/drivers/vdpa/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_VDPA) += vdpa.o obj-$(CONFIG_VDPA_SIM) += vdpa_sim/ +obj-$(CONFIG_VDPA_USER) += vdpa_user/ obj-$(CONFIG_IFCVF) += ifcvf/ obj-$(CONFIG_MLX5_VDPA) += mlx5/ obj-$(CONFIG_VP_VDPA) += virtio_pci/ diff --git a/drivers/vdpa/vdpa_user/Makefile b/drivers/vdpa/vdpa_user/Makefile new file mode 100644 index 000000000000..260e0b26af99 --- /dev/null +++ b/drivers/vdpa/vdpa_user/Makefile @@ -0,0 +1,5 @@ +# SPDX-License-Identifier: GPL-2.0 + +vduse-y := vduse_dev.o iova_domain.o + +obj-$(CONFIG_VDPA_USER) += vduse.o diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c new file mode 100644 index 000000000000..ce081b7895d5 --- /dev/null +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -0,0 +1,1611 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * VDUSE: vDPA Device in Userspace + * + * Copyright (C) 2020-2021 Bytedance Inc. and/or its affiliates. All rights reserved. + * + * Author: Xie Yongji + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "iova_domain.h" + +#define DRV_AUTHOR "Yongji Xie " +#define DRV_DESC "vDPA Device in Userspace" +#define DRV_LICENSE "GPL v2" + +#define VDUSE_DEV_MAX (1U << MINORBITS) +#define VDUSE_BOUNCE_SIZE (64 * 1024 * 1024) +#define VDUSE_IOVA_SIZE (128 * 1024 * 1024) +#define VDUSE_MSG_DEFAULT_TIMEOUT 30 + +struct vduse_virtqueue { + u16 index; + u16 num_max; + u32 num; + u64 desc_addr; + u64 driver_addr; + u64 device_addr; + struct vdpa_vq_state state; + bool ready; + bool kicked; + spinlock_t kick_lock; + spinlock_t irq_lock; + struct eventfd_ctx *kickfd; + struct vdpa_callback cb; + struct work_struct inject; +}; + +struct vduse_dev; + +struct vduse_vdpa { + struct vdpa_device vdpa; + struct vduse_dev *dev; +}; + +struct vduse_dev { + struct vduse_vdpa *vdev; + struct device *dev; + struct vduse_virtqueue *vqs; + struct vduse_iova_domain *domain; + char *name; + struct mutex lock; + spinlock_t msg_lock; + u64 msg_unique; + u32 msg_timeout; + wait_queue_head_t waitq; + struct list_head send_list; + struct list_head recv_list; + struct vdpa_callback config_cb; + struct work_struct inject; + spinlock_t irq_lock; + int minor; + bool broken; + bool connected; + u64 api_version; + u64 device_features; + u64 driver_features; + u32 device_id; + u32 vendor_id; + u32 generation; + u32 config_size; + void *config; + u8 status; + u32 vq_num; + u32 vq_align; +}; + +struct vduse_dev_msg { + struct vduse_dev_request req; + struct vduse_dev_response resp; + struct list_head list; + wait_queue_head_t waitq; + bool completed; +}; + +struct vduse_control { + u64 api_version; +}; + +static DEFINE_MUTEX(vduse_lock); +static DEFINE_IDR(vduse_idr); + +static dev_t vduse_major; +static struct class *vduse_class; +static struct cdev vduse_ctrl_cdev; +static struct cdev vduse_cdev; +static struct workqueue_struct *vduse_irq_wq; + +static u32 allowed_device_id[] = { + VIRTIO_ID_BLOCK, +}; + +static inline struct vduse_dev *vdpa_to_vduse(struct vdpa_device *vdpa) +{ + struct vduse_vdpa *vdev = container_of(vdpa, struct vduse_vdpa, vdpa); + + return vdev->dev; +} + +static inline struct vduse_dev *dev_to_vduse(struct device *dev) +{ + struct vdpa_device *vdpa = dev_to_vdpa(dev); + + return vdpa_to_vduse(vdpa); +} + +static struct vduse_dev_msg *vduse_find_msg(struct list_head *head, + uint32_t request_id) +{ + struct vduse_dev_msg *msg; + + list_for_each_entry(msg, head, list) { + if (msg->req.request_id == request_id) { + list_del(&msg->list); + return msg; + } + } + + return NULL; +} + +static struct vduse_dev_msg *vduse_dequeue_msg(struct list_head *head) +{ + struct vduse_dev_msg *msg = NULL; + + if (!list_empty(head)) { + msg = list_first_entry(head, struct vduse_dev_msg, list); + list_del(&msg->list); + } + + return msg; +} + +static void vduse_enqueue_msg(struct list_head *head, + struct vduse_dev_msg *msg) +{ + list_add_tail(&msg->list, head); +} + +static void vduse_dev_broken(struct vduse_dev *dev) +{ + struct vduse_dev_msg *msg, *tmp; + + if (unlikely(dev->broken)) + return; + + list_splice_init(&dev->recv_list, &dev->send_list); + list_for_each_entry_safe(msg, tmp, &dev->send_list, list) { + list_del(&msg->list); + msg->completed = 1; + msg->resp.result = VDUSE_REQ_RESULT_FAILED; + wake_up(&msg->waitq); + } + dev->broken = true; + wake_up(&dev->waitq); +} + +static int vduse_dev_msg_sync(struct vduse_dev *dev, + struct vduse_dev_msg *msg) +{ + int ret; + + if (unlikely(dev->broken)) + return -EIO; + + init_waitqueue_head(&msg->waitq); + spin_lock(&dev->msg_lock); + if (unlikely(dev->broken)) { + spin_unlock(&dev->msg_lock); + return -EIO; + } + msg->req.request_id = dev->msg_unique++; + vduse_enqueue_msg(&dev->send_list, msg); + wake_up(&dev->waitq); + spin_unlock(&dev->msg_lock); + if (dev->msg_timeout) + ret = wait_event_killable_timeout(msg->waitq, msg->completed, + (long)dev->msg_timeout * HZ); + else + ret = wait_event_killable(msg->waitq, msg->completed); + + spin_lock(&dev->msg_lock); + if (!msg->completed) { + list_del(&msg->list); + msg->resp.result = VDUSE_REQ_RESULT_FAILED; + /* Mark the device as malfunction when there is a timeout */ + if (!ret) + vduse_dev_broken(dev); + } + ret = (msg->resp.result == VDUSE_REQ_RESULT_OK) ? 0 : -EIO; + spin_unlock(&dev->msg_lock); + + return ret; +} + +static int vduse_dev_get_vq_state_packed(struct vduse_dev *dev, + struct vduse_virtqueue *vq, + struct vdpa_vq_state_packed *packed) +{ + struct vduse_dev_msg msg = { 0 }; + int ret; + + msg.req.type = VDUSE_GET_VQ_STATE; + msg.req.vq_state.index = vq->index; + + ret = vduse_dev_msg_sync(dev, &msg); + if (ret) + return ret; + + packed->last_avail_counter = + msg.resp.vq_state.packed.last_avail_counter & 0x0001; + packed->last_avail_idx = + msg.resp.vq_state.packed.last_avail_idx & 0x7FFF; + packed->last_used_counter = + msg.resp.vq_state.packed.last_used_counter & 0x0001; + packed->last_used_idx = + msg.resp.vq_state.packed.last_used_idx & 0x7FFF; + + return 0; +} + +static int vduse_dev_get_vq_state_split(struct vduse_dev *dev, + struct vduse_virtqueue *vq, + struct vdpa_vq_state_split *split) +{ + struct vduse_dev_msg msg = { 0 }; + int ret; + + msg.req.type = VDUSE_GET_VQ_STATE; + msg.req.vq_state.index = vq->index; + + ret = vduse_dev_msg_sync(dev, &msg); + if (ret) + return ret; + + split->avail_index = msg.resp.vq_state.split.avail_index; + + return 0; +} + +static int vduse_dev_set_status(struct vduse_dev *dev, u8 status) +{ + struct vduse_dev_msg msg = { 0 }; + + msg.req.type = VDUSE_SET_STATUS; + msg.req.s.status = status; + + return vduse_dev_msg_sync(dev, &msg); +} + +static int vduse_dev_update_iotlb(struct vduse_dev *dev, + u64 start, u64 last) +{ + struct vduse_dev_msg msg = { 0 }; + + if (last < start) + return -EINVAL; + + msg.req.type = VDUSE_UPDATE_IOTLB; + msg.req.iova.start = start; + msg.req.iova.last = last; + + return vduse_dev_msg_sync(dev, &msg); +} + +static ssize_t vduse_dev_read_iter(struct kiocb *iocb, struct iov_iter *to) +{ + struct file *file = iocb->ki_filp; + struct vduse_dev *dev = file->private_data; + struct vduse_dev_msg *msg; + int size = sizeof(struct vduse_dev_request); + ssize_t ret; + + if (iov_iter_count(to) < size) + return -EINVAL; + + spin_lock(&dev->msg_lock); + while (1) { + msg = vduse_dequeue_msg(&dev->send_list); + if (msg) + break; + + ret = -EAGAIN; + if (file->f_flags & O_NONBLOCK) + goto unlock; + + spin_unlock(&dev->msg_lock); + ret = wait_event_interruptible_exclusive(dev->waitq, + !list_empty(&dev->send_list)); + if (ret) + return ret; + + spin_lock(&dev->msg_lock); + } + spin_unlock(&dev->msg_lock); + ret = copy_to_iter(&msg->req, size, to); + spin_lock(&dev->msg_lock); + if (ret != size) { + ret = -EFAULT; + vduse_enqueue_msg(&dev->send_list, msg); + goto unlock; + } + vduse_enqueue_msg(&dev->recv_list, msg); +unlock: + spin_unlock(&dev->msg_lock); + + return ret; +} + +static bool is_mem_zero(const char *ptr, int size) +{ + int i; + + for (i = 0; i < size; i++) { + if (ptr[i]) + return false; + } + return true; +} + +static ssize_t vduse_dev_write_iter(struct kiocb *iocb, struct iov_iter *from) +{ + struct file *file = iocb->ki_filp; + struct vduse_dev *dev = file->private_data; + struct vduse_dev_response resp; + struct vduse_dev_msg *msg; + size_t ret; + + ret = copy_from_iter(&resp, sizeof(resp), from); + if (ret != sizeof(resp)) + return -EINVAL; + + if (!is_mem_zero((const char *)resp.reserved, sizeof(resp.reserved))) + return -EINVAL; + + spin_lock(&dev->msg_lock); + msg = vduse_find_msg(&dev->recv_list, resp.request_id); + if (!msg) { + ret = -ENOENT; + goto unlock; + } + + memcpy(&msg->resp, &resp, sizeof(resp)); + msg->completed = 1; + wake_up(&msg->waitq); +unlock: + spin_unlock(&dev->msg_lock); + + return ret; +} + +static __poll_t vduse_dev_poll(struct file *file, poll_table *wait) +{ + struct vduse_dev *dev = file->private_data; + __poll_t mask = 0; + + poll_wait(file, &dev->waitq, wait); + + spin_lock(&dev->msg_lock); + + if (unlikely(dev->broken)) + mask |= EPOLLERR; + if (!list_empty(&dev->send_list)) + mask |= EPOLLIN | EPOLLRDNORM; + if (!list_empty(&dev->recv_list)) + mask |= EPOLLOUT | EPOLLWRNORM; + + spin_unlock(&dev->msg_lock); + + return mask; +} + +static void vduse_dev_reset(struct vduse_dev *dev) +{ + int i; + struct vduse_iova_domain *domain = dev->domain; + + /* The coherent mappings are handled in vduse_dev_free_coherent() */ + if (domain->bounce_map) + vduse_domain_reset_bounce_map(domain); + + dev->status = 0; + dev->driver_features = 0; + dev->generation++; + spin_lock(&dev->irq_lock); + dev->config_cb.callback = NULL; + dev->config_cb.private = NULL; + spin_unlock(&dev->irq_lock); + flush_work(&dev->inject); + + for (i = 0; i < dev->vq_num; i++) { + struct vduse_virtqueue *vq = &dev->vqs[i]; + + vq->ready = false; + vq->desc_addr = 0; + vq->driver_addr = 0; + vq->device_addr = 0; + vq->num = 0; + memset(&vq->state, 0, sizeof(vq->state)); + + spin_lock(&vq->kick_lock); + vq->kicked = false; + if (vq->kickfd) + eventfd_ctx_put(vq->kickfd); + vq->kickfd = NULL; + spin_unlock(&vq->kick_lock); + + spin_lock(&vq->irq_lock); + vq->cb.callback = NULL; + vq->cb.private = NULL; + spin_unlock(&vq->irq_lock); + flush_work(&vq->inject); + } +} + +static int vduse_vdpa_set_vq_address(struct vdpa_device *vdpa, u16 idx, + u64 desc_area, u64 driver_area, + u64 device_area) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + struct vduse_virtqueue *vq = &dev->vqs[idx]; + + vq->desc_addr = desc_area; + vq->driver_addr = driver_area; + vq->device_addr = device_area; + + return 0; +} + +static void vduse_vdpa_kick_vq(struct vdpa_device *vdpa, u16 idx) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + struct vduse_virtqueue *vq = &dev->vqs[idx]; + + spin_lock(&vq->kick_lock); + if (!vq->ready) + goto unlock; + + if (vq->kickfd) + eventfd_signal(vq->kickfd, 1); + else + vq->kicked = true; +unlock: + spin_unlock(&vq->kick_lock); +} + +static void vduse_vdpa_set_vq_cb(struct vdpa_device *vdpa, u16 idx, + struct vdpa_callback *cb) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + struct vduse_virtqueue *vq = &dev->vqs[idx]; + + spin_lock(&vq->irq_lock); + vq->cb.callback = cb->callback; + vq->cb.private = cb->private; + spin_unlock(&vq->irq_lock); +} + +static void vduse_vdpa_set_vq_num(struct vdpa_device *vdpa, u16 idx, u32 num) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + struct vduse_virtqueue *vq = &dev->vqs[idx]; + + vq->num = num; +} + +static void vduse_vdpa_set_vq_ready(struct vdpa_device *vdpa, + u16 idx, bool ready) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + struct vduse_virtqueue *vq = &dev->vqs[idx]; + + vq->ready = ready; +} + +static bool vduse_vdpa_get_vq_ready(struct vdpa_device *vdpa, u16 idx) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + struct vduse_virtqueue *vq = &dev->vqs[idx]; + + return vq->ready; +} + +static int vduse_vdpa_set_vq_state(struct vdpa_device *vdpa, u16 idx, + const struct vdpa_vq_state *state) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + struct vduse_virtqueue *vq = &dev->vqs[idx]; + + if (dev->driver_features & BIT_ULL(VIRTIO_F_RING_PACKED)) { + vq->state.packed.last_avail_counter = + state->packed.last_avail_counter; + vq->state.packed.last_avail_idx = state->packed.last_avail_idx; + vq->state.packed.last_used_counter = + state->packed.last_used_counter; + vq->state.packed.last_used_idx = state->packed.last_used_idx; + } else + vq->state.split.avail_index = state->split.avail_index; + + return 0; +} + +static int vduse_vdpa_get_vq_state(struct vdpa_device *vdpa, u16 idx, + struct vdpa_vq_state *state) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + struct vduse_virtqueue *vq = &dev->vqs[idx]; + + if (dev->driver_features & BIT_ULL(VIRTIO_F_RING_PACKED)) + return vduse_dev_get_vq_state_packed(dev, vq, &state->packed); + + return vduse_dev_get_vq_state_split(dev, vq, &state->split); +} + +static u32 vduse_vdpa_get_vq_align(struct vdpa_device *vdpa) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + return dev->vq_align; +} + +static u64 vduse_vdpa_get_features(struct vdpa_device *vdpa) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + return dev->device_features; +} + +static int vduse_vdpa_set_features(struct vdpa_device *vdpa, u64 features) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + dev->driver_features = features; + return 0; +} + +static void vduse_vdpa_set_config_cb(struct vdpa_device *vdpa, + struct vdpa_callback *cb) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + spin_lock(&dev->irq_lock); + dev->config_cb.callback = cb->callback; + dev->config_cb.private = cb->private; + spin_unlock(&dev->irq_lock); +} + +static u16 vduse_vdpa_get_vq_num_max(struct vdpa_device *vdpa, u16 idx) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + return dev->vqs[idx].num_max; +} + +static u32 vduse_vdpa_get_device_id(struct vdpa_device *vdpa) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + return dev->device_id; +} + +static u32 vduse_vdpa_get_vendor_id(struct vdpa_device *vdpa) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + return dev->vendor_id; +} + +static u8 vduse_vdpa_get_status(struct vdpa_device *vdpa) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + return dev->status; +} + +static void vduse_vdpa_set_status(struct vdpa_device *vdpa, u8 status) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + if (vduse_dev_set_status(dev, status)) + return; + + dev->status = status; +} + +static size_t vduse_vdpa_get_config_size(struct vdpa_device *vdpa) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + return dev->config_size; +} + +static void vduse_vdpa_get_config(struct vdpa_device *vdpa, unsigned int offset, + void *buf, unsigned int len) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + if (len > dev->config_size - offset) + return; + + memcpy(buf, dev->config + offset, len); +} + +static void vduse_vdpa_set_config(struct vdpa_device *vdpa, unsigned int offset, + const void *buf, unsigned int len) +{ + /* Now we only support read-only configuration space */ +} + +static int vduse_vdpa_reset(struct vdpa_device *vdpa) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + if (vduse_dev_set_status(dev, 0)) + return -EIO; + + vduse_dev_reset(dev); + + return 0; +} + +static u32 vduse_vdpa_get_generation(struct vdpa_device *vdpa) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + return dev->generation; +} + +static int vduse_vdpa_set_map(struct vdpa_device *vdpa, + struct vhost_iotlb *iotlb) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + int ret; + + ret = vduse_domain_set_map(dev->domain, iotlb); + if (ret) + return ret; + + ret = vduse_dev_update_iotlb(dev, 0ULL, ULLONG_MAX); + if (ret) { + vduse_domain_clear_map(dev->domain, iotlb); + return ret; + } + + return 0; +} + +static void vduse_vdpa_free(struct vdpa_device *vdpa) +{ + struct vduse_dev *dev = vdpa_to_vduse(vdpa); + + dev->vdev = NULL; +} + +static const struct vdpa_config_ops vduse_vdpa_config_ops = { + .set_vq_address = vduse_vdpa_set_vq_address, + .kick_vq = vduse_vdpa_kick_vq, + .set_vq_cb = vduse_vdpa_set_vq_cb, + .set_vq_num = vduse_vdpa_set_vq_num, + .set_vq_ready = vduse_vdpa_set_vq_ready, + .get_vq_ready = vduse_vdpa_get_vq_ready, + .set_vq_state = vduse_vdpa_set_vq_state, + .get_vq_state = vduse_vdpa_get_vq_state, + .get_vq_align = vduse_vdpa_get_vq_align, + .get_features = vduse_vdpa_get_features, + .set_features = vduse_vdpa_set_features, + .set_config_cb = vduse_vdpa_set_config_cb, + .get_vq_num_max = vduse_vdpa_get_vq_num_max, + .get_device_id = vduse_vdpa_get_device_id, + .get_vendor_id = vduse_vdpa_get_vendor_id, + .get_status = vduse_vdpa_get_status, + .set_status = vduse_vdpa_set_status, + .get_config_size = vduse_vdpa_get_config_size, + .get_config = vduse_vdpa_get_config, + .set_config = vduse_vdpa_set_config, + .get_generation = vduse_vdpa_get_generation, + .reset = vduse_vdpa_reset, + .set_map = vduse_vdpa_set_map, + .free = vduse_vdpa_free, +}; + +static dma_addr_t vduse_dev_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, + unsigned long attrs) +{ + struct vduse_dev *vdev = dev_to_vduse(dev); + struct vduse_iova_domain *domain = vdev->domain; + + return vduse_domain_map_page(domain, page, offset, size, dir, attrs); +} + +static void vduse_dev_unmap_page(struct device *dev, dma_addr_t dma_addr, + size_t size, enum dma_data_direction dir, + unsigned long attrs) +{ + struct vduse_dev *vdev = dev_to_vduse(dev); + struct vduse_iova_domain *domain = vdev->domain; + + return vduse_domain_unmap_page(domain, dma_addr, size, dir, attrs); +} + +static void *vduse_dev_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_addr, gfp_t flag, + unsigned long attrs) +{ + struct vduse_dev *vdev = dev_to_vduse(dev); + struct vduse_iova_domain *domain = vdev->domain; + unsigned long iova; + void *addr; + + *dma_addr = DMA_MAPPING_ERROR; + addr = vduse_domain_alloc_coherent(domain, size, + (dma_addr_t *)&iova, flag, attrs); + if (!addr) + return NULL; + + *dma_addr = (dma_addr_t)iova; + + return addr; +} + +static void vduse_dev_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_addr, + unsigned long attrs) +{ + struct vduse_dev *vdev = dev_to_vduse(dev); + struct vduse_iova_domain *domain = vdev->domain; + + vduse_domain_free_coherent(domain, size, vaddr, dma_addr, attrs); +} + +static size_t vduse_dev_max_mapping_size(struct device *dev) +{ + struct vduse_dev *vdev = dev_to_vduse(dev); + struct vduse_iova_domain *domain = vdev->domain; + + return domain->bounce_size; +} + +static const struct dma_map_ops vduse_dev_dma_ops = { + .map_page = vduse_dev_map_page, + .unmap_page = vduse_dev_unmap_page, + .alloc = vduse_dev_alloc_coherent, + .free = vduse_dev_free_coherent, + .max_mapping_size = vduse_dev_max_mapping_size, +}; + +static unsigned int perm_to_file_flags(u8 perm) +{ + unsigned int flags = 0; + + switch (perm) { + case VDUSE_ACCESS_WO: + flags |= O_WRONLY; + break; + case VDUSE_ACCESS_RO: + flags |= O_RDONLY; + break; + case VDUSE_ACCESS_RW: + flags |= O_RDWR; + break; + default: + WARN(1, "invalidate vhost IOTLB permission\n"); + break; + } + + return flags; +} + +static int vduse_kickfd_setup(struct vduse_dev *dev, + struct vduse_vq_eventfd *eventfd) +{ + struct eventfd_ctx *ctx = NULL; + struct vduse_virtqueue *vq; + u32 index; + + if (eventfd->index >= dev->vq_num) + return -EINVAL; + + index = array_index_nospec(eventfd->index, dev->vq_num); + vq = &dev->vqs[index]; + if (eventfd->fd >= 0) { + ctx = eventfd_ctx_fdget(eventfd->fd); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + } else if (eventfd->fd != VDUSE_EVENTFD_DEASSIGN) + return 0; + + spin_lock(&vq->kick_lock); + if (vq->kickfd) + eventfd_ctx_put(vq->kickfd); + vq->kickfd = ctx; + if (vq->ready && vq->kicked && vq->kickfd) { + eventfd_signal(vq->kickfd, 1); + vq->kicked = false; + } + spin_unlock(&vq->kick_lock); + + return 0; +} + +static bool vduse_dev_is_ready(struct vduse_dev *dev) +{ + int i; + + for (i = 0; i < dev->vq_num; i++) + if (!dev->vqs[i].num_max) + return false; + + return true; +} + +static void vduse_dev_irq_inject(struct work_struct *work) +{ + struct vduse_dev *dev = container_of(work, struct vduse_dev, inject); + + spin_lock_irq(&dev->irq_lock); + if (dev->config_cb.callback) + dev->config_cb.callback(dev->config_cb.private); + spin_unlock_irq(&dev->irq_lock); +} + +static void vduse_vq_irq_inject(struct work_struct *work) +{ + struct vduse_virtqueue *vq = container_of(work, + struct vduse_virtqueue, inject); + + spin_lock_irq(&vq->irq_lock); + if (vq->ready && vq->cb.callback) + vq->cb.callback(vq->cb.private); + spin_unlock_irq(&vq->irq_lock); +} + +static long vduse_dev_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct vduse_dev *dev = file->private_data; + void __user *argp = (void __user *)arg; + int ret; + + if (unlikely(dev->broken)) + return -EPERM; + + switch (cmd) { + case VDUSE_IOTLB_GET_FD: { + struct vduse_iotlb_entry entry; + struct vhost_iotlb_map *map; + struct vdpa_map_file *map_file; + struct vduse_iova_domain *domain = dev->domain; + struct file *f = NULL; + + ret = -EFAULT; + if (copy_from_user(&entry, argp, sizeof(entry))) + break; + + ret = -EINVAL; + if (entry.start > entry.last) + break; + + spin_lock(&domain->iotlb_lock); + map = vhost_iotlb_itree_first(domain->iotlb, + entry.start, entry.last); + if (map) { + map_file = (struct vdpa_map_file *)map->opaque; + f = get_file(map_file->file); + entry.offset = map_file->offset; + entry.start = map->start; + entry.last = map->last; + entry.perm = map->perm; + } + spin_unlock(&domain->iotlb_lock); + ret = -EINVAL; + if (!f) + break; + + ret = -EFAULT; + if (copy_to_user(argp, &entry, sizeof(entry))) { + fput(f); + break; + } + ret = receive_fd(f, perm_to_file_flags(entry.perm)); + fput(f); + break; + } + case VDUSE_DEV_GET_FEATURES: + /* + * Just mirror what driver wrote here. + * The driver is expected to check FEATURE_OK later. + */ + ret = put_user(dev->driver_features, (u64 __user *)argp); + break; + case VDUSE_DEV_SET_CONFIG: { + struct vduse_config_data config; + unsigned long size = offsetof(struct vduse_config_data, + buffer); + + ret = -EFAULT; + if (copy_from_user(&config, argp, size)) + break; + + ret = -EINVAL; + if (config.length == 0 || + config.length > dev->config_size - config.offset) + break; + + ret = -EFAULT; + if (copy_from_user(dev->config + config.offset, argp + size, + config.length)) + break; + + ret = 0; + break; + } + case VDUSE_DEV_INJECT_CONFIG_IRQ: + ret = 0; + queue_work(vduse_irq_wq, &dev->inject); + break; + case VDUSE_VQ_SETUP: { + struct vduse_vq_config config; + u32 index; + + ret = -EFAULT; + if (copy_from_user(&config, argp, sizeof(config))) + break; + + ret = -EINVAL; + if (config.index >= dev->vq_num) + break; + + index = array_index_nospec(config.index, dev->vq_num); + dev->vqs[index].num_max = config.max_size; + ret = 0; + break; + } + case VDUSE_VQ_GET_INFO: { + struct vduse_vq_info vq_info; + struct vduse_virtqueue *vq; + u32 index; + + ret = -EFAULT; + if (copy_from_user(&vq_info, argp, sizeof(vq_info))) + break; + + ret = -EINVAL; + if (vq_info.index >= dev->vq_num) + break; + + index = array_index_nospec(vq_info.index, dev->vq_num); + vq = &dev->vqs[index]; + vq_info.desc_addr = vq->desc_addr; + vq_info.driver_addr = vq->driver_addr; + vq_info.device_addr = vq->device_addr; + vq_info.num = vq->num; + + if (dev->driver_features & BIT_ULL(VIRTIO_F_RING_PACKED)) { + vq_info.packed.last_avail_counter = + vq->state.packed.last_avail_counter; + vq_info.packed.last_avail_idx = + vq->state.packed.last_avail_idx; + vq_info.packed.last_used_counter = + vq->state.packed.last_used_counter; + vq_info.packed.last_used_idx = + vq->state.packed.last_used_idx; + } else + vq_info.split.avail_index = + vq->state.split.avail_index; + + vq_info.ready = vq->ready; + + ret = -EFAULT; + if (copy_to_user(argp, &vq_info, sizeof(vq_info))) + break; + + ret = 0; + break; + } + case VDUSE_VQ_SETUP_KICKFD: { + struct vduse_vq_eventfd eventfd; + + ret = -EFAULT; + if (copy_from_user(&eventfd, argp, sizeof(eventfd))) + break; + + ret = vduse_kickfd_setup(dev, &eventfd); + break; + } + case VDUSE_VQ_INJECT_IRQ: { + u32 index; + + ret = -EFAULT; + if (get_user(index, (u32 __user *)argp)) + break; + + ret = -EINVAL; + if (index >= dev->vq_num) + break; + + ret = 0; + index = array_index_nospec(index, dev->vq_num); + queue_work(vduse_irq_wq, &dev->vqs[index].inject); + break; + } + default: + ret = -ENOIOCTLCMD; + break; + } + + return ret; +} + +static int vduse_dev_release(struct inode *inode, struct file *file) +{ + struct vduse_dev *dev = file->private_data; + + spin_lock(&dev->msg_lock); + /* Make sure the inflight messages can processed after reconncection */ + list_splice_init(&dev->recv_list, &dev->send_list); + spin_unlock(&dev->msg_lock); + dev->connected = false; + + return 0; +} + +static struct vduse_dev *vduse_dev_get_from_minor(int minor) +{ + struct vduse_dev *dev; + + mutex_lock(&vduse_lock); + dev = idr_find(&vduse_idr, minor); + mutex_unlock(&vduse_lock); + + return dev; +} + +static int vduse_dev_open(struct inode *inode, struct file *file) +{ + int ret; + struct vduse_dev *dev = vduse_dev_get_from_minor(iminor(inode)); + + if (!dev) + return -ENODEV; + + ret = -EBUSY; + mutex_lock(&dev->lock); + if (dev->connected) + goto unlock; + + ret = 0; + dev->connected = true; + file->private_data = dev; +unlock: + mutex_unlock(&dev->lock); + + return ret; +} + +static const struct file_operations vduse_dev_fops = { + .owner = THIS_MODULE, + .open = vduse_dev_open, + .release = vduse_dev_release, + .read_iter = vduse_dev_read_iter, + .write_iter = vduse_dev_write_iter, + .poll = vduse_dev_poll, + .unlocked_ioctl = vduse_dev_ioctl, + .compat_ioctl = compat_ptr_ioctl, + .llseek = noop_llseek, +}; + +static struct vduse_dev *vduse_dev_create(void) +{ + struct vduse_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL); + + if (!dev) + return NULL; + + mutex_init(&dev->lock); + spin_lock_init(&dev->msg_lock); + INIT_LIST_HEAD(&dev->send_list); + INIT_LIST_HEAD(&dev->recv_list); + spin_lock_init(&dev->irq_lock); + + INIT_WORK(&dev->inject, vduse_dev_irq_inject); + init_waitqueue_head(&dev->waitq); + + return dev; +} + +static void vduse_dev_destroy(struct vduse_dev *dev) +{ + kfree(dev); +} + +static struct vduse_dev *vduse_find_dev(const char *name) +{ + struct vduse_dev *dev; + int id; + + idr_for_each_entry(&vduse_idr, dev, id) + if (!strcmp(dev->name, name)) + return dev; + + return NULL; +} + +static int vduse_destroy_dev(char *name) +{ + struct vduse_dev *dev = vduse_find_dev(name); + + if (!dev) + return -EINVAL; + + mutex_lock(&dev->lock); + if (dev->vdev || dev->connected) { + mutex_unlock(&dev->lock); + return -EBUSY; + } + dev->connected = true; + mutex_unlock(&dev->lock); + + vduse_dev_reset(dev); + device_destroy(vduse_class, MKDEV(MAJOR(vduse_major), dev->minor)); + idr_remove(&vduse_idr, dev->minor); + kvfree(dev->config); + kfree(dev->vqs); + vduse_domain_destroy(dev->domain); + kfree(dev->name); + vduse_dev_destroy(dev); + module_put(THIS_MODULE); + + return 0; +} + +static bool device_is_allowed(u32 device_id) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(allowed_device_id); i++) + if (allowed_device_id[i] == device_id) + return true; + + return false; +} + +static bool features_is_valid(u64 features) +{ + if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM))) + return false; + + /* Now we only support read-only configuration space */ + if (features & (1ULL << VIRTIO_BLK_F_CONFIG_WCE)) + return false; + + return true; +} + +static bool vduse_validate_config(struct vduse_dev_config *config) +{ + if (!is_mem_zero((const char *)config->reserved, + sizeof(config->reserved))) + return false; + + if (config->vq_align > PAGE_SIZE) + return false; + + if (config->config_size > PAGE_SIZE) + return false; + + if (!device_is_allowed(config->device_id)) + return false; + + if (!features_is_valid(config->features)) + return false; + + return true; +} + +static ssize_t msg_timeout_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct vduse_dev *dev = dev_get_drvdata(device); + + return sysfs_emit(buf, "%u\n", dev->msg_timeout); +} + +static ssize_t msg_timeout_store(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct vduse_dev *dev = dev_get_drvdata(device); + int ret; + + ret = kstrtouint(buf, 10, &dev->msg_timeout); + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR_RW(msg_timeout); + +static struct attribute *vduse_dev_attrs[] = { + &dev_attr_msg_timeout.attr, + NULL +}; + +ATTRIBUTE_GROUPS(vduse_dev); + +static int vduse_create_dev(struct vduse_dev_config *config, + void *config_buf, u64 api_version) +{ + int i, ret; + struct vduse_dev *dev; + + ret = -EEXIST; + if (vduse_find_dev(config->name)) + goto err; + + ret = -ENOMEM; + dev = vduse_dev_create(); + if (!dev) + goto err; + + dev->api_version = api_version; + dev->device_features = config->features; + dev->device_id = config->device_id; + dev->vendor_id = config->vendor_id; + dev->name = kstrdup(config->name, GFP_KERNEL); + if (!dev->name) + goto err_str; + + dev->domain = vduse_domain_create(VDUSE_IOVA_SIZE - 1, + VDUSE_BOUNCE_SIZE); + if (!dev->domain) + goto err_domain; + + dev->config = config_buf; + dev->config_size = config->config_size; + dev->vq_align = config->vq_align; + dev->vq_num = config->vq_num; + dev->vqs = kcalloc(dev->vq_num, sizeof(*dev->vqs), GFP_KERNEL); + if (!dev->vqs) + goto err_vqs; + + for (i = 0; i < dev->vq_num; i++) { + dev->vqs[i].index = i; + INIT_WORK(&dev->vqs[i].inject, vduse_vq_irq_inject); + spin_lock_init(&dev->vqs[i].kick_lock); + spin_lock_init(&dev->vqs[i].irq_lock); + } + + ret = idr_alloc(&vduse_idr, dev, 1, VDUSE_DEV_MAX, GFP_KERNEL); + if (ret < 0) + goto err_idr; + + dev->minor = ret; + dev->msg_timeout = VDUSE_MSG_DEFAULT_TIMEOUT; + dev->dev = device_create(vduse_class, NULL, + MKDEV(MAJOR(vduse_major), dev->minor), + dev, "%s", config->name); + if (IS_ERR(dev->dev)) { + ret = PTR_ERR(dev->dev); + goto err_dev; + } + __module_get(THIS_MODULE); + + return 0; +err_dev: + idr_remove(&vduse_idr, dev->minor); +err_idr: + kfree(dev->vqs); +err_vqs: + vduse_domain_destroy(dev->domain); +err_domain: + kfree(dev->name); +err_str: + vduse_dev_destroy(dev); +err: + kvfree(config_buf); + return ret; +} + +static long vduse_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + int ret; + void __user *argp = (void __user *)arg; + struct vduse_control *control = file->private_data; + + mutex_lock(&vduse_lock); + switch (cmd) { + case VDUSE_GET_API_VERSION: + ret = put_user(control->api_version, (u64 __user *)argp); + break; + case VDUSE_SET_API_VERSION: { + u64 api_version; + + ret = -EFAULT; + if (get_user(api_version, (u64 __user *)argp)) + break; + + ret = -EINVAL; + if (api_version > VDUSE_API_VERSION) + break; + + ret = 0; + control->api_version = api_version; + break; + } + case VDUSE_CREATE_DEV: { + struct vduse_dev_config config; + unsigned long size = offsetof(struct vduse_dev_config, config); + void *buf; + + ret = -EFAULT; + if (copy_from_user(&config, argp, size)) + break; + + ret = -EINVAL; + if (vduse_validate_config(&config) == false) + break; + + buf = vmemdup_user(argp + size, config.config_size); + if (IS_ERR(buf)) { + ret = PTR_ERR(buf); + break; + } + config.name[VDUSE_NAME_MAX - 1] = '\0'; + ret = vduse_create_dev(&config, buf, control->api_version); + break; + } + case VDUSE_DESTROY_DEV: { + char name[VDUSE_NAME_MAX]; + + ret = -EFAULT; + if (copy_from_user(name, argp, VDUSE_NAME_MAX)) + break; + + name[VDUSE_NAME_MAX - 1] = '\0'; + ret = vduse_destroy_dev(name); + break; + } + default: + ret = -EINVAL; + break; + } + mutex_unlock(&vduse_lock); + + return ret; +} + +static int vduse_release(struct inode *inode, struct file *file) +{ + struct vduse_control *control = file->private_data; + + kfree(control); + return 0; +} + +static int vduse_open(struct inode *inode, struct file *file) +{ + struct vduse_control *control; + + control = kmalloc(sizeof(struct vduse_control), GFP_KERNEL); + if (!control) + return -ENOMEM; + + control->api_version = VDUSE_API_VERSION; + file->private_data = control; + + return 0; +} + +static const struct file_operations vduse_ctrl_fops = { + .owner = THIS_MODULE, + .open = vduse_open, + .release = vduse_release, + .unlocked_ioctl = vduse_ioctl, + .compat_ioctl = compat_ptr_ioctl, + .llseek = noop_llseek, +}; + +static char *vduse_devnode(struct device *dev, umode_t *mode) +{ + return kasprintf(GFP_KERNEL, "vduse/%s", dev_name(dev)); +} + +static void vduse_mgmtdev_release(struct device *dev) +{ +} + +static struct device vduse_mgmtdev = { + .init_name = "vduse", + .release = vduse_mgmtdev_release, +}; + +static struct vdpa_mgmt_dev mgmt_dev; + +static int vduse_dev_init_vdpa(struct vduse_dev *dev, const char *name) +{ + struct vduse_vdpa *vdev; + int ret; + + if (dev->vdev) + return -EEXIST; + + vdev = vdpa_alloc_device(struct vduse_vdpa, vdpa, dev->dev, + &vduse_vdpa_config_ops, name, true); + if (IS_ERR(vdev)) + return PTR_ERR(vdev); + + dev->vdev = vdev; + vdev->dev = dev; + vdev->vdpa.dev.dma_mask = &vdev->vdpa.dev.coherent_dma_mask; + ret = dma_set_mask_and_coherent(&vdev->vdpa.dev, DMA_BIT_MASK(64)); + if (ret) { + put_device(&vdev->vdpa.dev); + return ret; + } + set_dma_ops(&vdev->vdpa.dev, &vduse_dev_dma_ops); + vdev->vdpa.dma_dev = &vdev->vdpa.dev; + vdev->vdpa.mdev = &mgmt_dev; + + return 0; +} + +static int vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name) +{ + struct vduse_dev *dev; + int ret; + + mutex_lock(&vduse_lock); + dev = vduse_find_dev(name); + if (!dev || !vduse_dev_is_ready(dev)) { + mutex_unlock(&vduse_lock); + return -EINVAL; + } + ret = vduse_dev_init_vdpa(dev, name); + mutex_unlock(&vduse_lock); + if (ret) + return ret; + + ret = _vdpa_register_device(&dev->vdev->vdpa, dev->vq_num); + if (ret) { + put_device(&dev->vdev->vdpa.dev); + return ret; + } + + return 0; +} + +static void vdpa_dev_del(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev) +{ + _vdpa_unregister_device(dev); +} + +static const struct vdpa_mgmtdev_ops vdpa_dev_mgmtdev_ops = { + .dev_add = vdpa_dev_add, + .dev_del = vdpa_dev_del, +}; + +static struct virtio_device_id id_table[] = { + { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID }, + { 0 }, +}; + +static struct vdpa_mgmt_dev mgmt_dev = { + .device = &vduse_mgmtdev, + .id_table = id_table, + .ops = &vdpa_dev_mgmtdev_ops, +}; + +static int vduse_mgmtdev_init(void) +{ + int ret; + + ret = device_register(&vduse_mgmtdev); + if (ret) + return ret; + + ret = vdpa_mgmtdev_register(&mgmt_dev); + if (ret) + goto err; + + return 0; +err: + device_unregister(&vduse_mgmtdev); + return ret; +} + +static void vduse_mgmtdev_exit(void) +{ + vdpa_mgmtdev_unregister(&mgmt_dev); + device_unregister(&vduse_mgmtdev); +} + +static int vduse_init(void) +{ + int ret; + struct device *dev; + + vduse_class = class_create(THIS_MODULE, "vduse"); + if (IS_ERR(vduse_class)) + return PTR_ERR(vduse_class); + + vduse_class->devnode = vduse_devnode; + vduse_class->dev_groups = vduse_dev_groups; + + ret = alloc_chrdev_region(&vduse_major, 0, VDUSE_DEV_MAX, "vduse"); + if (ret) + goto err_chardev_region; + + /* /dev/vduse/control */ + cdev_init(&vduse_ctrl_cdev, &vduse_ctrl_fops); + vduse_ctrl_cdev.owner = THIS_MODULE; + ret = cdev_add(&vduse_ctrl_cdev, vduse_major, 1); + if (ret) + goto err_ctrl_cdev; + + dev = device_create(vduse_class, NULL, vduse_major, NULL, "control"); + if (IS_ERR(dev)) { + ret = PTR_ERR(dev); + goto err_device; + } + + /* /dev/vduse/$DEVICE */ + cdev_init(&vduse_cdev, &vduse_dev_fops); + vduse_cdev.owner = THIS_MODULE; + ret = cdev_add(&vduse_cdev, MKDEV(MAJOR(vduse_major), 1), + VDUSE_DEV_MAX - 1); + if (ret) + goto err_cdev; + + vduse_irq_wq = alloc_workqueue("vduse-irq", + WQ_HIGHPRI | WQ_SYSFS | WQ_UNBOUND, 0); + if (!vduse_irq_wq) + goto err_wq; + + ret = vduse_domain_init(); + if (ret) + goto err_domain; + + ret = vduse_mgmtdev_init(); + if (ret) + goto err_mgmtdev; + + return 0; +err_mgmtdev: + vduse_domain_exit(); +err_domain: + destroy_workqueue(vduse_irq_wq); +err_wq: + cdev_del(&vduse_cdev); +err_cdev: + device_destroy(vduse_class, vduse_major); +err_device: + cdev_del(&vduse_ctrl_cdev); +err_ctrl_cdev: + unregister_chrdev_region(vduse_major, VDUSE_DEV_MAX); +err_chardev_region: + class_destroy(vduse_class); + return ret; +} +module_init(vduse_init); + +static void vduse_exit(void) +{ + vduse_mgmtdev_exit(); + vduse_domain_exit(); + destroy_workqueue(vduse_irq_wq); + cdev_del(&vduse_cdev); + device_destroy(vduse_class, vduse_major); + cdev_del(&vduse_ctrl_cdev); + unregister_chrdev_region(vduse_major, VDUSE_DEV_MAX); + class_destroy(vduse_class); +} +module_exit(vduse_exit); + +MODULE_LICENSE(DRV_LICENSE); +MODULE_AUTHOR(DRV_AUTHOR); +MODULE_DESCRIPTION(DRV_DESC); diff --git a/include/uapi/linux/vduse.h b/include/uapi/linux/vduse.h new file mode 100644 index 000000000000..2e885824fd49 --- /dev/null +++ b/include/uapi/linux/vduse.h @@ -0,0 +1,304 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _UAPI_VDUSE_H_ +#define _UAPI_VDUSE_H_ + +#include + +#define VDUSE_BASE 0x81 + +/* The ioctls for control device (/dev/vduse/control) */ + +#define VDUSE_API_VERSION 0 + +/* + * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION). + * This is used for future extension. + */ +#define VDUSE_GET_API_VERSION _IOR(VDUSE_BASE, 0x00, __u64) + +/* Set the version of VDUSE API that userspace supported. */ +#define VDUSE_SET_API_VERSION _IOW(VDUSE_BASE, 0x01, __u64) + +/** + * struct vduse_dev_config - basic configuration of a VDUSE device + * @name: VDUSE device name, needs to be NUL terminated + * @vendor_id: virtio vendor id + * @device_id: virtio device id + * @features: virtio features + * @vq_num: the number of virtqueues + * @vq_align: the allocation alignment of virtqueue's metadata + * @reserved: for future use, needs to be initialized to zero + * @config_size: the size of the configuration space + * @config: the buffer of the configuration space + * + * Structure used by VDUSE_CREATE_DEV ioctl to create VDUSE device. + */ +struct vduse_dev_config { +#define VDUSE_NAME_MAX 256 + char name[VDUSE_NAME_MAX]; + __u32 vendor_id; + __u32 device_id; + __u64 features; + __u32 vq_num; + __u32 vq_align; + __u32 reserved[13]; + __u32 config_size; + __u8 config[]; +}; + +/* Create a VDUSE device which is represented by a char device (/dev/vduse/$NAME) */ +#define VDUSE_CREATE_DEV _IOW(VDUSE_BASE, 0x02, struct vduse_dev_config) + +/* + * Destroy a VDUSE device. Make sure there are no more references + * to the char device (/dev/vduse/$NAME). + */ +#define VDUSE_DESTROY_DEV _IOW(VDUSE_BASE, 0x03, char[VDUSE_NAME_MAX]) + +/* The ioctls for VDUSE device (/dev/vduse/$NAME) */ + +/** + * struct vduse_iotlb_entry - entry of IOTLB to describe one IOVA region [start, last] + * @offset: the mmap offset on returned file descriptor + * @start: start of the IOVA region + * @last: last of the IOVA region + * @perm: access permission of the IOVA region + * + * Structure used by VDUSE_IOTLB_GET_FD ioctl to find an overlapped IOVA region. + */ +struct vduse_iotlb_entry { + __u64 offset; + __u64 start; + __u64 last; +#define VDUSE_ACCESS_RO 0x1 +#define VDUSE_ACCESS_WO 0x2 +#define VDUSE_ACCESS_RW 0x3 + __u8 perm; +}; + +/* + * Find the first IOVA region that overlaps with the range [start, last] + * and return the corresponding file descriptor. Return -EINVAL means the + * IOVA region doesn't exist. Caller should set start and last fields. + */ +#define VDUSE_IOTLB_GET_FD _IOWR(VDUSE_BASE, 0x10, struct vduse_iotlb_entry) + +/* + * Get the negotiated virtio features. It's a subset of the features in + * struct vduse_dev_config which can be accepted by virtio driver. It's + * only valid after FEATURES_OK status bit is set. + */ +#define VDUSE_DEV_GET_FEATURES _IOR(VDUSE_BASE, 0x11, __u64) + +/** + * struct vduse_config_data - data used to update configuration space + * @offset: the offset from the beginning of configuration space + * @length: the length to write to configuration space + * @buffer: the buffer used to write from + * + * Structure used by VDUSE_DEV_SET_CONFIG ioctl to update device + * configuration space. + */ +struct vduse_config_data { + __u32 offset; + __u32 length; + __u8 buffer[]; +}; + +/* Set device configuration space */ +#define VDUSE_DEV_SET_CONFIG _IOW(VDUSE_BASE, 0x12, struct vduse_config_data) + +/* + * Inject a config interrupt. It's usually used to notify virtio driver + * that device configuration space has changed. + */ +#define VDUSE_DEV_INJECT_CONFIG_IRQ _IO(VDUSE_BASE, 0x13) + +/** + * struct vduse_vq_config - basic configuration of a virtqueue + * @index: virtqueue index + * @max_size: the max size of virtqueue + * + * Structure used by VDUSE_VQ_SETUP ioctl to setup a virtqueue. + */ +struct vduse_vq_config { + __u32 index; + __u16 max_size; +}; + +/* + * Setup the specified virtqueue. Make sure all virtqueues have been + * configured before the device is attached to vDPA bus. + */ +#define VDUSE_VQ_SETUP _IOW(VDUSE_BASE, 0x14, struct vduse_vq_config) + +/** + * struct vduse_vq_state_split - split virtqueue state + * @avail_index: available index + */ +struct vduse_vq_state_split { + __u16 avail_index; +}; + +/** + * struct vduse_vq_state_packed - packed virtqueue state + * @last_avail_counter: last driver ring wrap counter observed by device + * @last_avail_idx: device available index + * @last_used_counter: device ring wrap counter + * @last_used_idx: used index + */ +struct vduse_vq_state_packed { + __u16 last_avail_counter; + __u16 last_avail_idx; + __u16 last_used_counter; + __u16 last_used_idx; +}; + +/** + * struct vduse_vq_info - information of a virtqueue + * @index: virtqueue index + * @num: the size of virtqueue + * @desc_addr: address of desc area + * @driver_addr: address of driver area + * @device_addr: address of device area + * @split: split virtqueue state + * @packed: packed virtqueue state + * @ready: ready status of virtqueue + * + * Structure used by VDUSE_VQ_GET_INFO ioctl to get virtqueue's information. + */ +struct vduse_vq_info { + __u32 index; + __u32 num; + __u64 desc_addr; + __u64 driver_addr; + __u64 device_addr; + union { + struct vduse_vq_state_split split; + struct vduse_vq_state_packed packed; + }; + __u8 ready; +}; + +/* Get the specified virtqueue's information. Caller should set index field. */ +#define VDUSE_VQ_GET_INFO _IOWR(VDUSE_BASE, 0x15, struct vduse_vq_info) + +/** + * struct vduse_vq_eventfd - eventfd configuration for a virtqueue + * @index: virtqueue index + * @fd: eventfd, -1 means de-assigning the eventfd + * + * Structure used by VDUSE_VQ_SETUP_KICKFD ioctl to setup kick eventfd. + */ +struct vduse_vq_eventfd { + __u32 index; +#define VDUSE_EVENTFD_DEASSIGN -1 + int fd; +}; + +/* + * Setup kick eventfd for specified virtqueue. The kick eventfd is used + * by VDUSE kernel module to notify userspace to consume the avail vring. + */ +#define VDUSE_VQ_SETUP_KICKFD _IOW(VDUSE_BASE, 0x16, struct vduse_vq_eventfd) + +/* + * Inject an interrupt for specific virtqueue. It's used to notify virtio driver + * to consume the used vring. + */ +#define VDUSE_VQ_INJECT_IRQ _IOW(VDUSE_BASE, 0x17, __u32) + +/* The control messages definition for read(2)/write(2) on /dev/vduse/$NAME */ + +/** + * enum vduse_req_type - request type + * @VDUSE_GET_VQ_STATE: get the state for specified virtqueue from userspace + * @VDUSE_SET_STATUS: set the device status + * @VDUSE_UPDATE_IOTLB: Notify userspace to update the memory mapping for + * specified IOVA range via VDUSE_IOTLB_GET_FD ioctl + */ +enum vduse_req_type { + VDUSE_GET_VQ_STATE, + VDUSE_SET_STATUS, + VDUSE_UPDATE_IOTLB, +}; + +/** + * struct vduse_vq_state - virtqueue state + * @index: virtqueue index + * @split: split virtqueue state + * @packed: packed virtqueue state + */ +struct vduse_vq_state { + __u32 index; + union { + struct vduse_vq_state_split split; + struct vduse_vq_state_packed packed; + }; +}; + +/** + * struct vduse_dev_status - device status + * @status: device status + */ +struct vduse_dev_status { + __u8 status; +}; + +/** + * struct vduse_iova_range - IOVA range [start, last] + * @start: start of the IOVA range + * @last: last of the IOVA range + */ +struct vduse_iova_range { + __u64 start; + __u64 last; +}; + +/** + * struct vduse_dev_request - control request + * @type: request type + * @request_id: request id + * @reserved: for future use + * @vq_state: virtqueue state, only index field is available + * @s: device status + * @iova: IOVA range for updating + * @padding: padding + * + * Structure used by read(2) on /dev/vduse/$NAME. + */ +struct vduse_dev_request { + __u32 type; + __u32 request_id; + __u32 reserved[4]; + union { + struct vduse_vq_state vq_state; + struct vduse_dev_status s; + struct vduse_iova_range iova; + __u32 padding[32]; + }; +}; + +/** + * struct vduse_dev_response - response to control request + * @request_id: corresponding request id + * @result: the result of request + * @reserved: for future use, needs to be initialized to zero + * @vq_state: virtqueue state + * @padding: padding + * + * Structure used by write(2) on /dev/vduse/$NAME. + */ +struct vduse_dev_response { + __u32 request_id; +#define VDUSE_REQ_RESULT_OK 0x00 +#define VDUSE_REQ_RESULT_FAILED 0x01 + __u32 result; + __u32 reserved[4]; + union { + struct vduse_vq_state vq_state; + __u32 padding[32]; + }; +}; + +#endif /* _UAPI_VDUSE_H_ */ From patchwork Wed Aug 18 12:06:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12444217 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 563B2C4338F for ; Wed, 18 Aug 2021 12:09:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 402636104F for ; Wed, 18 Aug 2021 12:09:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238458AbhHRMK2 (ORCPT ); Wed, 18 Aug 2021 08:10:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45522 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237798AbhHRMJf (ORCPT ); Wed, 18 Aug 2021 08:09:35 -0400 Received: from mail-pg1-x52f.google.com (mail-pg1-x52f.google.com [IPv6:2607:f8b0:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 17EF5C06129D for ; Wed, 18 Aug 2021 05:08:32 -0700 (PDT) Received: by mail-pg1-x52f.google.com with SMTP id t1so2017031pgv.3 for ; Wed, 18 Aug 2021 05:08:32 -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=B7XeocFx9fGqiwvP0MFHQEgiGTG4hw3FRLH1gBIzue8=; b=t1ud4SRjnxQ9cMMUf3jD/LXAt/a3nxYlfSpVJ2cWWv+97LY6GN6P+KhSJjUOJ4uflx MfFAa/K6tUnbuSFqnEfAlt1XsFHFGarYcJ0NSNHHkIOLTuIhAsKFsBUBSJdNjxteeei0 +rZpQW+/rtrvLZbxhYrObV713DYCnpkIt+N5leQ2kyDL0CbuD6M0wqKU/DLXFrRcIVb4 dip3lWnVu6uzcVzNjXEOp/Z93q/NwfDPHWdvnIhtADbW9KnwUv4hbWPM1HRgN9IPwrnz xoZwA1VpPA5buhHnegHCo93/vuscGbaDroQsG6vBpdSiiz0KnM1WOpy9o8AhaHfgmqhj HYEA== 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=B7XeocFx9fGqiwvP0MFHQEgiGTG4hw3FRLH1gBIzue8=; b=FaP9EDtMZcJ2e4PTBTIVkGIhx2IKxH+wpMbGPbp2mfWAGN3kOIy/qtWQgSSBYksuFt e0wZ/6bWZL/2kIeUJXHAN92F257b+fM9FN9z8exNZl8YQ7ytrcR2JLw4WNMA355Kv/pJ dlr5Ba2N6WHzzf7l9irfYAINiuLGQtTXGTQcFiu3Fl6sOnuSxt7YIvggO71IgLJfIMoa IFU8mfCwd2YodCLpiTx7pOwG/OzrTl5DXJ3935KkWLxfPaIc0inZsISx9EGlTFNxMG3q 1vSUeoxohakTyBStEXSy0pPht27ipbRnY9gvKbvqFjiD26OeBHCfHtRrR0t+lywYsw0E 9VBw== X-Gm-Message-State: AOAM533w4TYlYaLj5HdHAQCDWxD1X6vojhgfWI/ax8V4izpW5yZRhCNY v8IrLt0qssY1J3/qilv2Tm/3 X-Google-Smtp-Source: ABdhPJzBQNwwN3MKJvgmWi/6ibkpsv7M6D5x2JFcjCIgdF3qbvUUwOT0xGsHHpGjRPsxs8TF2AaNkQ== X-Received: by 2002:a63:e74b:: with SMTP id j11mr8600779pgk.322.1629288511600; Wed, 18 Aug 2021 05:08:31 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id u10sm7533716pgj.48.2021.08.18.05.08.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 05:08:31 -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 12/12] Documentation: Add documentation for VDUSE Date: Wed, 18 Aug 2021 20:06:42 +0800 Message-Id: <20210818120642.165-13-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: linux-fsdevel@vger.kernel.org VDUSE (vDPA Device in Userspace) is a framework to support implementing software-emulated vDPA devices in userspace. This document is intended to clarify the VDUSE design and usage. Signed-off-by: Xie Yongji Acked-by: Jason Wang Acked-by: Jason Wang --- Documentation/userspace-api/index.rst | 1 + Documentation/userspace-api/vduse.rst | 233 ++++++++++++++++++++++++++++++++++ 2 files changed, 234 insertions(+) create mode 100644 Documentation/userspace-api/vduse.rst diff --git a/Documentation/userspace-api/index.rst b/Documentation/userspace-api/index.rst index 0b5eefed027e..c432be070f67 100644 --- a/Documentation/userspace-api/index.rst +++ b/Documentation/userspace-api/index.rst @@ -27,6 +27,7 @@ place where this information is gathered. iommu media/index sysfs-platform_profile + vduse .. only:: subproject and html diff --git a/Documentation/userspace-api/vduse.rst b/Documentation/userspace-api/vduse.rst new file mode 100644 index 000000000000..42ef59ea5314 --- /dev/null +++ b/Documentation/userspace-api/vduse.rst @@ -0,0 +1,233 @@ +================================== +VDUSE - "vDPA Device in Userspace" +================================== + +vDPA (virtio data path acceleration) device is a device that uses a +datapath which complies with the virtio specifications with vendor +specific control path. vDPA devices can be both physically located on +the hardware or emulated by software. VDUSE is a framework that makes it +possible to implement software-emulated vDPA devices in userspace. And +to make the device emulation more secure, the emulated vDPA device's +control path is handled in the kernel and only the data path is +implemented in the userspace. + +Note that only virtio block device is supported by VDUSE framework now, +which can reduce security risks when the userspace process that implements +the data path is run by an unprivileged user. The support for other device +types can be added after the security issue of corresponding device driver +is clarified or fixed in the future. + +Create/Destroy VDUSE devices +------------------------ + +VDUSE devices are created as follows: + +1. Create a new VDUSE instance with ioctl(VDUSE_CREATE_DEV) on + /dev/vduse/control. + +2. Setup each virtqueue with ioctl(VDUSE_VQ_SETUP) on /dev/vduse/$NAME. + +3. Begin processing VDUSE messages from /dev/vduse/$NAME. The first + messages will arrive while attaching the VDUSE instance to vDPA bus. + +4. Send the VDPA_CMD_DEV_NEW netlink message to attach the VDUSE + instance to vDPA bus. + +VDUSE devices are destroyed as follows: + +1. Send the VDPA_CMD_DEV_DEL netlink message to detach the VDUSE + instance from vDPA bus. + +2. Close the file descriptor referring to /dev/vduse/$NAME. + +3. Destroy the VDUSE instance with ioctl(VDUSE_DESTROY_DEV) on + /dev/vduse/control. + +The netlink messages can be sent via vdpa tool in iproute2 or use the +below sample codes: + +.. code-block:: c + + static int netlink_add_vduse(const char *name, enum vdpa_command cmd) + { + struct nl_sock *nlsock; + struct nl_msg *msg; + int famid; + + nlsock = nl_socket_alloc(); + if (!nlsock) + return -ENOMEM; + + if (genl_connect(nlsock)) + goto free_sock; + + famid = genl_ctrl_resolve(nlsock, VDPA_GENL_NAME); + if (famid < 0) + goto close_sock; + + msg = nlmsg_alloc(); + if (!msg) + goto close_sock; + + if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, famid, 0, 0, cmd, 0)) + goto nla_put_failure; + + NLA_PUT_STRING(msg, VDPA_ATTR_DEV_NAME, name); + if (cmd == VDPA_CMD_DEV_NEW) + NLA_PUT_STRING(msg, VDPA_ATTR_MGMTDEV_DEV_NAME, "vduse"); + + if (nl_send_sync(nlsock, msg)) + goto close_sock; + + nl_close(nlsock); + nl_socket_free(nlsock); + + return 0; + nla_put_failure: + nlmsg_free(msg); + close_sock: + nl_close(nlsock); + free_sock: + nl_socket_free(nlsock); + return -1; + } + +How VDUSE works +--------------- + +As mentioned above, a VDUSE device is created by ioctl(VDUSE_CREATE_DEV) on +/dev/vduse/control. With this ioctl, userspace can specify some basic configuration +such as device name (uniquely identify a VDUSE device), virtio features, virtio +configuration space, the number of virtqueues and so on for this emulated device. +Then a char device interface (/dev/vduse/$NAME) is exported to userspace for device +emulation. Userspace can use the VDUSE_VQ_SETUP ioctl on /dev/vduse/$NAME to +add per-virtqueue configuration such as the max size of virtqueue to the device. + +After the initialization, the VDUSE device can be attached to vDPA bus via +the VDPA_CMD_DEV_NEW netlink message. Userspace needs to read()/write() on +/dev/vduse/$NAME to receive/reply some control messages from/to VDUSE kernel +module as follows: + +.. code-block:: c + + static int vduse_message_handler(int dev_fd) + { + int len; + struct vduse_dev_request req; + struct vduse_dev_response resp; + + len = read(dev_fd, &req, sizeof(req)); + if (len != sizeof(req)) + return -1; + + resp.request_id = req.request_id; + + switch (req.type) { + + /* handle different types of messages */ + + } + + len = write(dev_fd, &resp, sizeof(resp)); + if (len != sizeof(resp)) + return -1; + + return 0; + } + +There are now three types of messages introduced by VDUSE framework: + +- VDUSE_GET_VQ_STATE: Get the state for virtqueue, userspace should return + avail index for split virtqueue or the device/driver ring wrap counters and + the avail and used index for packed virtqueue. + +- VDUSE_SET_STATUS: Set the device status, userspace should follow + the virtio spec: https://docs.oasis-open.org/virtio/virtio/v1.1/virtio-v1.1.html + to process this message. For example, fail to set the FEATURES_OK device + status bit if the device can not accept the negotiated virtio features + get from the VDUSE_DEV_GET_FEATURES ioctl. + +- VDUSE_UPDATE_IOTLB: Notify userspace to update the memory mapping for specified + IOVA range, userspace should firstly remove the old mapping, then setup the new + mapping via the VDUSE_IOTLB_GET_FD ioctl. + +After DRIVER_OK status bit is set via the VDUSE_SET_STATUS message, userspace is +able to start the dataplane processing as follows: + +1. Get the specified virtqueue's information with the VDUSE_VQ_GET_INFO ioctl, + including the size, the IOVAs of descriptor table, available ring and used ring, + the state and the ready status. + +2. Pass the above IOVAs to the VDUSE_IOTLB_GET_FD ioctl so that those IOVA regions + can be mapped into userspace. Some sample codes is shown below: + +.. code-block:: c + + static int perm_to_prot(uint8_t perm) + { + int prot = 0; + + switch (perm) { + case VDUSE_ACCESS_WO: + prot |= PROT_WRITE; + break; + case VDUSE_ACCESS_RO: + prot |= PROT_READ; + break; + case VDUSE_ACCESS_RW: + prot |= PROT_READ | PROT_WRITE; + break; + } + + return prot; + } + + static void *iova_to_va(int dev_fd, uint64_t iova, uint64_t *len) + { + int fd; + void *addr; + size_t size; + struct vduse_iotlb_entry entry; + + entry.start = iova; + entry.last = iova; + + /* + * Find the first IOVA region that overlaps with the specified + * range [start, last] and return the corresponding file descriptor. + */ + fd = ioctl(dev_fd, VDUSE_IOTLB_GET_FD, &entry); + if (fd < 0) + return NULL; + + size = entry.last - entry.start + 1; + *len = entry.last - iova + 1; + addr = mmap(0, size, perm_to_prot(entry.perm), MAP_SHARED, + fd, entry.offset); + close(fd); + if (addr == MAP_FAILED) + return NULL; + + /* + * Using some data structures such as linked list to store + * the iotlb mapping. The munmap(2) should be called for the + * cached mapping when the corresponding VDUSE_UPDATE_IOTLB + * message is received or the device is reset. + */ + + return addr + iova - entry.start; + } + +3. Setup the kick eventfd for the specified virtqueues with the VDUSE_VQ_SETUP_KICKFD + ioctl. The kick eventfd is used by VDUSE kernel module to notify userspace to + consume the available ring. This is optional since userspace can choose to poll the + available ring instead. + +4. Listen to the kick eventfd (optional) and consume the available ring. The buffer + described by the descriptors in the descriptor table should be also mapped into + userspace via the VDUSE_IOTLB_GET_FD ioctl before accessing. + +5. Inject an interrupt for specific virtqueue with the VDUSE_INJECT_VQ_IRQ ioctl + after the used ring is filled. + +For more details on the uAPI, please see include/uapi/linux/vduse.h.