From patchwork Fri Feb 22 02:19:25 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baolu Lu X-Patchwork-Id: 10825069 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9E1A91399 for ; Fri, 22 Feb 2019 02:25:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8BA7531F32 for ; Fri, 22 Feb 2019 02:25:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 802B231F3B; Fri, 22 Feb 2019 02:25:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0729B31F32 for ; Fri, 22 Feb 2019 02:25:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727246AbfBVCZX (ORCPT ); Thu, 21 Feb 2019 21:25:23 -0500 Received: from mga01.intel.com ([192.55.52.88]:59159 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727198AbfBVCZV (ORCPT ); Thu, 21 Feb 2019 21:25:21 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Feb 2019 18:25:21 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.58,397,1544515200"; d="scan'208";a="116855221" Received: from allen-box.sh.intel.com ([10.239.159.136]) by orsmga007.jf.intel.com with ESMTP; 21 Feb 2019 18:25:17 -0800 From: Lu Baolu To: Joerg Roedel , David Woodhouse , Alex Williamson , Kirti Wankhede Cc: ashok.raj@intel.com, sanjay.k.kumar@intel.com, jacob.jun.pan@intel.com, kevin.tian@intel.com, Jean-Philippe Brucker , yi.l.liu@intel.com, yi.y.sun@intel.com, peterx@redhat.com, tiwei.bie@intel.com, xin.zeng@intel.com, iommu@lists.linux-foundation.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Lu Baolu , Jacob Pan Subject: [PATCH v7 7/9] vfio/mdev: Add iommu related member in mdev_device Date: Fri, 22 Feb 2019 10:19:25 +0800 Message-Id: <20190222021927.13132-8-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190222021927.13132-1-baolu.lu@linux.intel.com> References: <20190222021927.13132-1-baolu.lu@linux.intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP A parent device might create different types of mediated devices. For example, a mediated device could be created by the parent device with full isolation and protection provided by the IOMMU. One usage case could be found on Intel platforms where a mediated device is an assignable subset of a PCI, the DMA requests on behalf of it are all tagged with a PASID. Since IOMMU supports PASID-granular translations (scalable mode in VT-d 3.0), this mediated device could be individually protected and isolated by an IOMMU. This patch adds a new member in the struct mdev_device to indicate that the mediated device represented by mdev could be isolated and protected by attaching a domain to a device represented by mdev->iommu_device. It also adds a helper to add or set the iommu device. * mdev_device->iommu_device - This, if set, indicates that the mediated device could be fully isolated and protected by IOMMU via attaching an iommu domain to this device. If empty, it indicates using vendor defined isolation, hence bypass IOMMU. * mdev_set/get_iommu_device(dev, iommu_device) - Set or get the iommu device which represents this mdev in IOMMU's device scope. Drivers don't need to set the iommu device if it uses vendor defined isolation. Cc: Ashok Raj Cc: Jacob Pan Cc: Kevin Tian Cc: Liu Yi L Suggested-by: Kevin Tian Suggested-by: Alex Williamson Signed-off-by: Lu Baolu Reviewed-by: Jean-Philippe Brucker --- drivers/vfio/mdev/mdev_core.c | 18 ++++++++++++++++++ drivers/vfio/mdev/mdev_private.h | 1 + include/linux/mdev.h | 14 ++++++++++++++ 3 files changed, 33 insertions(+) diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c index 0212f0ee8aea..9be58d392d2b 100644 --- a/drivers/vfio/mdev/mdev_core.c +++ b/drivers/vfio/mdev/mdev_core.c @@ -390,6 +390,24 @@ int mdev_device_remove(struct device *dev, bool force_remove) return 0; } +int mdev_set_iommu_device(struct device *dev, struct device *iommu_device) +{ + struct mdev_device *mdev = to_mdev_device(dev); + + mdev->iommu_device = iommu_device; + + return 0; +} +EXPORT_SYMBOL(mdev_set_iommu_device); + +struct device *mdev_get_iommu_device(struct device *dev) +{ + struct mdev_device *mdev = to_mdev_device(dev); + + return mdev->iommu_device; +} +EXPORT_SYMBOL(mdev_get_iommu_device); + static int __init mdev_init(void) { return mdev_bus_register(); diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h index b5819b7d7ef7..891841862ef8 100644 --- a/drivers/vfio/mdev/mdev_private.h +++ b/drivers/vfio/mdev/mdev_private.h @@ -34,6 +34,7 @@ struct mdev_device { struct list_head next; struct kobject *type_kobj; bool active; + struct device *iommu_device; }; #define to_mdev_device(dev) container_of(dev, struct mdev_device, dev) diff --git a/include/linux/mdev.h b/include/linux/mdev.h index b6e048e1045f..c3ab8a9cfcc7 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -15,6 +15,20 @@ struct mdev_device; +/* + * Called by the parent device driver to set the device which represents + * this mdev in iommu protection scope. By default, the iommu device is + * NULL, that indicates using vendor defined isolation. + * + * @dev: the mediated device that iommu will isolate. + * @iommu_device: a pci device which represents the iommu for @dev. + * + * Return 0 for success, otherwise negative error value. + */ +int mdev_set_iommu_device(struct device *dev, struct device *iommu_device); + +struct device *mdev_get_iommu_device(struct device *dev); + /** * struct mdev_parent_ops - Structure to be registered for each parent device to * register the device to mdev module.