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Re: [Qemu-devel] q35 chipset support

From: Anthony Liguori
Subject: Re: [Qemu-devel] q35 chipset support
Date: Mon, 18 Jun 2012 10:15:01 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120329 Thunderbird/11.0.1

On 06/18/2012 09:35 AM, Michael S. Tsirkin wrote:
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.


Anthony Liguori

Actually I found a box with ICH9
or see attached.

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

Right, and it appears to be a 2.3 bridge (the express capability isn't set).

I guess that's the mobile PCI expansion slots as it has a flash card reader in 


Anthony Liguori

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