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

[Alex Bligh <alex@xxxxxxxxxxx>]

--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).

We now see pv block devices on hvm.

--
Alex Bligh

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