From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Bader <stefan.bader@canonical.com>
Subject: Re: Re: PV drivers on HVM using Xen 4.1.1
Date: Thu, 27 Oct 2011 17:09:16 +0200
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To: Alex Bligh <alex@alex.org.uk>
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On 27.10.2011 16:57, Alex Bligh wrote:
> 
> 
> --On 27 October 2011 13:56:41 +0100 Alex Bligh <alex@alex.org.uk> 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.
> 
Hm, you mean in dom0? Strangely I do not have this loaded and still get pv disks
on hvm...

-Stefan