Re: [Xen-API] XCP 1.5: Missing IOMMU- support

[Jóhann Ármann Fannberg <johannf@xxxxxxxxxx>]

Thanks James,

After a thorough check, I found that I had been mixing up the specs for 
i7-920 and i7-920-XM - the latter one supporting VT-d at a lower clock 
speed and a different socket. Seems that Intel does not support VT-d on 
i7 using the 3-channel socket 1366, and only one socket-2011: i7-3820.
Just a final issue: is the Intel TXT (Trusted Execution Technology) 
important for XEN HVM/PVM? Am planning to try out GPU-passthrough to 
Windows. That should conclude my speculations at this time.
Kind regards,

Johann.





Þann 6.9.2012 16:38, skrifaði James Bulpin:
> Johann wrote:
> > Bios menus:
> > I was wrong, the new bios (f13s) changed the menu item to
> > "Virtualization Technology" rather than the older Smart Virtualization.
> > The descriptive text is "When enabled, a VMM can utilize the additional
> > hardware capabilities provided by virtualization technology" (is this
> > text the only upgrade from f13 to f13s? ;-)
> OK, that's VT-x (VMX) then.
>
> > I assume you can have VMX support without having full VT-d support? At
> > least, this is what I will assume in my new request to Gigabyte.
> Correct. VMX has been around for longer than VT-d. VMX is necessary to run HVM 
> guests on Xen, but it only handles trapping certain privileged instructions. 
> VT-d adds support for DMA remapping and protection necessary for HVM guests to 
> utilise passed-through PCI hardware devices. Without VT-d you can still run HVM 
> guests with VMX but you won't be able to pass through PCI devices to them, 
> you'll have to use paravirtualised I/O.
>
> Cheers,
> James
>
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2012.0.2197 / Virus Database: 2437/5252 - Release Date: 09/06/12

_______________________________________________
Xen-api mailing list
Xen-api@xxxxxxxxxxxxx
http://lists.xen.org/cgi-bin/mailman/listinfo/xen-api