linux-kernel - Re: [RFC v3 0/5] virtio: support packed ring

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Message-ID: <31839145-3e87-2cc7-dfca-a09ae64b976a@redhat.com>
Date:   Wed, 2 May 2018 11:49:43 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Tiwei Bie <tiwei.bie@...el.com>, mst@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:     wexu@...hat.com, jfreimann@...hat.com
Subject: Re: [RFC v3 0/5] virtio: support packed ring



On 2018年04月25日 13:15, Tiwei Bie wrote:
> Hello everyone,
>
> This RFC implements packed ring support in virtio driver.
>
> Some simple functional tests have been done with Jason's
> packed ring implementation in vhost:
>
> https://lkml.org/lkml/2018/4/23/12
>
> Both of ping and netperf worked as expected (with EVENT_IDX
> disabled). But there are below known issues:
>
> 1. Reloading the guest driver will break the Tx/Rx;

It looks like the reason is we don't sync wrap counter information 
between host and qemu through VHOST_SET/GET_VRING_BASE. And both vhost 
and qemu need to do this through encoding warp counters to higher bits 
of vhost_vring_state.num,

Thanks