RE: [Xen-users] HVM questions

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Gregory Gee
> Sent: 10 July 2006 22:59
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] HVM questions
> 
> 
>   A few simple questions.
> 
> - How many VM can be setup for HVM?

As many as you can afford memory for. 
> 
> - Would it make sense to have more than one?
>  
> - I heard that PCI passthrough or what ever it is called  is not 
> supported in HVM. Is that a permanent limitation or will it 
> soon become 
> available?  Unfortunately, I need 1 Windows VM that can use dedicated 
> PCI card.  Since Windows is only supported in HVM, then this is why I 
> ask this question.

Yes, PCI passthrough is currently only supported for Para-virtual
guests. 
It is expected to be solved (there's no technical limitation for this,
just that someone has to write some code to support it, basically - and
the principle is not difficult - just fill in the PCI-table in the guest
so that the device looks like its there). There are some other
limitations tho'. If the PCI-card uses direct memory access, you'd need
to use a para-virtual driver (i.e a driver that is aware of the fact
that physical memory isn't where the guest-OS thinks it is). 

PIO-type card will work fine without special drivers - unfortunately,
very few PCI-cards are PIO-based... 
> 
> - I am seeing conflicting posts and wiki entries about AM2 Sempron 
> support for SVM.  Does the AM2 Sempron support HVM?

As far as I can tell from the rather poorly documented
feature-differences, Sempron will not support SVM, but all other RevF
products (Turion, Athlon64 and the to-be-released Opterons) do. Sorry
about that... 

--
Mats
> 
> Thanks,
> Greg
> 
> 
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