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Subject[RFC PATCH 08/10] vfio/mdev: Set iommu ops for mdev bus
Date
This sets the iommu ops for the mdev bus with iommu_set_bus().
With the iommu ops setting, a mediated device might be isolated
and protected by an IOMMU unit.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/vfio/mdev/mdev_core.c | 9 ++++++++-
drivers/vfio/mdev/mdev_driver.c | 10 ++++++++++
2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 0212f0e..d8f19ba 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -16,6 +16,7 @@
#include <linux/uuid.h>
#include <linux/sysfs.h>
#include <linux/mdev.h>
+#include <linux/iommu.h>

#include "mdev_private.h"

@@ -392,7 +393,13 @@ int mdev_device_remove(struct device *dev, bool force_remove)

static int __init mdev_init(void)
{
- return mdev_bus_register();
+ int ret;
+
+ ret = mdev_bus_register();
+ if (!ret)
+ iommu_set_bus(&mdev_bus_type);
+
+ return ret;
}

static void __exit mdev_exit(void)
diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.c
index 6f0391f..76ac9e6 100644
--- a/drivers/vfio/mdev/mdev_driver.c
+++ b/drivers/vfio/mdev/mdev_driver.c
@@ -21,6 +21,13 @@ static int mdev_attach_iommu(struct mdev_device *mdev)
int ret;
struct iommu_group *group;

+ /*
+ * If iommu_ops is set for bus, add_device() will allocate
+ * a group and add the device in the group.
+ */
+ if (iommu_present(mdev->dev.bus))
+ return 0;
+
group = iommu_group_alloc();
if (IS_ERR(group))
return PTR_ERR(group);
@@ -36,6 +43,9 @@ static int mdev_attach_iommu(struct mdev_device *mdev)

static void mdev_detach_iommu(struct mdev_device *mdev)
{
+ if (iommu_present(mdev->dev.bus))
+ return;
+
iommu_group_remove_device(&mdev->dev);
dev_info(&mdev->dev, "MDEV: detaching iommu\n");
}
--
2.7.4
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