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Re: [Xen-users] VT-D RMRR is incorrect


As someone shopping for a new PC and hoping to use VT-d, 
I've found that the ASUS P6T Deluxe and Rampage II Extreme fit my needs.

However, I'm (to say the least!) disappointed by yet another hw manufacturer
features then not supporting them when they don't even work... They should
be sued
for that (and how infuriating to get an answer like "we don't support
Linux", wtf, what does 
the main OS has *anything* to do with a broken DMAR table in the Bios: it is
going to screw
whatever hypervisor you use that expects IOMMU functionality)

Anyway, enough of the rant.  

I was wondering if there was an unofficial patched BIOS in circulation that
I could use
the P6T ?

The Xen VT-d howto seems to hint at that:


"ASUS P6T Deluxe (Intel X58 chipset) requires (currently non-public) BIOS
update to correct DMAR-table issue "

Any hint where I might find this BIOS update ?

Thank you!

Steve McIntosh-3 wrote:
> I've had the same problem trying to run VT-d on an Asus P5Q-EM DO
> (Intel Q45 chipset).  Perhaps it's just best to avoid Asus hardware
> when it comes to IOMMU virtualization because it appears their boards
> may fail to adhere to proper Intel VT-d spec.  Fortunately I had
> another motherboard lying around that I swapped it for.
> I'm now successfully passing through PCI NICs and USB controllers in
> Xen 3.4 on an Intel DQ35JO motherboard with the 1016 bios revision.
> (The controller [00:1a.7] takes the 'guestdev=xx:yy.z
> reassign_resources' kernel module flag instead of the pciback.hide
> because of a memory issue.)  As a result I'm able to use a Creative
> USB (Win)Modem Blaster v.92 passed through to a Windows XP HVM.
> So, for now, it looks like the only VT-d options are Intel branded
> boards.  Personally, I can't wait for the new AMD chipset to come out
> with their own IOMMU, that should open up the playing field to more
> competition.
> On Sun, Jul 26, 2009 at 10:53 AM, srynoname<regtrash@xxxxxxxx> wrote:
>> tmoore wrote:
>>> I`ve raised a support case with ASUS to try to get them to fix the BIOS
>>> on
>>> P6T Deluxe ... I`ll keep this thread updated.
>>> The IOMMU is seriously broken on this board, I have tried many
>>> workarounds
>>> and it always results in failure.
>> Hello,
>> did you get a reply? Somebody else has something new about the Asus P6T
>> and
>> this problem? How about VT-d on windows systems? Thanks!
>> --
>> View this message in context:
>> http://www.nabble.com/VT-D-RMRR-is-incorrect-tp22005500p24661872.html
>> Sent from the Xen - User mailing list archive at Nabble.com.
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