Re: [Qemu-devel] q35 chipset support

[Michael S. Tsirkin]

On Mon, Jun 18, 2012 at 09:16:24AM -0500, Anthony Liguori wrote:
> On 06/17/2012 03:25 AM, Michael S. Tsirkin wrote:
> >On Fri, Jun 15, 2012 at 12:58:33PM -0500, Anthony Liguori wrote:
> >>The Q35 is much more sophisticated.  The PCI-e complex itself can
> >>present interesting topologies and the legacy PCI bus sits within
> >>the PCI-e complex.
> >
> >Ah, so we can mix in PCI as well? Cool. How does
> >such a mixed topology look?
> 
> It does, but I'm having a really hard time deciphering the spec
> here.  Here's what it says:
> 
> "The ICH9 PCI interface provides a 33 MHz, Revision 2.3 implementation. The 
> ICH9
> integrates a PCI arbiter that supports up to four external PCI bus
> masters in addition to the internal ICH9 requests. This allows for
> combinations of up to four PCI down devices and PCI slots."
> 
> So my interpretation of this is that it provides the ability to
> expose legacy PCI slots.  I can't get a reading though on how this
> shows up in the PCI topology though.
> 
> It sounds like it would show up as a separate PCI domain.
> 
> Regards,
> 
> Anthony Liguori

Actually I found a box with ICH9
http://fpaste.org/VREA/
or see attached.

It looks like there's at least one PCI bridge attached to
the host bridge.

> >

tuck-lspci.txt
Description: Text document