From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5856FC433FE for ; Tue, 12 Apr 2022 15:53:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351469AbiDLPz7 (ORCPT ); Tue, 12 Apr 2022 11:55:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51858 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235086AbiDLPz5 (ORCPT ); Tue, 12 Apr 2022 11:55:57 -0400 Received: from NAM04-DM6-obe.outbound.protection.outlook.com (mail-dm6nam08on2074.outbound.protection.outlook.com [40.107.102.74]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A51635FF2F; Tue, 12 Apr 2022 08:53:39 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=hbIOCtf3pyQiN/qRL7Pc1BWtc1RbVDIs0hfVBiTExHcK9G4f/YjAK/Jkt7L/2MGdK7B1FsWempiEbFoeoBnW6GIOZjD/JMHb11ojzw0Nr0CBX6gn50Le532L4gunLFMjdC04iGH1NiNnFbWnC4r4Bbsbvqonl1xLNiHUyK1DZg2NSlktLQGOjq8d5NRqR5+iN+Rn5/0+tZmlq7vMIeWlyeoHAcRos/lDzaB2WClLlF+U/FfaTMEzK7e8aCid3TW+K4nPZ27Y8ZT8/4O0HT3O33BfhyRnQdbK1Zc6NDiL93DohIqMn1EMslA9qnBbvHWUrF1KfIoibuFkeV65w6+Nvg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=ipBz6zUEzjNlBfn0keRHBKDv3oVAdL4US7ij5der/Fs=; b=Cq5hvQMKJBk9hTeb9QvumXRR1jzqVO3uXhUr4A6pwoXJIg3yysoNOPhWRSrzJnUBwwhJugOfPcxSFWJ8X1yK6GKDjJ3qLkp4tL/Q4FSmVbir9hiBi8raNDgPjQwWMjBamE2SyZNLMHy2dRGCLD2kGgsJyvuApPC8kp/S6WvuMGtHvAk+gFFSQ1mwuvm15NRpL2CQQZzDChkAZAfK72K1uUaE5Ud0+otXbUeqQkR8eIIO5QhRQd+kIsO7Zx1hGVe3K+l6SXIMqgOhQ+hJGh9AEziqG/w8FFSP4lUmDu/ug3sgfz/3duKrmIuo2DIj99/85QkyxZ68HrXa/YrqQAaSpw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ipBz6zUEzjNlBfn0keRHBKDv3oVAdL4US7ij5der/Fs=; b=nXpouJ5dJisZdHWVn3g8Ih2bT0DOm9BN15MJ2NZ4wE13hV0SWmcBFatzl9JbfHl2GQvihLLwywNzFEfIFT2MDVpSrKleAfX8fgGaM7Dmd8vYQv5Hm25AnTNL7csLe4rah2fA5mo1W5lj6E214EgHQOqcDMnoygU/M+KZoRVDS9tUj+weXAaW+GPxinOI9NiQvsLoV8XAjIRZ/NDYrmZEkzUD3tntpuvprbvp1BRb8Q/V3d1VarD/CJEZrW1teqd6QD7vUTPr337FtGeRkY60l0UBmVfCXP2Hze4CRX4Wr53ZlD7nR4FqlHJoY1/ard4gpr4DMoxubiPQL7dMAc8Qow== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from CH2PR12MB4181.namprd12.prod.outlook.com (2603:10b6:610:a8::16) by MN2PR12MB4045.namprd12.prod.outlook.com (2603:10b6:208:1d6::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5144.29; Tue, 12 Apr 2022 15:53:38 +0000 Received: from CH2PR12MB4181.namprd12.prod.outlook.com ([fe80::c911:71b5:78e6:3a38]) by CH2PR12MB4181.namprd12.prod.outlook.com ([fe80::c911:71b5:78e6:3a38%8]) with mapi id 15.20.5144.029; Tue, 12 Apr 2022 15:53:37 +0000 From: Jason Gunthorpe To: Alexander Gordeev , David Airlie , Tony Krowiak , Alex Williamson , Christian Borntraeger , Cornelia Huck , Jonathan Corbet , Daniel Vetter , dri-devel@lists.freedesktop.org, Eric Farman , Harald Freudenberger , Vasily Gorbik , Heiko Carstens , intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, Jani Nikula , Jason Herne , Joonas Lahtinen , kvm@vger.kernel.org, Kirti Wankhede , linux-doc@vger.kernel.org, linux-s390@vger.kernel.org, Matthew Rosato , Peter Oberparleiter , Halil Pasic , Rodrigo Vivi , Sven Schnelle , Tvrtko Ursulin , Vineeth Vijayan , Zhenyu Wang , Zhi Wang Cc: Christoph Hellwig , "Tian, Kevin" , "Liu, Yi L" Subject: [PATCH 5/9] vfio: Pass in a struct vfio_device * to vfio_dma_rw() Date: Tue, 12 Apr 2022 12:53:32 -0300 Message-Id: <5-v1-a8faf768d202+125dd-vfio_mdev_no_group_jgg@nvidia.com> In-Reply-To: <0-v1-a8faf768d202+125dd-vfio_mdev_no_group_jgg@nvidia.com> References: Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BL1P222CA0003.NAMP222.PROD.OUTLOOK.COM (2603:10b6:208:2c7::8) To CH2PR12MB4181.namprd12.prod.outlook.com (2603:10b6:610:a8::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5c50d941-b512-4790-917f-08da1c9c9b6d X-MS-TrafficTypeDiagnostic: MN2PR12MB4045:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH2PR12MB4181.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(4636009)(366004)(36756003)(4326008)(8676002)(66946007)(7416002)(2906002)(5660300002)(38100700002)(7406005)(921005)(83380400001)(316002)(2616005)(508600001)(186003)(8936002)(26005)(6512007)(86362001)(6666004)(6506007)(66476007)(6486002)(54906003)(110136005)(66556008)(4216001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?1tZ4TL1/AEwusqC9PDUcR2zgaAr68+UprHnq9kNcUko72YKFymWTRQMgvjUT?= =?us-ascii?Q?StV9dPfSXeM+M+XB8I3vFY0Np6jzLRd5lzV8W+suv2mpaeN+HAfkqNvTebM7?= =?us-ascii?Q?zLdjHaCfG5WhjDF20gS/s39P68Y0PNWh/8DhvYCOgeEw/T67Nb7KLLNqO+iD?= =?us-ascii?Q?AnyMmjbEZVrxGbGXXdBSbDspVZfsShHE1noDJGEiDD1eS7WQJbYgZ7+tQWHN?= =?us-ascii?Q?rpviYcLQAHJgKKLsiONmvyzd+kYmIgy1qBoe8p42Ggm2HkSvb4sDUNqwSo2p?= =?us-ascii?Q?InH8HBUUcaYZn7rfDhrUTH52t4lYGR6Fe6joXdcBvF+Kr+Vot95TB4UQb0r3?= =?us-ascii?Q?wsX/qIBe2b5+Q1ETSmJiWBkDeH4UdjBlYBeBhnzZDoOL4bVyttHwmGSm8sUS?= =?us-ascii?Q?Psr98sZ3/kSJ7B39CoJC3oBYaCoxidmd3JQhwmQTkZkDPNndSH7uWQO+XCf4?= =?us-ascii?Q?ARqJkie3qdG3vrnKFMPO54QLfm5tFq7dblA6ilVxyiDQhhD93AlMs5nzDWFq?= =?us-ascii?Q?DHDiW1H9mefloJcKndufo7uaFjqqDa9CiXHvyAXw6IMhAM0FPX80n01bpY2P?= =?us-ascii?Q?0M+6IL2UiFo4rM2v6KagqgMahPIeO8u8nUY8LYj2XH3wnbZ1nHFaP3+FFbYj?= =?us-ascii?Q?VdJN6mU/D40Ivc+LG9gOucrFEIlB29Uv3+z5ykJVhJ94wPIposIsUrLKLDHV?= =?us-ascii?Q?tNxeSIROv6Jo556TPJpcx3w3uM/tthAQJUstXsoFeJP5zNb+5upwhIoR4uDl?= =?us-ascii?Q?hMLIsPk5nJoW+KmNPuGe8anhS5jqNRP2vjcXgsZXJ/rvjjBhZrfz9RB193rv?= =?us-ascii?Q?jTNeFS8EepPkg1VgSVh1iKVoW5szNvVJQb34iXVBhjs7GB2OlkbCWzVToUCp?= =?us-ascii?Q?Z9FfHnz+TgAz5rUp7kYTTuD66/jAzI1c80zmgelTGBWNi4SG+MxrKh2tXwTc?= =?us-ascii?Q?R/Dr3p/YWHxNYEQ21R7lWiX6qlVYctylvNe8W4uJoRhJdHme0gtuzyMsGsT1?= =?us-ascii?Q?k7StOdbtgULJcwMdYf1XE+xdTYlKfiZGFwK9yQWXhf3LU1Y+bcet9oVNT5TN?= =?us-ascii?Q?uKcIeiSNgVwF+eB8lYH1XyjWW63HaGIoPObxloxGwBmEToPCsceUPMm2c/in?= =?us-ascii?Q?/2EDTOZmbtDKVuAhcToUHkd+m6FPGR4YwOnujMTdchAfird6EOCN50Gw7bQb?= =?us-ascii?Q?eK+b3nZDO4UoWZYZoVHF156t0LGR2qUb5x++oURV3HpDBvhPKqOcVTgpy0G1?= =?us-ascii?Q?r9y5vuiPnGEU4s0qY6lnAW+SAYo57LrjS8nQwUn1Pm0VIf+n8rD+ZK6x2nXP?= =?us-ascii?Q?bf3EYC4+s7RPV/OUaLcX8I6h3TQWg3tOFKxynaEwVw24nKYSdc33cJKrx4tx?= =?us-ascii?Q?EfGPrfGo249bL9tLtvvWLE38UeYvw6J6K+8bui3Zdvs8wuBMO/AvQd/uj0zh?= =?us-ascii?Q?pfCfpWhghkdlhpBoY3eH7l9+yPwga0yGex7MbEzlmgE64jdyKW93ADbFg1un?= =?us-ascii?Q?F7Pam07Y+z+hi6gK13S9tKrcZKesHJc1gP0VMumjSzd8qNGa2v/5GObqkTdg?= =?us-ascii?Q?IXWt66HjkNWLvyHB5F+uKqv16h4bmotS3IoGmCF4tIO18SEQt95ncueN4VoW?= =?us-ascii?Q?ChyPYwsPpxeQSAPs0LZnppidMhPCz0H+ZWxmhqTRdB8x+/pYM9qFMzRgWU2x?= =?us-ascii?Q?pMy92i7rtB19nk4jLZRX1Ib9m4Is7dYuv1mNXQuMzzqweoRSkRBISWhWFlr8?= =?us-ascii?Q?Ol1BjuoR/Q=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5c50d941-b512-4790-917f-08da1c9c9b6d X-MS-Exchange-CrossTenant-AuthSource: CH2PR12MB4181.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Apr 2022 15:53:37.5565 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: N2+AFwymYMaDbcHTsvWxuCnq5dPH3Hv9zNFKKQiIS3aGqzdgcRFdQcbDqCoaBEGH X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4045 Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org Every caller has a readily available vfio_device pointer, use that instead of passing in a generic struct device. The struct vfio_device already contains the group we need so this avoids complexity, extra refcountings, and a confusing lifecycle model. Signed-off-by: Jason Gunthorpe --- drivers/gpu/drm/i915/gvt/kvmgt.c | 5 +++-- drivers/vfio/vfio.c | 22 ++++++++++------------ include/linux/vfio.h | 2 +- 3 files changed, 14 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index df7d87409e3a9c..3302d5d4d92146 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -2184,8 +2184,9 @@ static int kvmgt_rw_gpa(unsigned long handle, unsigned long gpa, info = (struct kvmgt_guest_info *)handle; - return vfio_dma_rw(kvmgt_vdev(info->vgpu)->vfio_group, - gpa, buf, len, write); + return vfio_dma_rw( + mdev_legacy_get_vfio_device(kvmgt_vdev(info->vgpu)->mdev), + gpa, buf, len, write); } static int kvmgt_read_gpa(unsigned long handle, unsigned long gpa, diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 24b92a45cfc8f1..e6e102e017623b 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -2323,32 +2323,28 @@ EXPORT_SYMBOL(vfio_group_unpin_pages); * As the read/write of user space memory is conducted via the CPUs and is * not a real device DMA, it is not necessary to pin the user space memory. * - * The caller needs to call vfio_group_get_external_user() or - * vfio_group_get_external_user_from_dev() prior to calling this interface, - * so as to prevent the VFIO group from disposal in the middle of the call. - * But it can keep the reference to the VFIO group for several calls into - * this interface. - * After finishing using of the VFIO group, the caller needs to release the - * VFIO group by calling vfio_group_put_external_user(). - * - * @group [in] : VFIO group + * @vdev [in] : VFIO device * @user_iova [in] : base IOVA of a user space buffer * @data [in] : pointer to kernel buffer * @len [in] : kernel buffer length * @write : indicate read or write * Return error code on failure or 0 on success. */ -int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova, +int vfio_dma_rw(struct vfio_device *vdev, dma_addr_t user_iova, void *data, size_t len, bool write) { struct vfio_container *container; struct vfio_iommu_driver *driver; int ret = 0; - if (!group || !data || len <= 0) + if (!data || len <= 0) return -EINVAL; - container = group->container; + ret = vfio_group_add_container_user(vdev->group); + if (ret) + return ret; + + container = vdev->group->container; driver = container->iommu_driver; if (likely(driver && driver->ops->dma_rw)) @@ -2357,6 +2353,8 @@ int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova, else ret = -ENOTTY; + vfio_group_try_dissolve_container(vdev->group); + return ret; } EXPORT_SYMBOL(vfio_dma_rw); diff --git a/include/linux/vfio.h b/include/linux/vfio.h index 8f2a09801a660b..91d46e532ca104 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -161,7 +161,7 @@ extern int vfio_group_pin_pages(struct vfio_group *group, extern int vfio_group_unpin_pages(struct vfio_group *group, unsigned long *user_iova_pfn, int npage); -extern int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova, +extern int vfio_dma_rw(struct vfio_device *vdev, dma_addr_t user_iova, void *data, size_t len, bool write); extern struct iommu_domain *vfio_group_iommu_domain(struct vfio_group *group); -- 2.35.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A8DD3C43219 for ; Tue, 12 Apr 2022 15:53:56 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A0C4710E6F1; Tue, 12 Apr 2022 15:53:43 +0000 (UTC) Received: from NAM04-DM6-obe.outbound.protection.outlook.com (mail-dm6nam08on2075.outbound.protection.outlook.com [40.107.102.75]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8E40110E37F; Tue, 12 Apr 2022 15:53:40 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=hbIOCtf3pyQiN/qRL7Pc1BWtc1RbVDIs0hfVBiTExHcK9G4f/YjAK/Jkt7L/2MGdK7B1FsWempiEbFoeoBnW6GIOZjD/JMHb11ojzw0Nr0CBX6gn50Le532L4gunLFMjdC04iGH1NiNnFbWnC4r4Bbsbvqonl1xLNiHUyK1DZg2NSlktLQGOjq8d5NRqR5+iN+Rn5/0+tZmlq7vMIeWlyeoHAcRos/lDzaB2WClLlF+U/FfaTMEzK7e8aCid3TW+K4nPZ27Y8ZT8/4O0HT3O33BfhyRnQdbK1Zc6NDiL93DohIqMn1EMslA9qnBbvHWUrF1KfIoibuFkeV65w6+Nvg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=ipBz6zUEzjNlBfn0keRHBKDv3oVAdL4US7ij5der/Fs=; b=Cq5hvQMKJBk9hTeb9QvumXRR1jzqVO3uXhUr4A6pwoXJIg3yysoNOPhWRSrzJnUBwwhJugOfPcxSFWJ8X1yK6GKDjJ3qLkp4tL/Q4FSmVbir9hiBi8raNDgPjQwWMjBamE2SyZNLMHy2dRGCLD2kGgsJyvuApPC8kp/S6WvuMGtHvAk+gFFSQ1mwuvm15NRpL2CQQZzDChkAZAfK72K1uUaE5Ud0+otXbUeqQkR8eIIO5QhRQd+kIsO7Zx1hGVe3K+l6SXIMqgOhQ+hJGh9AEziqG/w8FFSP4lUmDu/ug3sgfz/3duKrmIuo2DIj99/85QkyxZ68HrXa/YrqQAaSpw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ipBz6zUEzjNlBfn0keRHBKDv3oVAdL4US7ij5der/Fs=; b=nXpouJ5dJisZdHWVn3g8Ih2bT0DOm9BN15MJ2NZ4wE13hV0SWmcBFatzl9JbfHl2GQvihLLwywNzFEfIFT2MDVpSrKleAfX8fgGaM7Dmd8vYQv5Hm25AnTNL7csLe4rah2fA5mo1W5lj6E214EgHQOqcDMnoygU/M+KZoRVDS9tUj+weXAaW+GPxinOI9NiQvsLoV8XAjIRZ/NDYrmZEkzUD3tntpuvprbvp1BRb8Q/V3d1VarD/CJEZrW1teqd6QD7vUTPr337FtGeRkY60l0UBmVfCXP2Hze4CRX4Wr53ZlD7nR4FqlHJoY1/ard4gpr4DMoxubiPQL7dMAc8Qow== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from CH2PR12MB4181.namprd12.prod.outlook.com (2603:10b6:610:a8::16) by MN2PR12MB4045.namprd12.prod.outlook.com (2603:10b6:208:1d6::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5144.29; Tue, 12 Apr 2022 15:53:38 +0000 Received: from CH2PR12MB4181.namprd12.prod.outlook.com ([fe80::c911:71b5:78e6:3a38]) by CH2PR12MB4181.namprd12.prod.outlook.com ([fe80::c911:71b5:78e6:3a38%8]) with mapi id 15.20.5144.029; Tue, 12 Apr 2022 15:53:37 +0000 From: Jason Gunthorpe To: Alexander Gordeev , David Airlie , Tony Krowiak , Alex Williamson , Christian Borntraeger , Cornelia Huck , Jonathan Corbet , Daniel Vetter , dri-devel@lists.freedesktop.org, Eric Farman , Harald Freudenberger , Vasily Gorbik , Heiko Carstens , intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, Jani Nikula , Jason Herne , Joonas Lahtinen , kvm@vger.kernel.org, Kirti Wankhede , linux-doc@vger.kernel.org, linux-s390@vger.kernel.org, Matthew Rosato , Peter Oberparleiter , Halil Pasic , Rodrigo Vivi , Sven Schnelle , Tvrtko Ursulin , Vineeth Vijayan , Zhenyu Wang , Zhi Wang Subject: [PATCH 5/9] vfio: Pass in a struct vfio_device * to vfio_dma_rw() Date: Tue, 12 Apr 2022 12:53:32 -0300 Message-Id: <5-v1-a8faf768d202+125dd-vfio_mdev_no_group_jgg@nvidia.com> In-Reply-To: <0-v1-a8faf768d202+125dd-vfio_mdev_no_group_jgg@nvidia.com> References: Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BL1P222CA0003.NAMP222.PROD.OUTLOOK.COM (2603:10b6:208:2c7::8) To CH2PR12MB4181.namprd12.prod.outlook.com (2603:10b6:610:a8::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5c50d941-b512-4790-917f-08da1c9c9b6d X-MS-TrafficTypeDiagnostic: MN2PR12MB4045:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:CH2PR12MB4181.namprd12.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230001)(4636009)(366004)(36756003)(4326008)(8676002)(66946007)(7416002)(2906002)(5660300002)(38100700002)(7406005)(921005)(83380400001)(316002)(2616005)(508600001)(186003)(8936002)(26005)(6512007)(86362001)(6666004)(6506007)(66476007)(6486002)(54906003)(110136005)(66556008)(4216001); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?1tZ4TL1/AEwusqC9PDUcR2zgaAr68+UprHnq9kNcUko72YKFymWTRQMgvjUT?= =?us-ascii?Q?StV9dPfSXeM+M+XB8I3vFY0Np6jzLRd5lzV8W+suv2mpaeN+HAfkqNvTebM7?= =?us-ascii?Q?zLdjHaCfG5WhjDF20gS/s39P68Y0PNWh/8DhvYCOgeEw/T67Nb7KLLNqO+iD?= =?us-ascii?Q?AnyMmjbEZVrxGbGXXdBSbDspVZfsShHE1noDJGEiDD1eS7WQJbYgZ7+tQWHN?= =?us-ascii?Q?rpviYcLQAHJgKKLsiONmvyzd+kYmIgy1qBoe8p42Ggm2HkSvb4sDUNqwSo2p?= =?us-ascii?Q?InH8HBUUcaYZn7rfDhrUTH52t4lYGR6Fe6joXdcBvF+Kr+Vot95TB4UQb0r3?= =?us-ascii?Q?wsX/qIBe2b5+Q1ETSmJiWBkDeH4UdjBlYBeBhnzZDoOL4bVyttHwmGSm8sUS?= =?us-ascii?Q?Psr98sZ3/kSJ7B39CoJC3oBYaCoxidmd3JQhwmQTkZkDPNndSH7uWQO+XCf4?= =?us-ascii?Q?ARqJkie3qdG3vrnKFMPO54QLfm5tFq7dblA6ilVxyiDQhhD93AlMs5nzDWFq?= =?us-ascii?Q?DHDiW1H9mefloJcKndufo7uaFjqqDa9CiXHvyAXw6IMhAM0FPX80n01bpY2P?= =?us-ascii?Q?0M+6IL2UiFo4rM2v6KagqgMahPIeO8u8nUY8LYj2XH3wnbZ1nHFaP3+FFbYj?= =?us-ascii?Q?VdJN6mU/D40Ivc+LG9gOucrFEIlB29Uv3+z5ykJVhJ94wPIposIsUrLKLDHV?= =?us-ascii?Q?tNxeSIROv6Jo556TPJpcx3w3uM/tthAQJUstXsoFeJP5zNb+5upwhIoR4uDl?= =?us-ascii?Q?hMLIsPk5nJoW+KmNPuGe8anhS5jqNRP2vjcXgsZXJ/rvjjBhZrfz9RB193rv?= =?us-ascii?Q?jTNeFS8EepPkg1VgSVh1iKVoW5szNvVJQb34iXVBhjs7GB2OlkbCWzVToUCp?= =?us-ascii?Q?Z9FfHnz+TgAz5rUp7kYTTuD66/jAzI1c80zmgelTGBWNi4SG+MxrKh2tXwTc?= =?us-ascii?Q?R/Dr3p/YWHxNYEQ21R7lWiX6qlVYctylvNe8W4uJoRhJdHme0gtuzyMsGsT1?= =?us-ascii?Q?k7StOdbtgULJcwMdYf1XE+xdTYlKfiZGFwK9yQWXhf3LU1Y+bcet9oVNT5TN?= =?us-ascii?Q?uKcIeiSNgVwF+eB8lYH1XyjWW63HaGIoPObxloxGwBmEToPCsceUPMm2c/in?= =?us-ascii?Q?/2EDTOZmbtDKVuAhcToUHkd+m6FPGR4YwOnujMTdchAfird6EOCN50Gw7bQb?= =?us-ascii?Q?eK+b3nZDO4UoWZYZoVHF156t0LGR2qUb5x++oURV3HpDBvhPKqOcVTgpy0G1?= =?us-ascii?Q?r9y5vuiPnGEU4s0qY6lnAW+SAYo57LrjS8nQwUn1Pm0VIf+n8rD+ZK6x2nXP?= =?us-ascii?Q?bf3EYC4+s7RPV/OUaLcX8I6h3TQWg3tOFKxynaEwVw24nKYSdc33cJKrx4tx?= =?us-ascii?Q?EfGPrfGo249bL9tLtvvWLE38UeYvw6J6K+8bui3Zdvs8wuBMO/AvQd/uj0zh?= =?us-ascii?Q?pfCfpWhghkdlhpBoY3eH7l9+yPwga0yGex7MbEzlmgE64jdyKW93ADbFg1un?= =?us-ascii?Q?F7Pam07Y+z+hi6gK13S9tKrcZKesHJc1gP0VMumjSzd8qNGa2v/5GObqkTdg?= =?us-ascii?Q?IXWt66HjkNWLvyHB5F+uKqv16h4bmotS3IoGmCF4tIO18SEQt95ncueN4VoW?= =?us-ascii?Q?ChyPYwsPpxeQSAPs0LZnppidMhPCz0H+ZWxmhqTRdB8x+/pYM9qFMzRgWU2x?= =?us-ascii?Q?pMy92i7rtB19nk4jLZRX1Ib9m4Is7dYuv1mNXQuMzzqweoRSkRBISWhWFlr8?= =?us-ascii?Q?Ol1BjuoR/Q=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5c50d941-b512-4790-917f-08da1c9c9b6d X-MS-Exchange-CrossTenant-AuthSource: CH2PR12MB4181.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Apr 2022 15:53:37.5565 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: N2+AFwymYMaDbcHTsvWxuCnq5dPH3Hv9zNFKKQiIS3aGqzdgcRFdQcbDqCoaBEGH X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4045 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Tian, Kevin" , "Liu, Yi L" , Christoph Hellwig Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Every caller has a readily available vfio_device pointer, use that instead of passing in a generic struct device. The struct vfio_device already contains the group we need so this avoids complexity, extra refcountings, and a confusing lifecycle model. Signed-off-by: Jason Gunthorpe --- drivers/gpu/drm/i915/gvt/kvmgt.c | 5 +++-- drivers/vfio/vfio.c | 22 ++++++++++------------ include/linux/vfio.h | 2 +- 3 files changed, 14 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index df7d87409e3a9c..3302d5d4d92146 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -2184,8 +2184,9 @@ static int kvmgt_rw_gpa(unsigned long handle, unsigned long gpa, info = (struct kvmgt_guest_info *)handle; - return vfio_dma_rw(kvmgt_vdev(info->vgpu)->vfio_group, - gpa, buf, len, write); + return vfio_dma_rw( + mdev_legacy_get_vfio_device(kvmgt_vdev(info->vgpu)->mdev), + gpa, buf, len, write); } static int kvmgt_read_gpa(unsigned long handle, unsigned long gpa, diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 24b92a45cfc8f1..e6e102e017623b 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -2323,32 +2323,28 @@ EXPORT_SYMBOL(vfio_group_unpin_pages); * As the read/write of user space memory is conducted via the CPUs and is * not a real device DMA, it is not necessary to pin the user space memory. * - * The caller needs to call vfio_group_get_external_user() or - * vfio_group_get_external_user_from_dev() prior to calling this interface, - * so as to prevent the VFIO group from disposal in the middle of the call. - * But it can keep the reference to the VFIO group for several calls into - * this interface. - * After finishing using of the VFIO group, the caller needs to release the - * VFIO group by calling vfio_group_put_external_user(). - * - * @group [in] : VFIO group + * @vdev [in] : VFIO device * @user_iova [in] : base IOVA of a user space buffer * @data [in] : pointer to kernel buffer * @len [in] : kernel buffer length * @write : indicate read or write * Return error code on failure or 0 on success. */ -int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova, +int vfio_dma_rw(struct vfio_device *vdev, dma_addr_t user_iova, void *data, size_t len, bool write) { struct vfio_container *container; struct vfio_iommu_driver *driver; int ret = 0; - if (!group || !data || len <= 0) + if (!data || len <= 0) return -EINVAL; - container = group->container; + ret = vfio_group_add_container_user(vdev->group); + if (ret) + return ret; + + container = vdev->group->container; driver = container->iommu_driver; if (likely(driver && driver->ops->dma_rw)) @@ -2357,6 +2353,8 @@ int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova, else ret = -ENOTTY; + vfio_group_try_dissolve_container(vdev->group); + return ret; } EXPORT_SYMBOL(vfio_dma_rw); diff --git a/include/linux/vfio.h b/include/linux/vfio.h index 8f2a09801a660b..91d46e532ca104 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -161,7 +161,7 @@ extern int vfio_group_pin_pages(struct vfio_group *group, extern int vfio_group_unpin_pages(struct vfio_group *group, unsigned long *user_iova_pfn, int npage); -extern int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova, +extern int vfio_dma_rw(struct vfio_device *vdev, dma_addr_t user_iova, void *data, size_t len, bool write); extern struct iommu_domain *vfio_group_iommu_domain(struct vfio_group *group); -- 2.35.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EBD56C433EF for ; Tue, 12 Apr 2022 15:54:05 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D965210E6C5; Tue, 12 Apr 2022 15:53:45 +0000 (UTC) Received: from NAM04-DM6-obe.outbound.protection.outlook.com (mail-dm6nam08on2075.outbound.protection.outlook.com [40.107.102.75]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8E40110E37F; Tue, 12 Apr 2022 15:53:40 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=hbIOCtf3pyQiN/qRL7Pc1BWtc1RbVDIs0hfVBiTExHcK9G4f/YjAK/Jkt7L/2MGdK7B1FsWempiEbFoeoBnW6GIOZjD/JMHb11ojzw0Nr0CBX6gn50Le532L4gunLFMjdC04iGH1NiNnFbWnC4r4Bbsbvqonl1xLNiHUyK1DZg2NSlktLQGOjq8d5NRqR5+iN+Rn5/0+tZmlq7vMIeWlyeoHAcRos/lDzaB2WClLlF+U/FfaTMEzK7e8aCid3TW+K4nPZ27Y8ZT8/4O0HT3O33BfhyRnQdbK1Zc6NDiL93DohIqMn1EMslA9qnBbvHWUrF1KfIoibuFkeV65w6+Nvg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=ipBz6zUEzjNlBfn0keRHBKDv3oVAdL4US7ij5der/Fs=; b=Cq5hvQMKJBk9hTeb9QvumXRR1jzqVO3uXhUr4A6pwoXJIg3yysoNOPhWRSrzJnUBwwhJugOfPcxSFWJ8X1yK6GKDjJ3qLkp4tL/Q4FSmVbir9hiBi8raNDgPjQwWMjBamE2SyZNLMHy2dRGCLD2kGgsJyvuApPC8kp/S6WvuMGtHvAk+gFFSQ1mwuvm15NRpL2CQQZzDChkAZAfK72K1uUaE5Ud0+otXbUeqQkR8eIIO5QhRQd+kIsO7Zx1hGVe3K+l6SXIMqgOhQ+hJGh9AEziqG/w8FFSP4lUmDu/ug3sgfz/3duKrmIuo2DIj99/85QkyxZ68HrXa/YrqQAaSpw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ipBz6zUEzjNlBfn0keRHBKDv3oVAdL4US7ij5der/Fs=; b=nXpouJ5dJisZdHWVn3g8Ih2bT0DOm9BN15MJ2NZ4wE13hV0SWmcBFatzl9JbfHl2GQvihLLwywNzFEfIFT2MDVpSrKleAfX8fgGaM7Dmd8vYQv5Hm25AnTNL7csLe4rah2fA5mo1W5lj6E214EgHQOqcDMnoygU/M+KZoRVDS9tUj+weXAaW+GPxinOI9NiQvsLoV8XAjIRZ/NDYrmZEkzUD3tntpuvprbvp1BRb8Q/V3d1VarD/CJEZrW1teqd6QD7vUTPr337FtGeRkY60l0UBmVfCXP2Hze4CRX4Wr53ZlD7nR4FqlHJoY1/ard4gpr4DMoxubiPQL7dMAc8Qow== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from CH2PR12MB4181.namprd12.prod.outlook.com (2603:10b6:610:a8::16) by MN2PR12MB4045.namprd12.prod.outlook.com (2603:10b6:208:1d6::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5144.29; Tue, 12 Apr 2022 15:53:38 +0000 Received: from CH2PR12MB4181.namprd12.prod.outlook.com ([fe80::c911:71b5:78e6:3a38]) by CH2PR12MB4181.namprd12.prod.outlook.com ([fe80::c911:71b5:78e6:3a38%8]) with mapi id 15.20.5144.029; Tue, 12 Apr 2022 15:53:37 +0000 From: Jason Gunthorpe To: Alexander Gordeev , David Airlie , Tony Krowiak , Alex Williamson , Christian Borntraeger , Cornelia Huck , Jonathan Corbet , Daniel Vetter , dri-devel@lists.freedesktop.org, Eric Farman , Harald Freudenberger , Vasily Gorbik , Heiko Carstens , intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, Jani Nikula , Jason Herne , Joonas Lahtinen , kvm@vger.kernel.org, Kirti Wankhede , linux-doc@vger.kernel.org, linux-s390@vger.kernel.org, Matthew Rosato , Peter Oberparleiter , Halil Pasic , Rodrigo Vivi , Sven Schnelle , Tvrtko Ursulin , Vineeth Vijayan , Zhenyu Wang , Zhi Wang Date: Tue, 12 Apr 2022 12:53:32 -0300 Message-Id: <5-v1-a8faf768d202+125dd-vfio_mdev_no_group_jgg@nvidia.com> In-Reply-To: <0-v1-a8faf768d202+125dd-vfio_mdev_no_group_jgg@nvidia.com> References: Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BL1P222CA0003.NAMP222.PROD.OUTLOOK.COM (2603:10b6:208:2c7::8) To CH2PR12MB4181.namprd12.prod.outlook.com (2603:10b6:610:a8::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5c50d941-b512-4790-917f-08da1c9c9b6d X-MS-TrafficTypeDiagnostic: MN2PR12MB4045:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:CH2PR12MB4181.namprd12.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230001)(4636009)(366004)(36756003)(4326008)(8676002)(66946007)(7416002)(2906002)(5660300002)(38100700002)(7406005)(921005)(83380400001)(316002)(2616005)(508600001)(186003)(8936002)(26005)(6512007)(86362001)(6666004)(6506007)(66476007)(6486002)(54906003)(110136005)(66556008)(4216001); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?1tZ4TL1/AEwusqC9PDUcR2zgaAr68+UprHnq9kNcUko72YKFymWTRQMgvjUT?= =?us-ascii?Q?StV9dPfSXeM+M+XB8I3vFY0Np6jzLRd5lzV8W+suv2mpaeN+HAfkqNvTebM7?= =?us-ascii?Q?zLdjHaCfG5WhjDF20gS/s39P68Y0PNWh/8DhvYCOgeEw/T67Nb7KLLNqO+iD?= =?us-ascii?Q?AnyMmjbEZVrxGbGXXdBSbDspVZfsShHE1noDJGEiDD1eS7WQJbYgZ7+tQWHN?= =?us-ascii?Q?rpviYcLQAHJgKKLsiONmvyzd+kYmIgy1qBoe8p42Ggm2HkSvb4sDUNqwSo2p?= =?us-ascii?Q?InH8HBUUcaYZn7rfDhrUTH52t4lYGR6Fe6joXdcBvF+Kr+Vot95TB4UQb0r3?= =?us-ascii?Q?wsX/qIBe2b5+Q1ETSmJiWBkDeH4UdjBlYBeBhnzZDoOL4bVyttHwmGSm8sUS?= =?us-ascii?Q?Psr98sZ3/kSJ7B39CoJC3oBYaCoxidmd3JQhwmQTkZkDPNndSH7uWQO+XCf4?= =?us-ascii?Q?ARqJkie3qdG3vrnKFMPO54QLfm5tFq7dblA6ilVxyiDQhhD93AlMs5nzDWFq?= =?us-ascii?Q?DHDiW1H9mefloJcKndufo7uaFjqqDa9CiXHvyAXw6IMhAM0FPX80n01bpY2P?= =?us-ascii?Q?0M+6IL2UiFo4rM2v6KagqgMahPIeO8u8nUY8LYj2XH3wnbZ1nHFaP3+FFbYj?= =?us-ascii?Q?VdJN6mU/D40Ivc+LG9gOucrFEIlB29Uv3+z5ykJVhJ94wPIposIsUrLKLDHV?= =?us-ascii?Q?tNxeSIROv6Jo556TPJpcx3w3uM/tthAQJUstXsoFeJP5zNb+5upwhIoR4uDl?= =?us-ascii?Q?hMLIsPk5nJoW+KmNPuGe8anhS5jqNRP2vjcXgsZXJ/rvjjBhZrfz9RB193rv?= =?us-ascii?Q?jTNeFS8EepPkg1VgSVh1iKVoW5szNvVJQb34iXVBhjs7GB2OlkbCWzVToUCp?= =?us-ascii?Q?Z9FfHnz+TgAz5rUp7kYTTuD66/jAzI1c80zmgelTGBWNi4SG+MxrKh2tXwTc?= =?us-ascii?Q?R/Dr3p/YWHxNYEQ21R7lWiX6qlVYctylvNe8W4uJoRhJdHme0gtuzyMsGsT1?= =?us-ascii?Q?k7StOdbtgULJcwMdYf1XE+xdTYlKfiZGFwK9yQWXhf3LU1Y+bcet9oVNT5TN?= =?us-ascii?Q?uKcIeiSNgVwF+eB8lYH1XyjWW63HaGIoPObxloxGwBmEToPCsceUPMm2c/in?= =?us-ascii?Q?/2EDTOZmbtDKVuAhcToUHkd+m6FPGR4YwOnujMTdchAfird6EOCN50Gw7bQb?= =?us-ascii?Q?eK+b3nZDO4UoWZYZoVHF156t0LGR2qUb5x++oURV3HpDBvhPKqOcVTgpy0G1?= =?us-ascii?Q?r9y5vuiPnGEU4s0qY6lnAW+SAYo57LrjS8nQwUn1Pm0VIf+n8rD+ZK6x2nXP?= =?us-ascii?Q?bf3EYC4+s7RPV/OUaLcX8I6h3TQWg3tOFKxynaEwVw24nKYSdc33cJKrx4tx?= =?us-ascii?Q?EfGPrfGo249bL9tLtvvWLE38UeYvw6J6K+8bui3Zdvs8wuBMO/AvQd/uj0zh?= =?us-ascii?Q?pfCfpWhghkdlhpBoY3eH7l9+yPwga0yGex7MbEzlmgE64jdyKW93ADbFg1un?= =?us-ascii?Q?F7Pam07Y+z+hi6gK13S9tKrcZKesHJc1gP0VMumjSzd8qNGa2v/5GObqkTdg?= =?us-ascii?Q?IXWt66HjkNWLvyHB5F+uKqv16h4bmotS3IoGmCF4tIO18SEQt95ncueN4VoW?= =?us-ascii?Q?ChyPYwsPpxeQSAPs0LZnppidMhPCz0H+ZWxmhqTRdB8x+/pYM9qFMzRgWU2x?= =?us-ascii?Q?pMy92i7rtB19nk4jLZRX1Ib9m4Is7dYuv1mNXQuMzzqweoRSkRBISWhWFlr8?= =?us-ascii?Q?Ol1BjuoR/Q=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5c50d941-b512-4790-917f-08da1c9c9b6d X-MS-Exchange-CrossTenant-AuthSource: CH2PR12MB4181.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Apr 2022 15:53:37.5565 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: N2+AFwymYMaDbcHTsvWxuCnq5dPH3Hv9zNFKKQiIS3aGqzdgcRFdQcbDqCoaBEGH X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4045 Subject: [Intel-gfx] [PATCH 5/9] vfio: Pass in a struct vfio_device * to vfio_dma_rw() X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Liu, Yi L" , Christoph Hellwig Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Every caller has a readily available vfio_device pointer, use that instead of passing in a generic struct device. The struct vfio_device already contains the group we need so this avoids complexity, extra refcountings, and a confusing lifecycle model. Signed-off-by: Jason Gunthorpe --- drivers/gpu/drm/i915/gvt/kvmgt.c | 5 +++-- drivers/vfio/vfio.c | 22 ++++++++++------------ include/linux/vfio.h | 2 +- 3 files changed, 14 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index df7d87409e3a9c..3302d5d4d92146 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -2184,8 +2184,9 @@ static int kvmgt_rw_gpa(unsigned long handle, unsigned long gpa, info = (struct kvmgt_guest_info *)handle; - return vfio_dma_rw(kvmgt_vdev(info->vgpu)->vfio_group, - gpa, buf, len, write); + return vfio_dma_rw( + mdev_legacy_get_vfio_device(kvmgt_vdev(info->vgpu)->mdev), + gpa, buf, len, write); } static int kvmgt_read_gpa(unsigned long handle, unsigned long gpa, diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 24b92a45cfc8f1..e6e102e017623b 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -2323,32 +2323,28 @@ EXPORT_SYMBOL(vfio_group_unpin_pages); * As the read/write of user space memory is conducted via the CPUs and is * not a real device DMA, it is not necessary to pin the user space memory. * - * The caller needs to call vfio_group_get_external_user() or - * vfio_group_get_external_user_from_dev() prior to calling this interface, - * so as to prevent the VFIO group from disposal in the middle of the call. - * But it can keep the reference to the VFIO group for several calls into - * this interface. - * After finishing using of the VFIO group, the caller needs to release the - * VFIO group by calling vfio_group_put_external_user(). - * - * @group [in] : VFIO group + * @vdev [in] : VFIO device * @user_iova [in] : base IOVA of a user space buffer * @data [in] : pointer to kernel buffer * @len [in] : kernel buffer length * @write : indicate read or write * Return error code on failure or 0 on success. */ -int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova, +int vfio_dma_rw(struct vfio_device *vdev, dma_addr_t user_iova, void *data, size_t len, bool write) { struct vfio_container *container; struct vfio_iommu_driver *driver; int ret = 0; - if (!group || !data || len <= 0) + if (!data || len <= 0) return -EINVAL; - container = group->container; + ret = vfio_group_add_container_user(vdev->group); + if (ret) + return ret; + + container = vdev->group->container; driver = container->iommu_driver; if (likely(driver && driver->ops->dma_rw)) @@ -2357,6 +2353,8 @@ int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova, else ret = -ENOTTY; + vfio_group_try_dissolve_container(vdev->group); + return ret; } EXPORT_SYMBOL(vfio_dma_rw); diff --git a/include/linux/vfio.h b/include/linux/vfio.h index 8f2a09801a660b..91d46e532ca104 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -161,7 +161,7 @@ extern int vfio_group_pin_pages(struct vfio_group *group, extern int vfio_group_unpin_pages(struct vfio_group *group, unsigned long *user_iova_pfn, int npage); -extern int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova, +extern int vfio_dma_rw(struct vfio_device *vdev, dma_addr_t user_iova, void *data, size_t len, bool write); extern struct iommu_domain *vfio_group_iommu_domain(struct vfio_group *group); -- 2.35.1