Intel Xeon E5620 CPU and VT-d (IOMMU) support?

Intel Xeon E5620 CPU and VT-d (IOMMU) support?

[Pasi Kärkkäinen]

Hello,

I'm planning to upgrade my testbox and I was checking for hardware options.
Can someone verify if Intel Xeon E5620 CPU supports (or doesn't support) VT-d IOMMU?

I'm asking because Intel website doesn't mention VT-d for E5620:
http://ark.intel.com/Product.aspx?id=47925

.. but it does for some (older) CPUs (E5520):
http://ark.intel.com/Product.aspx?id=40200

The chipset I'm planning to get (Intel 5520 Tylersburg) does have VT-d / IOMMU support listed.

Thanks!

-- Pasi

Re: Intel Xeon E5620 CPU and VT-d (IOMMU) support?

[Konrad Rzeszutek Wilk]

On Wed, Jun 02, 2010 at 07:40:07PM +0300, Pasi Kärkkäinen wrote:
> Hello,
> 
> I'm planning to upgrade my testbox and I was checking for hardware options.
> Can someone verify if Intel Xeon E5620 CPU supports (or doesn't support) VT-d IOMMU?
> 
> I'm asking because Intel website doesn't mention VT-d for E5620:
> http://ark.intel.com/Product.aspx?id=47925
> 
> .. but it does for some (older) CPUs (E5520):
> http://ark.intel.com/Product.aspx?id=40200
> 
> The chipset I'm planning to get (Intel 5520 Tylersburg) does have VT-d / IOMMU support listed.

So one thing I didn't know was that you need equivalant number of DMAR
entries for the IO-APICs on your motherboard. If you have three IO-APICs (like, this
SuperMicro X8something), you need three DMAR entries - mine only has
one. Which means that VT-d is turned off (Xen and both Linux baremetal
do this) as it can't do its magic on the other IO-APICs to re-route the IRQs
to the guest. You can hack the code to re-enable it, but then you must
disable the x2APIC.

Re: Intel Xeon E5620 CPU and VT-d (IOMMU) support?

[Andreas Olsowski]

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>From the Page you linked:
Intel® Virtualization Technology (VT-x)	Yes


> I'm asking because Intel website doesn't mention VT-d for E5620:
> http://ark.intel.com/Product.aspx?id=47925


-- 
Andreas Olsowski <andreas.olsowski@uni.leuphana.de>
Leuphana Universität Lüneburg
System- und Netzwerktechnik
Rechenzentrum, Geb 7, Raum 15
Scharnhorststr. 1
21335 Lüneburg

Tel: ++49 4131 / 6771309

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Re: Intel Xeon E5620 CPU and VT-d (IOMMU) support?

[Pasi Kärkkäinen]

On Thu, Jun 03, 2010 at 11:33:58AM +0200, Andreas Olsowski wrote:
> >From the Page you linked:
> Intel® Virtualization Technology (VT-x)	Yes
> 

Doesn't that mean the normal Intel VT/VMX (Xen HVM) ? 
VT-d (IOMMU) has been a separate item/feature.

-- Pasi

> 
> > I'm asking because Intel website doesn't mention VT-d for E5620:
> > http://ark.intel.com/Product.aspx?id=47925
> 
> 
> -- 
> Andreas Olsowski <andreas.olsowski@uni.leuphana.de>
> Leuphana Universität Lüneburg
> System- und Netzwerktechnik
> Rechenzentrum, Geb 7, Raum 15
> Scharnhorststr. 1
> 21335 Lüneburg
> 
> Tel: ++49 4131 / 6771309



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