[Xen-users] Re: What we support for xen4.0.0

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, May 17, 2010 at 11:55:41PM +0800, lei yang wrote:
>    Hi pasik,
> 
>    I can list some combination for the  xen, dom0 and domU kerne
> 
>    a.Xen 64 bit + dom0 64 bit + domU 64 bit
> 
>    b.Xen 64 bit + dom0 32 bit + domU 32 bit
> 
>    c.Xen 64 bit + dom0 64 bit + domU 32 bit
> 
>    d.Xen 64 bit + dom0 32 bit + domU 64 bit??
>    e.Xen 32 bit + dom0 32 bit + domU 32 bit
> 
>    f.can suppport  Xen 32 bit + 64 bit dom0 or 64 bit domU ???
> 
>    which is we not supported now. can you give me an explaination?
>

It's pretty simple when you realize dom0 is just a virtual machine (with some 
extra privileges and duties).

- 32bit Xen hypervisor (xen.gz) can run 32bit guests.
- 64bit Xen hypervisor (xen.gz) can run both 32bit and 64bit guests.

so.. if you have 64bit Xen, then you can have 32bit dom0 kernel or 64bit dom0 
kernel,
both are supported. Actually Citrix XenServer and XCP use 32bit dom0 kernel on 
64bit Xen.

If you use the traditional xen then it's easiest to build and install matching 
Xen and dom0.

The compatibility layer is Xen, not dom0. Was this clear enough? :)

-- Pasi
 
>    Thanks
>    Lei
> 
> 
> 
>    --
>    "We learn from failure, not from success!"

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