Re: [Qemu-devel] [PATCH v2] hw/virtio: fix vhost user fails to startup when MQ

[Jens Freimann]

On Fri, May 05, 2017 at 12:25:36AM +0800, Zhiyong Yang wrote:
>  Qemu2.7~2.9 and vhost user for dpdk 17.02 release work together
> to cause failures of new connection when negotiating to set MQ.
> (one queue pair works well).
>    Because there exist some bugs in qemu code when introducing
> VHOST_USER_PROTOCOL_F_REPLY_ACK to qemu. When vhost_user_set_mem_table
> is invoked to deal with the vhost message VHOST_USER_SET_MEM_TABLE
> for the second time, qemu indeed doesn't send the messge (The message
> needs to be sent only once)but still will be waiting for dpdk's reply
> ack, then, qemu is always freezing, while DPDK is always waiting for
> next vhost message from qemu.
>   The patch aims to fix the bug, MQ can work well.
>   The same bug is found in function vhost_user_net_set_mtu, it is fixed
> at the same time.
>   DPDK related patch is as following:
>   http://www.dpdk.org/dev/patchwork/patch/23955/
> 
> Signed-off-by: Zhiyong Yang <address@hidden>

Tested-by: Jens Freimann <address@hidden>