From patchwork Thu Jun 11 12:15:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 11599883 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C516B739 for ; Thu, 11 Jun 2020 12:10:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B58B62081A for ; Thu, 11 Jun 2020 12:10:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728268AbgFKMKG (ORCPT ); Thu, 11 Jun 2020 08:10:06 -0400 Received: from mga03.intel.com ([134.134.136.65]:19245 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728124AbgFKMJQ (ORCPT ); Thu, 11 Jun 2020 08:09:16 -0400 IronPort-SDR: m0t2WJAyq/xqH4iOBRK7OPvPRvZvhLpLF1nC0z5zjCm+wf4TDpyjzaakkwgr4w1M6FO2rrLoB3 wXZZ4Qhwqzww== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jun 2020 05:09:10 -0700 IronPort-SDR: nL+qRrGATF8v4bFxG54vp1mxoLYcw24qUlGeXSvAnPvmy2uKYDGsLL8qI2XuOiW6k4cmoELGBX cr7X+gUxrWiA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,499,1583222400"; d="scan'208";a="419082499" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga004.jf.intel.com with ESMTP; 11 Jun 2020 05:09:10 -0700 From: Liu Yi L To: alex.williamson@redhat.com, eric.auger@redhat.com, baolu.lu@linux.intel.com, joro@8bytes.org Cc: kevin.tian@intel.com, jacob.jun.pan@linux.intel.com, ashok.raj@intel.com, yi.l.liu@intel.com, jun.j.tian@intel.com, yi.y.sun@intel.com, jean-philippe@linaro.org, peterx@redhat.com, hao.wu@intel.com, iommu@lists.linux-foundation.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 12/15] vfio/type1: Add vSVA support for IOMMU-backed mdevs Date: Thu, 11 Jun 2020 05:15:31 -0700 Message-Id: <1591877734-66527-13-git-send-email-yi.l.liu@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1591877734-66527-1-git-send-email-yi.l.liu@intel.com> References: <1591877734-66527-1-git-send-email-yi.l.liu@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Recent years, mediated device pass-through framework (e.g. vfio-mdev) is used to achieve flexible device sharing across domains (e.g. VMs). Also there are hardware assisted mediated pass-through solutions from platform vendors. e.g. Intel VT-d scalable mode which supports Intel Scalable I/O Virtualization technology. Such mdevs are called IOMMU- backed mdevs as there are IOMMU enforced DMA isolation for such mdevs. In kernel, IOMMU-backed mdevs are exposed to IOMMU layer by aux-domain concept, which means mdevs are protected by an iommu domain which is auxiliary to the domain that the kernel driver primarily uses for DMA API. Details can be found in the KVM presentation as below: https://events19.linuxfoundation.org/wp-content/uploads/2017/12/\ Hardware-Assisted-Mediated-Pass-Through-with-VFIO-Kevin-Tian-Intel.pdf This patch extends NESTING_IOMMU ops to IOMMU-backed mdev devices. The main requirement is to use the auxiliary domain associated with mdev. Cc: Kevin Tian CC: Jacob Pan CC: Jun Tian Cc: Alex Williamson Cc: Eric Auger Cc: Jean-Philippe Brucker Cc: Joerg Roedel Cc: Lu Baolu Signed-off-by: Liu Yi L --- v1 -> v2: *) check the iommu_device to ensure the handling mdev is IOMMU-backed drivers/vfio/vfio_iommu_type1.c | 30 +++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index c233c8e..bcd7935 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -2041,13 +2041,27 @@ static int vfio_iommu_resv_refresh(struct vfio_iommu *iommu, return ret; } +static struct device *vfio_get_iommu_device(struct vfio_group *group, + struct device *dev) +{ + if (group->mdev_group) + return vfio_mdev_get_iommu_device(dev); + else + return dev; +} + static int vfio_dev_bind_gpasid_fn(struct device *dev, void *data) { struct domain_capsule *dc = (struct domain_capsule *)data; struct iommu_gpasid_bind_data *bind_data = (struct iommu_gpasid_bind_data *) dc->data; + struct device *iommu_device; + + iommu_device = vfio_get_iommu_device(dc->group, dev); + if (!iommu_device) + return -EINVAL; - return iommu_sva_bind_gpasid(dc->domain, dev, bind_data); + return iommu_sva_bind_gpasid(dc->domain, iommu_device, bind_data); } static int vfio_dev_unbind_gpasid_fn(struct device *dev, void *data) @@ -2055,8 +2069,13 @@ static int vfio_dev_unbind_gpasid_fn(struct device *dev, void *data) struct domain_capsule *dc = (struct domain_capsule *)data; struct iommu_gpasid_unbind_data *unbind_data = (struct iommu_gpasid_unbind_data *) dc->data; + struct device *iommu_device; + + iommu_device = vfio_get_iommu_device(dc->group, dev); + if (!iommu_device) + return 0; - iommu_sva_unbind_gpasid(dc->domain, dev, unbind_data); + iommu_sva_unbind_gpasid(dc->domain, iommu_device, unbind_data); return 0; } @@ -2587,8 +2606,13 @@ static int vfio_dev_cache_invalidate_fn(struct device *dev, void *data) struct domain_capsule *dc = (struct domain_capsule *)data; struct iommu_cache_invalidate_info *cache_info = (struct iommu_cache_invalidate_info *) dc->data; + struct device *iommu_device; + + iommu_device = vfio_get_iommu_device(dc->group, dev); + if (!iommu_device) + return -EINVAL; - iommu_cache_invalidate(dc->domain, dev, cache_info); + iommu_cache_invalidate(dc->domain, iommu_device, cache_info); return 0; }