[RFC PATCH 1/5] vfio: Add a helper to retrieve kvm instance from a dev

[Shameer Kolothum]

A device that belongs to vfio_group has the kvm instance associated
with it. Retrieve it.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi at huawei.com>
---
 drivers/vfio/vfio.c  | 12 ++++++++++++
 include/linux/vfio.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 2151bc7f87ab..d1968e4bf9f4 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -876,6 +876,18 @@ struct vfio_device *vfio_device_get_from_dev(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(vfio_device_get_from_dev);
 
+struct kvm *vfio_kvm_get_from_dev(struct device *dev)
+{
+	struct vfio_group *group;
+
+	group = vfio_group_get_from_dev(dev);
+	if (!group)
+		return NULL;
+
+	return group->kvm;
+}
+EXPORT_SYMBOL_GPL(vfio_kvm_get_from_dev);
+
 static struct vfio_device *vfio_device_get_from_name(struct vfio_group *group,
 						     char *buf)
 {
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 38d3c6a8dc7e..8716298fee27 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -56,6 +56,7 @@ 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);
 extern void *vfio_device_data(struct vfio_device *device);
+extern struct kvm *vfio_kvm_get_from_dev(struct device *dev);
 
 /**
  * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
-- 
2.17.1