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Re: [Xen-users] Intel VT-d Support

On Wed, 5 Mar 2008, Igor Chubin wrote:

...
Vanilla kernel works fine
and Debian GNU/Linux (2.6.18) works fine.

Just one thing:
to boot kernel correctly I must
specify

pci=nommconf

 At least it's better than all-generic-ide pci=nommconf irqpoll
 which i had to specifiy with ICH9 chipset to boot non xen 2.6.18
kernels, and still it it did not work with xen vanilla kernel 2.6.18, the
only
xen enabled kernel which reasonably worked with ICH9 chipset was from ubuntu.


What happens when you specify only pci=nommconf ?

 Frankly i don't remember exactly but AFAIR, without pci=nommconf
the boot process would simply hang, and with pci=nommconf it would fail to pin some irqs

 Alex



 Another question, as i understand with VT-d and pci passthrough enabled
in the xen-3.2 kernel it should be possible to give HVM domU direct &
priviliged access to the whole pci disk controller. But is it possible to
give HVM domU direct & priviliged access only to specific hard disk
attached to this disk controller?

No, it is impossible, AFAIK.
You can passthrough only entire PCI-device,
so you can not give access to just one disk.


To say short, you can passthrough units,
which you can see using lspci command.


--
WBR, i.m.chubin


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