linux-kernel - RE: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

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Date:   Wed, 11 Apr 2018 01:38:29 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     "Liang, Cunming" <cunming.liang@...el.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
CC:     "Duyck, Alexander H" <alexander.h.duyck@...el.com>,
        "virtio-dev@...ts.oasis-open.org" <virtio-dev@...ts.oasis-open.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "Wang, Xiao W" <xiao.w.wang@...el.com>,
        "ddutile@...hat.com" <ddutile@...hat.com>,
        "Tan, Jianfeng" <jianfeng.tan@...el.com>,
        "Wang, Zhihong" <zhihong.wang@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: RE: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware
        vhost backend

> From: Liang, Cunming
> Sent: Tuesday, April 10, 2018 10:24 PM
> 
[...]
> >
> > As others said, we do not need to go overeboard. A couple of small
> vendor-
> > specific quirks in qemu isn't a big deal.
> 
> It's quite challenge to identify it's small or not, there's no uniform metric.
> 
> It's only dependent on QEMU itself, that's the obvious benefit. Tradeoff is
> to build the entire device driver. We don't object to do that in QEMU, but
> wanna make sure to understand the boundary size clearly.
> 

It might be helpful if you can post some sample code using proposed 
framework - then people have a clear feeling about what size is talked 
about here and whether it falls into the concept of 'small quirks'.

Thanks
Kevin