Re: [Xen-devel] Via Nano X2 Support, cont'd?

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.05.12 at 10:46, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
>>>> On 19.05.12 at 22:00, Sam Mulvey <sam@xxxxxxxxxxxxxxxxxxxx> wrote:
>> Recently got a Via VE-900 board.   It has a via nano x2 chip on it, and 
>> suggests that it has Intel-compatible virtualization extensions.   Has 
>> anyone 
> 
>> worked with this board yet?   I thought it would be nice to have a 
>> lower-powered, nearly silent Xen machine sitting on my desk.
> 
> Looking around a little on their website, they don't seem to
> publish proper specifications. Without that, and neither having
> access to a respective system to actually test eventual changes,
> it would be rather presumptuous to try to extend Xen to support
> this. (As a side note, we're in feature freeze right now anyway,
> so this could only be done for 4.3 anyway.)
> 
> I submitted a request for access to full documentation to them,
> but based on past experience I'm not having much hope that any
> response will show up (not to speak of a positive one).

They responded quite quickly, but won't get full information out
without requiring an NDA for the moment (but they indicated to
work on lifting that restriction).

>> I've got it booting into Xen 4.1.2 and running PV dom0's, but I'm not able 
>> to load any HVM domains.    I posted this question first on Xen-users, and I 
>> was asked if I was able to get KVM or VirtualBox working-- I've tried KVM 
>> and 
>> managed to get it booting into a Linux livecd and a Windows installer.
> 
> That can likely be taken as confirmation of above statement about
> being (reasonably) compatible with an already existing HVM
> implementation.

They did confirm that part, by quoting the relevant pieces from
their doc. This together with the Linux bits to enable 64-bit
support on those CPUs result in the attached patch (on top of
current -unstable, and requiring to either drop the hunk changing
xen/arch/x86/hvm/nestedhvm.c, or to apply the patch at
http://lists.xen.org/archives/html/xen-devel/2012-05/msg01830.html
upfront. Would you be willing/able to give this a try?

Jan

Attachment: x86-centaur-64bit-hvm.patch
Description: Text document

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