Re: [PATCH net v2 1/3] vsock/virtio: enable VQs early on probe

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On Wed, Mar 23, 2022 at 01:44:42PM +0000, Stefan Hajnoczi wrote:
On Wed, Mar 23, 2022 at 09:49:52AM +0100, Stefano Garzarella wrote:
virtio spec requires drivers to set DRIVER_OK before using VQs.
This is set automatically after probe returns, but virtio-vsock
driver uses VQs in the probe function to fill rx and event VQs
with new buffers.

Let's fix this, calling virtio_device_ready() before using VQs
in the probe function.

Fixes: 0ea9e1d3a9e3 ("VSOCK: Introduce virtio_transport.ko")
Signed-off-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
---
 net/vmw_vsock/virtio_transport.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index 5afc194a58bb..b1962f8cd502 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -622,6 +622,8 @@ static int virtio_vsock_probe(struct virtio_device *vdev)
 	INIT_WORK(&vsock->event_work, virtio_transport_event_work);
 	INIT_WORK(&vsock->send_pkt_work, virtio_transport_send_pkt_work);

+	virtio_device_ready(vdev);

Can rx and event virtqueue interrupts be lost if they occur before we
assign vdev->priv later in virtio_vsock_probe()?

Yep, as Michael suggested I'll fix the patch order in the next version.

Thanks,
Stefano




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