Re: [Xen-devel] Is fallback vhost_net to qemu for live migrate availableï

[Qin Chuanyu <qinchuanyu@xxxxxxxxxx>]

On 2013/9/2 15:57, Wei Liu wrote:
> On Sat, Aug 31, 2013 at 12:45:11PM +0800, Qin Chuanyu wrote:
> > On 2013/8/30 0:08, Anthony Liguori wrote:
> > > Hi Qin,
> > > > By change the memory copy and notify mechanism ïcurrently virtio-net with
> > > > vhost_net could run on Xen with good performanceã
> > > I think the key in doing this would be to implement a property
> > > ioeventfd and irqfd interface in the driver domain kernel.  Just
> > > hacking vhost_net with Xen specific knowledge would be pretty nasty
> > > IMHO.
> > Yes, I add a kernel module which persist virtio-net pio_addr and
> > msix address as what kvm module did. Guest wake up vhost thread by
> > adding a hook func in evtchn_interrupt.
> >
> > > Did you modify the front end driver to do grant table mapping or is
> > > this all being done by mapping the domain's memory?
> > There is nothing changed in front end driver. Currently I use
> > alloc_vm_area to get address spaceï and map the domain's memory as
> > what what qemu did.
> You mean you're using xc_map_foreign_range and friends in the backend to
> map guest memory? That's not very desirable as it violates Xen's
> security model. It would not be too hard to pass grant references
> instead of guest physical memory address IMHO.
In fact, I did what virtio-net have done in Qemu. I think security
is a pseudo question because Dom0 is under control.

Host could access memory of guest in KVM much easier than Xen,
but I hadn't heard someone said KVM is un-secret.

Regards
Qin chuanyu



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