linux-kernel - [RFC PATCH v2 10/10] vfio/type1: Attach domain for mdev group

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Date:   Thu, 30 Aug 2018 12:09:22 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>
Cc:     ashok.raj@...el.com, sanjay.k.kumar@...el.com,
        jacob.jun.pan@...el.com, kevin.tian@...el.com,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        yi.l.liu@...el.com, yi.y.sun@...el.com, peterx@...hat.com,
        tiwei.bie@...el.com, iommu@...ts.linux-foundation.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [RFC PATCH v2 10/10] vfio/type1: Attach domain for mdev group

When attaching domain to a group of mediated devices which
all have the domain type attributes set to ATTACH_PARENT,
we should attach domain to the parent PCI device instead
of mdev device itself.

Cc: Ashok Raj <ashok.raj@...el.com>
Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: Kevin Tian <kevin.tian@...el.com>
Cc: Liu Yi L <yi.l.liu@...el.com>
Signed-off-by: Sanjay Kumar <sanjay.k.kumar@...el.com>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/vfio/vfio_iommu_type1.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 64bf55b91de1..c4231df44304 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1411,6 +1411,18 @@ static int vfio_mdev_domain_type(struct device *dev, void *data)
 	return -EINVAL;
 }
 
+static int vfio_parent_bus_type(struct device *dev, void *data)
+{
+	struct bus_type **bus = data;
+
+	if (*bus && *bus != dev->parent->bus)
+		return -EINVAL;
+
+	*bus = dev->parent->bus;
+
+	return 0;
+}
+
 static int vfio_iommu_type1_attach_group(void *iommu_data,
 					 struct iommu_group *iommu_group)
 {
@@ -1458,6 +1470,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
 		enum mdev_domain_type type = 0;
 
 		symbol_put(mdev_bus_type);
+		mdev_bus = NULL;
 
 		/* Determine the domain type: */
 		ret = iommu_group_for_each_dev(iommu_group, &type,
@@ -1479,7 +1492,14 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
 
 			return 0;
 		case DOMAIN_TYPE_ATTACH_PARENT:
-		/* FALLTHROUGH */
+			bus = NULL;
+			group->attach_parent = true;
+			/* Set @bus to bus type of the parent: */
+			ret = iommu_group_for_each_dev(iommu_group, &bus,
+						       vfio_parent_bus_type);
+			if (ret)
+				goto out_free;
+			break;
 		default:
 			ret = -EINVAL;
 			goto out_free;
-- 
2.17.1