From patchwork Tue Feb 21 03:48:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13147373 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 5A61DC636D7 for ; Tue, 21 Feb 2023 03:48:46 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A2C9010E258; Tue, 21 Feb 2023 03:48:44 +0000 (UTC) Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by gabe.freedesktop.org (Postfix) with ESMTPS id E19C710E135; Tue, 21 Feb 2023 03:48:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1676951301; x=1708487301; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=/h9a1UpumCTWmQmp37F9w/rOzmCKJYFD57pL6RR5oNg=; b=YLvWS6WAVKFKpfpJ7/rC14oIkC7NXeyfjGPXzantOJJF2Bxb+LMs3KY6 APnIoLPNm8Pu6y5880q3emsj7xFfOHf0wAIkIRBjDpG9931ySD0293t00 tqwVSYDFyXmvhsJwlhrVyU+NQyEr38rvi5pFDby4WzP6JxFfHCvi+pZYl QSMvxWQgUEbJ2xD7DXn7Nw8kafznZAruCsaJt/M0aPLHidEZqqiPlLh64 ghPiD4P+MhEvx85nkYG0TteLCzFl4rc3jGqFxKfw9aS6AcY75lezt9j+3 Yu3BwTMQYtp0O6wO8A5G3hWk48k6Uki+HZslGo79YQ9ZkGI5z3xYVcL2q g==; X-IronPort-AV: E=McAfee;i="6500,9779,10627"; a="397218442" X-IronPort-AV: E=Sophos;i="5.97,314,1669104000"; d="scan'208";a="397218442" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Feb 2023 19:48:19 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10627"; a="664822169" X-IronPort-AV: E=Sophos;i="5.97,314,1669104000"; d="scan'208";a="664822169" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by orsmga007.jf.intel.com with ESMTP; 20 Feb 2023 19:48:19 -0800 From: Yi Liu To: alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com Date: Mon, 20 Feb 2023 19:48:00 -0800 Message-Id: <20230221034812.138051-8-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230221034812.138051-1-yi.l.liu@intel.com> References: <20230221034812.138051-1-yi.l.liu@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v4 07/19] vfio: Block device access via device fd until device is opened 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: linux-s390@vger.kernel.org, yi.l.liu@intel.com, yi.y.sun@linux.intel.com, kvm@vger.kernel.org, mjrosato@linux.ibm.com, joro@8bytes.org, cohuck@redhat.com, xudong.hao@intel.com, peterx@redhat.com, yan.y.zhao@intel.com, eric.auger@redhat.com, terrence.xu@intel.com, nicolinc@nvidia.com, shameerali.kolothum.thodi@huawei.com, suravee.suthikulpanit@amd.com, intel-gfx@lists.freedesktop.org, chao.p.peng@linux.intel.com, lulu@redhat.com, intel-gvt-dev@lists.freedesktop.org, jasowang@redhat.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Allow the vfio_device file to be in a state where the device FD is opened but the device cannot be used by userspace (i.e. its .open_device() hasn't been called). This inbetween state is not used when the device FD is spawned from the group FD, however when we create the device FD directly by opening a cdev it will be opened in the blocked state. The reason for the inbetween state is that userspace only gets a FD but doesn't gain access permission until binding the FD to an iommufd. So in the blocked state, only the bind operation is allowed. Completing bind will allow user to further access the device. This is implemented by adding a flag in struct vfio_device_file to mark the blocked state and using a simple smp_load_acquire() to obtain the flag value and serialize all the device setup with the thread accessing this device. Following this lockless scheme, it can safely handle the device FD unbound->bound but it cannot handle bound->unbound. To allow this we'd need to add a lock on all the vfio ioctls which seems costly. So once device FD is bound, it remains bound until the FD is closed. Suggested-by: Jason Gunthorpe Signed-off-by: Yi Liu Reviewed-by: Kevin Tian --- drivers/vfio/group.c | 6 ++++++ drivers/vfio/vfio.h | 1 + drivers/vfio/vfio_main.c | 16 ++++++++++++++++ 3 files changed, 23 insertions(+) diff --git a/drivers/vfio/group.c b/drivers/vfio/group.c index 2abf55c69281..14e29525e354 100644 --- a/drivers/vfio/group.c +++ b/drivers/vfio/group.c @@ -197,6 +197,12 @@ static int vfio_device_group_open(struct vfio_device_file *df) if (device->open_count == 0) vfio_device_put_kvm(device); + /* + * Paired with smp_load_acquire() in vfio_device_fops::ioctl/ + * read/write/mmap + */ + smp_store_release(&df->access_granted, true); + mutex_unlock(&device->dev_set->lock); out_unlock: diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h index 11e56fe079a1..d56cdb114024 100644 --- a/drivers/vfio/vfio.h +++ b/drivers/vfio/vfio.h @@ -18,6 +18,7 @@ struct vfio_container; struct vfio_device_file { struct vfio_device *device; + bool access_granted; spinlock_t kvm_ref_lock; /* protect kvm field */ struct kvm *kvm; struct iommufd_ctx *iommufd; /* protected by struct vfio_device_set::lock */ diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index ea507a61e3b7..91c8f25393db 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -1106,6 +1106,10 @@ static long vfio_device_fops_unl_ioctl(struct file *filep, struct vfio_device *device = df->device; int ret; + /* Paired with smp_store_release() in vfio_device_open() */ + if (!smp_load_acquire(&df->access_granted)) + return -EINVAL; + ret = vfio_device_pm_runtime_get(device); if (ret) return ret; @@ -1133,6 +1137,10 @@ static ssize_t vfio_device_fops_read(struct file *filep, char __user *buf, struct vfio_device_file *df = filep->private_data; struct vfio_device *device = df->device; + /* Paired with smp_store_release() in vfio_device_open() */ + if (!smp_load_acquire(&df->access_granted)) + return -EINVAL; + if (unlikely(!device->ops->read)) return -EINVAL; @@ -1146,6 +1154,10 @@ static ssize_t vfio_device_fops_write(struct file *filep, struct vfio_device_file *df = filep->private_data; struct vfio_device *device = df->device; + /* Paired with smp_store_release() in vfio_device_open() */ + if (!smp_load_acquire(&df->access_granted)) + return -EINVAL; + if (unlikely(!device->ops->write)) return -EINVAL; @@ -1157,6 +1169,10 @@ static int vfio_device_fops_mmap(struct file *filep, struct vm_area_struct *vma) struct vfio_device_file *df = filep->private_data; struct vfio_device *device = df->device; + /* Paired with smp_store_release() in vfio_device_open() */ + if (!smp_load_acquire(&df->access_granted)) + return -EINVAL; + if (unlikely(!device->ops->mmap)) return -EINVAL;