Re: [Xen-users] Re: IOMMU capable hardware

To:	David Stone <unclestoner@xxxxxxxxx>
Subject:	Re: [Xen-users] Re: IOMMU capable hardware
From:	Nico Kadel-Garcia <nkadel@xxxxxxxxx>
Date:	Sun, 16 Dec 2007 17:23:17 +0000
Cc:	Mark Williamson <mark.williamson@xxxxxxxxxxxx>, Igor Chubin <igor@xxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx, Joop Boonen <joop_boonen@xxxxxx>
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David Stone wrote:

Hi, I have been doing some significant experimentation with Intel's
IOMMU (VT-d) so I can answer your questions.

 * Yes, real IOMMUs (at least Intel's VT-d) are available on the
market today, both as loose motherboards and in OEM systems.  For
details see /docs/misc/vtd.txt in the Xen source.  To repeat what is
in that file:
  1) For VT-d enabling work on Xen, we have been using development
  systems using following Intel motherboards:
      - DQ35MP
      - DQ35JO
  2) As far as we know, following OEM systems also has vt-d enabled.
  Feel free to add others as they become available.
     c=us&cs=555&l=en&s=biz
    - HP Compaq:  DC7800

HP DL380-G5's are available, as are Dell 2950's. I've used bothsuccessfully, just make sure to get the right CPU's. I've worked direclyonly with Intel, not AMD with this kind of virtualization.

Note that nieither of them enable this by *default*, you have toconfigure it in the BIOS. This means that BIOS upgrades or 3 failedreboots in a row will revert the system to VT disabled, and you'll needconsole access to re-enable it, until and unless you have something likea LinuxBIOS installed.


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Re: [Xen-users] Re: IOMMU capable hardware