* Intel Xeon E5620 CPU and VT-d (IOMMU) support?
@ 2010-06-02 16:40 Pasi Kärkkäinen
2010-06-02 18:02 ` Konrad Rzeszutek Wilk
2010-06-03 9:33 ` Andreas Olsowski
0 siblings, 2 replies; 4+ messages in thread
From: Pasi Kärkkäinen @ 2010-06-02 16:40 UTC (permalink / raw)
To: xen-devel
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
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Intel Xeon E5620 CPU and VT-d (IOMMU) support?
2010-06-02 16:40 Intel Xeon E5620 CPU and VT-d (IOMMU) support? Pasi Kärkkäinen
@ 2010-06-02 18:02 ` Konrad Rzeszutek Wilk
2010-06-03 9:33 ` Andreas Olsowski
1 sibling, 0 replies; 4+ messages in thread
From: Konrad Rzeszutek Wilk @ 2010-06-02 18:02 UTC (permalink / raw)
To: Pasi Kärkkäinen; +Cc: xen-devel
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.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Intel Xeon E5620 CPU and VT-d (IOMMU) support?
2010-06-02 16:40 Intel Xeon E5620 CPU and VT-d (IOMMU) support? Pasi Kärkkäinen
2010-06-02 18:02 ` Konrad Rzeszutek Wilk
@ 2010-06-03 9:33 ` Andreas Olsowski
2010-06-03 9:49 ` Pasi Kärkkäinen
1 sibling, 1 reply; 4+ messages in thread
From: Andreas Olsowski @ 2010-06-03 9:33 UTC (permalink / raw)
To: xen-devel
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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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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Intel Xeon E5620 CPU and VT-d (IOMMU) support?
2010-06-03 9:33 ` Andreas Olsowski
@ 2010-06-03 9:49 ` Pasi Kärkkäinen
0 siblings, 0 replies; 4+ messages in thread
From: Pasi Kärkkäinen @ 2010-06-03 9:49 UTC (permalink / raw)
To: Andreas Olsowski; +Cc: xen-devel
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
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2010-06-03 9:49 UTC | newest]
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-- links below jump to the message on this page --
2010-06-02 16:40 Intel Xeon E5620 CPU and VT-d (IOMMU) support? Pasi Kärkkäinen
2010-06-02 18:02 ` Konrad Rzeszutek Wilk
2010-06-03 9:33 ` Andreas Olsowski
2010-06-03 9:49 ` Pasi Kärkkäinen
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