iommu/vfio: reset iova reserve context when close

If we don't reset the iova reserve context properly in
vfio_put_device_fio(), iova will incremently be growing even if
application closed the vfio fd and re-open it again.  To start from the
beginning, reset the context properly when closing the file.

Signed-off-by: Minwoo Im <minwoo.im@samsung.com>

Author: minwooim

src/iommu/vfio.c

@@ -618,6 +618,9 @@ static int vfio_put_device_fd(struct iommu_ctx *ctx, const char *bdf)
 
 			vfio->fd = -1;
 			vfio->iommu_set = false;
+			vfio->next = 0;
+			vfio->next_ephemeral = 0;
+			vfio->nephemerals = 0;
 		}
 	}