Re: [PATCH V4 4/6] mdev: introduce virtio device and its device ops

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On 2019/10/18 上午1:53, Alex Williamson wrote:
On Thu, 17 Oct 2019 18:48:34 +0800
Jason Wang<jasowang@xxxxxxxxxx>  wrote:

This patch implements basic support for mdev driver that supports
virtio transport for kernel virtio driver.

Signed-off-by: Jason Wang<jasowang@xxxxxxxxxx>
---
  drivers/vfio/mdev/mdev_core.c |  12 +++
  include/linux/mdev.h          |   4 +
  include/linux/virtio_mdev.h   | 151 ++++++++++++++++++++++++++++++++++
  3 files changed, 167 insertions(+)
  create mode 100644 include/linux/virtio_mdev.h

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index d0f3113c8071..5834f6b7c7a5 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -57,6 +57,18 @@ void mdev_set_vfio_ops(struct mdev_device *mdev,
  }
  EXPORT_SYMBOL(mdev_set_vfio_ops);
+/* Specify the virtio device ops for the mdev device, this
+ * must be called during create() callback for virtio mdev device.
+ */
+void mdev_set_virtio_ops(struct mdev_device *mdev,
+			 const struct virtio_mdev_device_ops *virtio_ops)
+{
+	BUG_ON(mdev->class_id);
Nit, this one is a BUG_ON, but the vfio one is a WARN_ON.  Thanks,

Alex


Let me fix in next version.

Thanks

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