linux-kernel - [PATCH v2 1/2] vfio: report group noiommu status

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Date:   Tue, 30 Aug 2016 05:27:14 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jason Wang <jasowang@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Cornelia Huck <cornelia.huck@...ibm.com>,
        virtualization@...ts.linux-foundation.org, qemu-devel@...gnu.org,
        kvm@...r.kernel.org
Subject: [PATCH v2 1/2] vfio: report group noiommu status

When using vfio, callers might want to know whether device is added
to a regular group or an non-iommu group.

Report this status from vfio_is_noiommu_group_dev.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 include/linux/vfio.h |  2 ++
 drivers/vfio/vfio.c  | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 0ecae0b..584757b 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -51,6 +51,8 @@ extern int vfio_add_group_dev(struct device *dev,
 			      const struct vfio_device_ops *ops,
 			      void *device_data);
 
+extern bool vfio_is_noiommu_group_dev(struct device *dev);
+
 extern void *vfio_del_group_dev(struct device *dev);
 extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);
 extern void vfio_device_put(struct vfio_device *device);
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index d1d70e0..22f279f 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -872,6 +872,18 @@ static bool vfio_dev_present(struct vfio_group *group, struct device *dev)
 }
 
 /*
+ * Is device part of a noiommu group?
+ * Note: must call vfio_add_group_dev first.
+ */
+bool vfio_is_noiommu_group_dev(struct device *dev)
+{
+	struct vfio_device *device = dev_get_drvdata(dev);
+	struct vfio_group *group = device->group;
+
+	return group->noiommu;
+}
+
+/*
  * Decrement the device reference count and wait for the device to be
  * removed.  Open file descriptors for the device... */
 void *vfio_del_group_dev(struct device *dev)
-- 
MST