Re: [Xen-devel] virtio on pv/pvh xen

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Aug 07, 2015 at 06:01:23PM +0800, Lai Jiangshan wrote:
> On Wed, Aug 5, 2015 at 11:33 PM, Wei Liu <wei.liu2@xxxxxxxxxx> wrote:
> > On Wed, Aug 05, 2015 at 11:09:41PM +0800, Lai Jiangshan wrote:
> >> Hi, Liu
> >>
> >> Does pv or pvh guest support virtio devices?
> >
> > No.
> >
> >> If yes, how can I configure the guest?
> >> If not, how can I make it support?
> >>
> >
> > A new transport which makes use of xenbus and grant table needs to be
> > developed.
> 
> I don't think pvh  need these.
> 

I think it still needs a new transport.

> Hi, Mukesh Rathor
> 
> Does pvh guest support virtio devices?
> 

Currently there are three transports available: virtio over pci, virtio
over mmio and virtio over channel I/O. They all seem to require some
sort of emulation support.

PVH doesn't have emulation support, which means you can't use existing
virtio transports.

If you want to add emulation to PVH, in effect it's just a HVM guest.
You can already use virtio over pci emulation on HVM guest today.

BTW can I ask why you want virtio support?

Wei.

> Thanks
> Lai
> 
> >
> > There were talks on standardising virtio and adding Xen PV transport
> > support long time ago but no visible progress was made.
> >
> > Wei.
> >
> >> Thanks
> >> Lai

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