Re: [Xen-devel] Re: PV drivers on HVM using Xen 4.1.1

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2011-10-27 at 15:57 +0100, Alex Bligh wrote:
> 
> --On 27 October 2011 13:56:41 +0100 Alex Bligh <alex@xxxxxxxxxxx> wrote:
> 
> > I think I've found one reason why we can't get PV block drivers on HVM
> > domUs working on Xen 4.1.1 - whether we use a pvops or a xenlinux
> > domU kernel.
> >
> > We are using a line like:
> >
> >   disk = [ "tap:aio:/tmp/centos-pvd.img,xvda,w" ]
> >
> > We are using effectively a standard 3.0 kernel. Config options including
> > the word XEN are below.
> >
> > We do not see blktapctrl starting in Xen 4.1.1 dom0, but it does
> > start in Xen3.
> 
> The magic incantation to fix this here was:
>       modprobe xen_gntdev
> which for some reason is not modprobed in the startup script (Ubuntu
> one anyway).

I think 3.1 has patches to fix this in general (although I'm not sure
about this specific case).

> We now see pv block devices on hvm.

If you are using gntdev then are you running a qemu to provide the
backend?

Ian.


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