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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Add back xen-devel

On Fri, Aug 07, 2015 at 06:45:10PM +0800, Lai Jiangshan wrote:
> On Fri, Aug 7, 2015 at 6:25 PM, Wei Liu <wei.liu2@xxxxxxxxxx> wrote:
> > 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.
> 
> Thank you for sharing the important knowledge.
> 
> >
> > 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?
> 
> I need virtio-9pfs(share) & performance(pvh).
> Do we have other non-networking sharedfs/virtfs/... for pvh?
> 

There was  xenfs

  https://blog.xenproject.org/2009/03/26/status-of-xenfs/

but there is no active development. Not sure about its status nowadays.

We have an OPW intern working on virtio-9p on Xen at the moment. Let's
see how it goes.

Wei.

> thanks,
> Lai
> 
> >
> > 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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