Re: [Qemu-devel] q35 chipset support

[Anthony Liguori]

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

>