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

[Alexander Piavka <piavka@xxxxxxxxxxxx>]

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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