[CentOS-virt] Xen pci passthru problems with kernel -164.6.1

Pasi Kärkkäinen pasik at iki.fi
Tue Nov 10 17:34:57 UTC 2009

On Tue, Nov 10, 2009 at 01:57:42PM -0200, Miguel Di Ciurcio Filho wrote:
> I previously reported this on the centos mailing list:
> http://lists.centos.org/pipermail/centos/2009-November/085672.html
> And I've found out that Red Hat has backported the VT-d support from Xen 
> 3.3 to RHEL 5.4.
> http://lists.centos.org/pipermail/centos/2009-November/085677.html
> It seams to me that the "classic" Xen pci-passthru (up to Xen 3.2) works
> only on some minor cases as described here (when using the new kernel 
> and hypervisor):
> https://bugzilla.redhat.com/show_bug.cgi?id=514458#c4
> The recommendation seams to be (although not stated at any 
> documentation) to use the VT-d support for various reasons (better 
> security for the guests when accessing the hardware I guess).
> My concern is that the hardware I use does not support VT-d (it is a 
> Intel 5000P chipset, ~2 years old) so I believe I'm kind of screwed. Or 
> keep using the kernel and Xen packages from 5.3 (not a good option either).

Yeah.. VT-d support is only on most recent chipsets, and many BIOSes
still have broken implementations of it :(

> Am I the only one bitten by this?

Yeah I guess.. so far..

-- Pasi

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