Re: [dpdk-dev] vhost: Problem RESET_OWNER processing

["Ouyang, Changchun" <changchun.ouyang@intel.com>]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Jan Kiszka
> Sent: Friday, August 7, 2015 10:04 PM
> To: dev@dpdk.org; Xie, Huawei
> Subject: [dpdk-dev] vhost: Problem RESET_OWNER processing
> 
> Hi,
> 
> I was wondering if I'm alone with this: the vhost-switch example crashes on
> client disconnects if the client send a RESET_OWNER message. That's at least
> the case for QEMU and vhost-user mode (I suppose vhost-cuse is legacy

What's your qemu version?

> now). And it really ruins the party when playing with this because every VM
> shutdown or guest reboot triggers.
> 
> I was looking deeper in the librte_vhost, and I found that reset_owner() is
> doing cleanup_device and then init_device - but without letting the user
> know. So vhost-switch crashed in its main loop over continuing to use the
> device, namely calling rte_vhost_dequeue_burst (with
> dev->virtqueue[]->avail == NULL).
> 
> Do we simply need another hook in the vhost API, similar to the destruction
> notification?
> 
> Jan
> 
> --
> Siemens AG, Corporate Technology, CT RTC ITP SES-DE Corporate
> Competence Center Embedded Linux