RE: [Xen-users] Intel VT dom0?

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

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Gabriel Rossetti
> Sent: 31 July 2006 23:09
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Intel VT dom0?
> 
> Hello,
> 
> I don't seem to be able to find any info on how to use Intel's VT cpu
> with XEN.
> Can I create a dom0 without having to recompile a
> Xen-enabled-linux-kernel? If so, how,
> where is the info? and then for domUs, how is that done? 
> Also, can I use
> Freebsd as a dom0 with an
> Intel VT version of Xen? (yes, I'm not trying to install 
> windows ;-)) I
> don't want to have a linux
> dom0 to control my FreeBSD domUs, and since I have an Intel VT CPU,
> might as well use it, no?
> I would really rather not patch my kernel...

No, this doesn't work: Dom0 (at the moment anyways) has to be
para-virtualized, since it's the domain that has access to the hardware,
and something needs to have REAL hardware access. All hardware (disk,
network, display, etc) in HVM (VT/SVM) domains are done through the
device model (qemu-dm), which collects the information on what the
device access amounts to (say a disk read, which is some 4-6 IO writes)
it's gathered up into a packet and processed as a regular file-read, and
then a fake interrupt is sent back to the guest, which then releases the
blocked thread and 256 IO read operation is done. 

--
Mats
> 
> Thanks,
> Gabriel
> 
> PS,
> I tried this url :
> http://xen.cosi.clarkson.edu/documentation/xen-tutorial.html
> because people on this list pointed to it a lot and it seams dead...
> 
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> 
> 
> 



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