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xen-users
RE: [Xen-users] Windows guest on non VT
Tomasz, sorry that you'll get this twice - didn't do Reply All on the
first attempt...
--
Mats
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> Tomasz Chmielewski
> Sent: 24 January 2007 10:14
> To: Suman K
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] Windows guest on non VT
>
> Suman K wrote:
> > From Xen Faq's:
> > Does Xen support Microsoft Windows?
> > The paravirtualized approach we use to get such high
> performance has not
> > been usable directly for Windows to date.
> >
> > Does this mean, can we run windows on non VT using the para
> virtualized?
> > If so, has anybody had success running windows on non VT,
> paravirtualized?
>
> No.
> This does mean that you CAN'T run Windows paravirtualized.
> This does mean that you CAN'T run Windows on non-VT CPUs.
>
That is indeed correct, assuming we include AMD Virtualization
Technology in "VT", then I agree completely.
Rumour has it that the guys behind Xen created a version of Windows that
ran on top of Xen, by having access to source-code from Microsoft (this
is available for "research purposes" if you can get a big enough
signatory of your university or such to sign the license agreement - not
trivial, but not impossible either, although special strict restrictions
apply to how you can use the source-code, with one for this purpose
important rule: None of the resulting code built from the source can
ever be distributed outside the labaratory without prior consent from
Microsoft - and that's on the far side of impossible!).
So what I'm saying is that it's not IMPOSSIBLE to create a PV version of
Windows - but unless you can get Microsoft to agree that it can be
distributed, you can't really let anyone outside your little group use
it. And of course, it's not very easy to modify the source-code of any
operating system even when you have source-code, you need to understand
exactly how different parts of it are used, etc, etc.
--
Mats
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