Which chipsets support VT-d?

Which chipsets support VT-d?

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Hi!

I would like to set up a Linux machine, being able to run Windows via Xen in parallel to play some games. According to http://wiki.xensource.com/xenwiki/XenFaq 7.3 the usage of 3D graphics in DomU is not possible. But point 3 of section 7.3 says that IOMMU would enable this feature. Since VT-d is Intel's equivalent to IOMMU, I would like to buy a mainboard supporting this technology.

Now it is hard to point out which chipsets support VT-d. The appropriate VT-d doc of Xen ( http://lxr.xensource.com/lxr/source/docs/misc/vtd.txt ) only references some sample mainboards and machines, these only seem to be such with Q35 chipset / vPro.
A vmware presentation ( http://communities.vmware.com/servlet/JiveServlet/download/702997-1574/N... Slide 15) says, that Seaburg and Bearlake chipsets would support VT-d - but Bearlake would not only include Q35, but also P35, X38, ...

So please could someone lighten up this a bit?

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Bild des Benutzers Steven Thomsen (Intel)

The chipsets supporting VT-d, are "Bearlake" and "Seaburg". To my knowledge the -B -G and -X refer to various supported SKU options available for the Bearlake, including cache and cpu cores (ex. dual vs quad).

Bearlake and Seaburg are north bridges in the platform, they handle the DMA remapping capability within the chipset (see the VT-d public specifcation etc.). The suffix is more about the SKU fusing than the fundamental chipset capabilities.

Enabling the chipset in BIOS does not guarantee the kernel/OS/VMM is properly configured/compiled to support it.

Xen 3.2 final (released last week) has support for VT-d and tboot (trusted boot).

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Dear MADsathomse,

thank you for your reply. I am also interested in the VT-d technology. Anyhow I must admit the question was not really cleared up for me. From your post I get the message that all Bearlake and Seaburg chipsets will support VT-d. Nevertheless this document http://www.intel.com/design/chipsets/datashts/316966.htm, page 33 does not say so. It reads "Intel VT-d is only supported by the Intel Q35 Express
chipset." which would exclude the Q33, G33 and P35 based platforms. Could you please clarify your statements a bit?

Thank you in advance.

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Are these chipsets available in market? Can I buy a server with vt-d capability today?


Thanks,


Vivek.

Bild des Benutzers Radhakrishna Hiremane Shridhar (Intel)

Xeon 5400 (DP) or Xeon 3200/3210 (UP)based chipset have VT-d technology. VT-d requires BIOS enabling. Please check with the OEMs offering servers and WS based on Xeon 5400 or Xeon 3200/3210 chipsets if they have the VT-d enabled in the BIOS.


Bild des Benutzers vivek_kapadia

Thanks MADhradhakr, this is useful.


Vivek.

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Hello, MAD.

What about Bearlake or Seaburg chipsets VT-d support?

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I would also like a clarification on that one. The series 3 chipset specs state that only the Q35 supports VT-D. The X38 chipset specs contain the string "vt-d" in a chipset configuration table, so i guess someone just copy&pasted it in... or does the X38 support vt-d and people just forgot to mention it?

Some (external) news also state that Eaglelake will have vt-d support, but it'll only arrive 2008Q2

I'd specifically like to know whether the P35 supports vt-d, as it supports DDR3, as opposed to the Q35. It's frustrating that there are no good sources indicating this capability anywhere...

So, a comprehensive list of chipsets that do support vt-d and those that will be released in the near future would be nice.

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I have been puzzled over this myself. Thanks for the help!

Bild des Benutzers Craig Watkins (Intel)

I asked this question recently for Intel Desktop Boards, and the answer I got back was:


VT-d is enabled on the following chipsets:


Intel Q35 GMCH with ICH9 DO (Bearlake chipset)


The following chipsets have VT-d capability, but OEMs may not have enabled in systems based on these:


Intel X38


Intel X48


VT-d will be enabled on these future products:


Intel Q45 (Eaglelake)


For Intel Desktop Boards, these have VT-d support enabled:


Intel DQ35JO


Intel DQ35MP


Intel DX38BT


Intel DX48BT2


These future Intel Desktop Boards will have VT-d support:


Intel DQ45CB


Intel DQ45EK

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Thanks for this great update!
Is there any information when Q45 or in this case the DQ45CB/DQ45CB will be on the market?

I caught some specs here indicating availability in 2Q2008, but from other sources I saw that Q45 will not be available before the second half of 2008, maybe even fall...

Except for the integrated graphics (X3100 vs X3500) and AMT capabilities (3.0 vs 5.0) what will be major differences between Q35 and Q45, especially when looking for virtualization (Xen) support?


Thanks,
Raz

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I'd like some further info on VT-d as well. Most of the information on Intel's website is high level marketing speak. The only place I could find device specific information was this thread and the VT-d wiki on Xen's site. I looked at the Asus P5E-VM DO motherboard manual, and VT-d is specifically mentioned as a bios option. I would like to know if the upcoming P45 chipset will support VT-d as opposed to the Q45. Why doesn't Intel have a product matrix so that we can easily find chipsets that support VT-d? The authoritative source of this information shouldn't be coming from forum threads and wikis.

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Does any one know if the D5400XS (SkullTrail) board supports VT?

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Sorry if this is a bit of a noob question but have been following this thread and now understand that the Q45 will have vt-d support and an X3500 graphics engine whereas the G45 will not have vt-d but will have an X3500HD graphics engine. The HD is important for me as part of a home media solution (but would still like vt-d). Does the vt-d support in the Q45 allow vt-d graphics mapping from a dedicated gfx card rather than through the onboard gfx?

Thanks

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@jjrev: According to mails in the XEN mailing list all 5400 boards support VT-d but again, it might be a matter of the BIOS. Is there any reference in (BIOS section of) the manual?

@bejam: In theory yes, however I'm not aware of any success yet. I saw people trying this with XEN, but PCI-e passthrough seems to lack some GFX optimizations so far. Another issue could be the closed source drivers from manufacturers like ATI and nVidia. (Praise Intel for their Open Source drivers!)


Best regards,
Razor

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I have a D5400XS board running the latest (0926) BIOS and it doesn't give an option to enable VT.

After contacting Intel support they informed me the board definitely supports VT, and I must not have the option because my CPU didn't support VT. They then included a hyperlink to a page on intel.com that showed my CPU was VT capable...

I find it difficult to believe that a combination of D5400XS and E5320 doesn't support VT properly. Anyone else having the same problem, or found a solution?

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I spoke with a SkullTrail BIOS engineer and was assured that a VT enabled BIOS is in the works for the D5400XS. No ETA though..

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I [perhaps naively] re-raised the call with Intel about this, and was told that although the E5320 does support VT, it's "not supported" on the D5400XS, and tha I should buy a CPU listed on http://processormatch.intel.com/CompDB/SearchResult.aspx?Boardname=d5400xs and all would be fine.

So, silly me, went and purchased a CPU from that list and guess what? It still doesn't offer VT support.

So one snotty email to Intel support later and 554.68 down, I'll listen to your advice and await a BIOS update that enables a feature that, according to Intel's own site, the motherboard already supports.

Grrrr.

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Well, I received an email from EMEA support saying v1140 of the BIOS supports VT. Upgraded and all is now working fine.

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Sorry to raise this question again, but I need to know if the Intel Entry Server Board S3210SHLX (3210 chipset) supports VT-d. I asked the Reseller and they did not know. Does anyone know at least where to ask? I seem to get lost browsing around the Intel site.

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The only current server chipset which supports VT-d is the successor of the 5000p (server)chipset (by the codename Blackford), codenamed Seaburg or 5400 chipset (http://www.intel.com/products/chipsets/5400/index.htm).

The Intel 5400 chipset is designed for systems based on the Intel processors Dual Core Intel Xeon Processor 5100 series, Quad-Core Intel Xeon Processor 5300 series, Quad-Core Intel Xeon Processor 5400 series, and Dual-Core Intel Xeon Processor 5200 series

So, watch out, there is an Intel 5400 series chipset (aka Seaburg) AND there is a Intel Xeon Processor 5400 series (aka Harpertown). Intel just wants to confuse us :-)

Here is a site with all the Intel Processors listed which support VT (VT-d is NOT specifically referred to!!):
http://compare.intel.com/pcc/default.aspx?familyid=5&culture=en-US&iid=p...

This link compares the 5000p server chipset (no VT support!) and the 5400 server chipset (with VT support):
http://compare.intel.com/pcc/showchart.aspx?mmID=24664,28047&familyID=9&...

So, virtually all current Xeon processors support VT, but currently only one chipset (5400 aka Seaburg) support VT-d. It should be noted, that the BIOS also should allow it to enable VT. And even then, when all three conditions are met, there is no guarantee that it will work flawlessly.

The equivalent of the Seaburg (5400) server chipset for the desktop PCs is the Q35 chipset aka Bearlake-Q, with VT-d support. All other Bearlake variants in the 3-Series chipset do NOT support VT-d, as far as I know.

This is what I understand after I dug into this. I may be wrong, so anyone who can amend my above deliberations, please do so.

To respond to your question: no I don't think your server board with 3210 chipset supports VT-d.

Bild des Benutzers Steven Thomsen (Intel)


Here is the list of production platforms that has VT-d on it.



Stoakley (Seaburg) chipset based platforms that has VT-d1 on it:



HP XW8600:


http://h10010.www1.hp.com/wwpc/us/en/sm/WF25a/12454-12454-296719-307907-296721-3432827.html



Dell T5400


http://www.dell.com/content/products/productdetails.aspx/precn_t5400?c=us&cs=04&l=en&s=bsd&~tab=bundlestab



SuperMicro based on 5400:


http://www.supermicro.com/products/motherboard/Xeon1333/5400/X7DWN+.cfm


http://www.supermicro.com/products/motherboard/Xeon1333/5400/X7DWN+.cfm



Weybridge platforms:


For Weybridge, VT-d is productized by Intel only on vPro branded client platforms. Below is a list of such platforms, supporting VT-d, offered by HP, Dell, Acer, Intel board, Lenovo etc. I dont believe SuperMicro carries vPro branded boxes, so we dont know if the SuperMicro BIOS enables VT-d properly on their Weybridge offerings.



* HP Compaq DC7800 series of desktop computers


http://h10010.www1.hp.com/wwpc/us/en/en/WF04a/12454-12454-64287-321860-3328898.html



* Dell Optiplex 755 desktop computers


http://www.dell.com/content/products/category.aspx/optix?c=us&cs=555&l=en&s=biz



* ACER vPro system Veriton T661/M661/S661


http://global.acer.com/products/desktop/index.htm


* Intel board with Intel Q35 chipset (supporting Intel VT-d)


http://www.intel.com/products/desktop/motherboard/index.htm?iid=desk_nav+board



* Lenovo ThinkCentre M57p series desktop computers


http://shop.lenovo.com/SEUILibrary/controller/e/web/LenovoPortal/en_US/catalog.workflow:category.details?current-catalog-id=12F0696583E04D86B9B79B0FEC01C087&current-category-id=61CEC07394744CFCA553147261AEA6F7ThinkCentre



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Stev, you are referring to VT-d1 in your below posting. What is the difference between VT-d and VT-d1?

MADsathomse: .......Stoakley (Seaburg) chipset based platforms that has VT-d1 on it......

Bild des Benutzers Steven Thomsen (Intel)

sorry, typo..... Should have been VT-d

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But did you know, that VT-d2 exists? Stands for "Interrupt remapping". See link (page 5 of the pdf file):
http://www.xen.org/files/xensummit_4/VT_roadmap_d_Nakajima.pdf


MADsathomse: sorry, typo..... Should have been VT-d

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Of the HP ProLiant range, the only current model which IMHO supports VT-d with Intel's 5400 chipset is the ProLiant DL-160 G5. See this link: http://h10010.www1.hp.com/wwpc/de/de/sm/WF06a/135-141-374573-374573-1208...

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So this is my understanding from days of reading through intel and OEM's websites and almost losing vision from reading too much marketing literature.

Chipset 5400 is targetted at workstations and supports vt-d(1?).

Chipset 3200 and 3210 that are targetted for servers (supposedly) support Intel-VT. Now it doesn't say if VT in this case means vt-d or vt-x (which is without the dma re-mapping). Could someone confirm this? I know this has been mentioned in the list before, but Intel's website indicates that 3210 and 3200 support Intel VT. If the answer is no, then am I correct in assuming that there are currently _no_ server machines from OEMs that have production vt-d platforms?

Thanks,
--sanjana


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IMHO the 5400 chipset is targeted for the (physical)server and workstation market with Xeon processors e.g.
http://www.intel.com/design/servers/boards/S5400SF/index.htm (supports VT-d)
Watch out: this board (http://www.intel.com/design/servers/platforms/SC5400RA/index.htm) does NOT have the 5400 chipset but the 5000p chipset. The 5000p chipset does NOT support VT-d. The 5000p is the predecessor of the 5400 chipset.

However the Intel 5400 chipset is also used on just one board in the Intel desktop extreme series boards (gamers) e.g. http://www.intel.com/products/motherboard/D5400XS/index.htm. This is a destop board with server components aka Skulltrail.

There is no Intel workstation board (yet) which has the Intel 5400 chipset onboard. However, some other board manufacturers for OEM other than Intel, may already offer for sale workstations or workstation boards with the Intel 5400 chipset. Not sure about that.

I think the combination of Intel chipset with Xeon processor makes it a server- and/or workstation-system. Combinations of Intel chipset with Core Processors (dual core, quad core) are desktop systems. The exception of the rule is the aformentioned D5400XS board (Skulltrail).

Coming back on VT-x. All chipsets and processors launched on the market during the past two years or so support Intel VT-x. However only the latest Intel chipsets and Intel processors add VT-d support (so, virtually all new chipsets and new processors since about march 2008 onwards). Following chipsets support VT-d: Q35, X38, 3200/3220 (1-Socket server) and 5400 (2-Socket server).

Watch out: I stated VT-d support. You have to check with your supplier of your system with OEM board with Intel chipset and Intel processor if VT-d also can be or is enabled in the BIOS! Very tricky indeed.

Bild des Benutzers Craig Watkins (Intel)

A bit on naming conventions used by Intel.


VT by itself generally refers to a processor technology, more specifically, VT-x for x86 and VT-i for Itanium.


VT-d (Virtualization Technology for Directed I/O) is a chipset technology.

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I agree, however if VT-x is not supported by the chipset, it won't work. I know there are/were Intel processors out there with VT-x support, but the chipsets didn't support it.

Equally, if the chipset supports VT-d, the processor also should support it.

It's my understanding that with VT-c, the processor does not require to support it. It should be supported by the chipset and the PCI-e and/or Intel NIC.

It's very intransparent all these technologies. No clear documentation out there. Even within Intel,Citrix and HP it's not all clear. Not to talk about the vendors. They're completely in the dark and bitterly complaining.

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Hi,

This is a nice list, but I was wondering about Dell rack servers that support VT-d. Do you know which ones do?

I am looking to run Xen on them.

Thanks,
Todd

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You've got to ask Dell. But get confirmation in writing.

Example: even HP vendors don't know which ProLiant servers have the 5400 chipset. Currently only the documentation of, I think, the DL-160 shows it has the 5400 chipset. All other ProLiant servers still state they have the 5000p chipset, although one of the major distributors here say that ALL ProLiant servers have the 5400 chipset.

No one really knows. Go figure.

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Expect HP to come up with a NEW Generation 6 line of HP ProLiant servers, with support of Intel's VT-d technology in its chipsets (chipset 5400 as successor of 5000P?) and twice as much RAM as the previous Generation 5.

Expected to be launched between September 2008 and January 2009.

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Quoting - switch6343 You've got to ask Dell. But get confirmation in writing.

Example: even HP vendors don't know which ProLiant servers have the 5400 chipset. Currently only the documentation of, I think, the DL-160 shows it has the 5400 chipset. All other ProLiant servers still state they have the 5000p chipset, although one of the major distributors here say that ALL ProLiant servers have the 5400 chipset.

No one really knows. Go figure.

I have ProLiant DL160 G5 box lying on top of my desk.

I definitely have to say, YES, it has 5400 chipset.

BUT It have no BIOS option to enable/disable VT-d feature, only it allows enabling virtualization with VT-x.

So, XEN does not see any DMAR devices on it.

So with Linux x86_64 bit kernel (where DMA Remapping is compiled in) - it does not see any DMA Remapping devices.

And yes, I have upgraded my BIOS from latest images from HP.

I suppose, there will be NO DMARemapping in DL160 G5, see HP site, just search for virtualization,

you will get the fuss about Xen/vmware/etc working with iLO and about "Logical Servers" to be created through iLO interface.

They will never enable you to use Xen with DMAR without all that "features" they are going to sell you.

The only hope is OpenSource BIOS for that server...

However, that's just IMHO.

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Quoting - spambox Quoting - switch6343 You've got to ask Dell. But get confirmation in writing.

...

I have ProLiant DL160 G5 box lying on top of my desk.

I definitely have to say, YES, it has 5400 chipset.

BUT It have no BIOS option to enable/disable VT-d feature, only it allows enabling virtualization with VT-x.

So, XEN does not see any DMAR devices on it.

So with Linux x86_64 bit kernel (where DMA Remapping is compiled in) - it does not see any DMA Remapping devices.

And yes, I have upgraded my BIOS from latest images from HP.

By the way, I have just asked HP support about the question and they responded:

"The technology is not declared for this model", which mean "No, there will not be VT-d in DL160 G5. Ever".

I asked about future models, they responded:

"For server platforms there will be no such technology until 2009"

which also mean, that there is no HP servers with VT-d 'declared' now, only desktop machines.

So, big fat WARNING: watch out for OEM supporting the feature officially.

Chipset used for platform does not imply it has all implemented features enabled.

CONTACT OEM first. Do it.

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Another post to clarify VT-d support:

1) Is VT-d implemented on the X58, especially the Intel DX58SO?

2) Which chipsets (or Intel boards for that matter) support VT-d on the PCI-e 16x slot? Somewhere in the Q45 announcement I read that this is the first chipset to support VT-d on its PCI-e 16x slot, so I'm wondering about the 5400, Q35, X48 and (as mentioned above) the X58 in this context...

Thanks!

Bild des Benutzers David Ott (Intel)
1: Yes, VT-d is implemented on DX58SO. 2: Yes, I believe it is supported on Q35 (may be SKU dependent) and X48 and X38. Other comments from our engineering staff: "Board slots are not selective on VT-d support. If the chipset supports VT-d, it supports it for the complete BDF space. VMMs don't support all types of devices." "BIOS support is required and I am told some commercial distributions have it fused off."
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Quoting - David Ott (Intel) 1: Yes, VT-d is implemented on DX58SO. 2: Yes, I believe it is supported on Q35 (may be SKU dependent) and X48 and X38. Other comments from our engineering staff: "Board slots are not selective on VT-d support. If the chipset supports VT-d, it supports it for the complete BDF space. VMMs don't support all types of devices." "BIOS support is required and I am told some commercial distributions have it fused off."

Thanks for that answer, especially getting back to engineering :-)

I may have been a bit unclear in my question, thats probably where the confusion about selective slot support came from:

I should have better asked for PEG (PCI express graphics) support instead of PCIE x16. Afaik, DMA remapping is required to get gfx cards virtualized through vt-d and a DMAr engine for the x16 slot was only introduced in the Q45 platform.

Is that correct or not? If yes, then coming back to my initial question on which other platform (that support vtd) do we have support for a DMAr enginer for a x16 port (to drive a PEG)?

Thanks again!

Razor

Bild des Benutzers David Ott (Intel)

VT-d DMA remapping should work with PEG slots.

An engineer told me that they tested slots of various widths using a NIC card and verified that all work. (A methodology you might also try.) Note, however, that graphics card driver writers can sometimes break things by using DMA in non-standard ways in the name of optimization.

Two notes on Xen, if that's what you are using:

An engineer told me that assigning graphics devices to dom0 should work,but that assigning graphics to a guest does not work at this point.

Mailing the Xen mailing list about your question might be helpful. There are people who have tried what you are referring to.

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Actually I'm not reasearching for my self but trying to keep the XenWiki up-to-date because there are so many (mainly unanswered) questions in the Xen mailinglist...

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I'm a bit confused with this posting as I've just bought a SuperMicro Server PC with an "Intel Virtualization Technology" setting in the BIOS which technical support claims should work. However the motherboard is based around the Intel 5000p.

There's very little information around about how Intel VT is related to VT-D. Should these be represented by two entries in the BIOS or do they both fall under "Intel Virtualization Technology". Is it possible to have a MB which supports VT but not VT-D and if so can you run Microsoft Hyper-V on it?

Thanks,

Oli.

Quoting - switch6343 ...

This link compares the 5000p server chipset (no VT support!) and the 5400 server chipset (with VT support):
http://compare.intel.com/pcc/showchart.aspx?mmID=24664,28047&familyID=9&...

...

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hail,

I've been told, an this thread confirms, that my great P35 Gigabyte Motherboard can't do VT-d. When I heard about this, the first thing on mind was, what was told before here, have a unix Desktop and a Windows box to game.
why Intel don't make VT-d to P35 ? as Q35 is a cousin to it ?

Why I have to have Integrated Graphics to have VT-d ?

and most, Why this was not in 72 size fonts in P35 and Q35 reference pages before I bought it ? :/

so now I must buy another MOBO and it must be Q45 based ?

thanks,

matheus

Bild des Benutzers David Ott (Intel)
VT is Intel Virtualization Technology, an umbrella term that includes many different features. VT-d stands for Intel Virtualization for Directed I/O, a specific feature under VT. Included in VT-don Intel Corei7are the capabilities: (a) I/O device assignment, (b) DMA remapping, (c) interrupt remapping, and (d) reliability features.

You can read about VT-d in detail at:

http://www.intel.com/technology/virtualization/technology.htm?iid=tech_v...

Click on the link entitled "Intel Virtualization Technology (Intel VT) for Directed I/O (Intel VT-d) Architecture Specification".

Yes, it is entirely possible to run a hypervisor without VT-d support. You merely miss the performance advantages associated with the feature.

David Ott

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Does Intel 3210 Chipset support vt-d? We have a virtualization system
(KVM) with this chipset, cpu-core 2 duo E8400, BIOS - AMI with vt-d enabled. The guest OS is w2003 server, host is Linux based on
2.6.32 kernel. Two eth nic ports are configured as PCI-passthrough devices for the guest OS. Software RAID virtual devices (VD) (from host) is presented to the guest as virtio. When I do IO test on the VD from the guest OS, after a while, I will see warning messages:

Sep 9 20:32:23 (none) kernel: [83889.934743] DRHD: handling fault status reg 2
Sep 9 20:32:23 (none) kernel: [83889.934747] DMAR:[DMA Write] Request device
[01:00.0] fault addr 0
Sep 9 20:32:23 (none) kernel: [83889.934748] DMAR:[fault reason 05] PTE Write
access is not set

What could be the cause for this?

Bild des Benutzers prashanth-babu (Intel)
Quoting z160896 Does Intel 3210 Chipset support vt-d? We have a virtualization system
(KVM) with this chipset, cpu-core 2 duo E8400, BIOS - AMI with vt-d enabled. The guest OS is w2003 server, host is Linux levitra based on
2.6.32 kernel. Two eth nic ports are configured as PCI-passthrough devices for the guest OS. Software RAID virtual devices (VD) (from host) is presented to the guest as virtio. When I do IO test on the VD from the guest OS, after a while, I will see warning messages:

Sep 9 20:32:23 (none) kernel: [83889.934743] DRHD: handling fault status reg 2
Sep 9 20:32:23 (none) kernel: [83889.934747] DMAR:[DMA Write] Request device
[01:00.0] fault addr 0
Sep 9 20:32:23 (none) kernel: [83889.934748] DMAR:[fault reason 05] PTE Write
access is not set

What could be the cause for this?

A bit on naming conventions used by Intel.

VT by itself generally refers to a processor technology, more specifically, VT-x for x86 and VT-i for Itanium.

VT-d (Virtualization Technology for Directed I/O) is a chipset technology.

Bild des Benutzers nweissma
Quoting David Ott (Intel) "BIOS support is required and I am told some commercial distributions have it fused off."

for what reasons would an OEM permanently disable virtualization; what benefits are to be gained; if an end-user bought the computer for the express purpose of virtualization then why would the oem deliberately -- and permanently -- frustrate -- effectively defraud -- the enduser?

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Hi,

I m in search for the motherboard which supports Q45 Chipset also supports 16Gig DDR2 memory.. I found out this on the web .. I am getting back into Intel technologies .. I don't have any clue how good this motherboard is .. The company called IBase MB945 with Q45 Intel chipset .. I am tryiing to find the Motherbpard manual to confirm myself it does support Vt-d technologies ..

If anybody bought this borad and using .. please through some light on this ..

Thanks in advance.. !!

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