Pasi Kärkkäinen
2010-Jun-02 16:40 UTC
[Xen-devel] Intel Xeon E5620 CPU and VT-d (IOMMU) support?
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 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Konrad Rzeszutek Wilk
2010-Jun-02 18:02 UTC
Re: [Xen-devel] Intel Xeon E5620 CPU and VT-d (IOMMU) support?
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. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Andreas Olsowski
2010-Jun-03 09:33 UTC
Re: [Xen-devel] Intel Xeon E5620 CPU and VT-d (IOMMU) support?
>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 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Pasi Kärkkäinen
2010-Jun-03 09:49 UTC
Re: [Xen-devel] Intel Xeon E5620 CPU and VT-d (IOMMU) support?
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_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel