@@ -890,6 +890,31 @@ static struct vfio_device *vfio_device_get_from_name(struct vfio_group *group,
return device;
}
+struct vfio_device *vfio_device_get_from_fd(struct vfio_group *group,
+ int device_fd)
+{
+ struct fd f;
+ struct vfio_device *it, *device = ERR_PTR(-ENODEV);
+
+ f = fdget(device_fd);
+ if (!f.file)
+ return ERR_PTR(-EBADF);
+
+ mutex_lock(&group->device_lock);
+ list_for_each_entry(it, &group->device_list, group_next) {
+ if (it == f.file->private_data) {
+ device = it;
+ vfio_device_get(device);
+ break;
+ }
+ }
+ mutex_unlock(&group->device_lock);
+
+ fdput(f);
+ return device;
+}
+EXPORT_SYMBOL_GPL(vfio_device_get_from_fd);
+
/*
* Caller must hold a reference to the vfio_device
*/
@@ -15,6 +15,8 @@
#include <linux/poll.h>
#include <uapi/linux/vfio.h>
+struct vfio_group;
+
/**
* struct vfio_device_ops - VFIO bus driver device callbacks
*
@@ -50,6 +52,8 @@ extern int vfio_add_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 struct vfio_device *vfio_device_get_from_fd(struct vfio_group *group,
+ int device_fd);
extern void vfio_device_put(struct vfio_device *device);
extern void *vfio_device_data(struct vfio_device *device);
This patch introduces the support for getting VFIO device from VFIO device fd. With this support, it's possible for vhost to get VFIO device from the group fd and device fd set by the userspace. Signed-off-by: Tiwei Bie <tiwei.bie@intel.com> --- drivers/vfio/vfio.c | 25 +++++++++++++++++++++++++ include/linux/vfio.h | 4 ++++ 2 files changed, 29 insertions(+)