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Date: Thu, 10 Feb 2011 13:51:14 +0100
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] KVM call minutes for Feb 8
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To: Gleb Natapov <gleb@redhat.com>
Cc: Chris Wright <chrisw@redhat.com>, kvm@vger.kernel.org, Markus Armbruster <armbru@redhat.com>, qemu-devel@nongnu.org, Blue Swirl <blauwirbel@gmail.com>, Avi Kivity <avi@redhat.com>

On 02/10/2011 12:13 PM, Gleb Natapov wrote:
>
> Which spec? Even in this discussion we completely mixed different
> things. 440FX is not a chipset.

Yes, it is.  It's a single silicon package with a defined pinout.  If 
you don't believe me, re-read the spec.

It's a MCM with the PIIX3 being internally connected.   The connection 
between the i440fx and PIIX3 happens to be PCI but that's not always the 
case.  Sometimes it's a proprietary bus.

> Again you probably mean PIIX3. Even then removing unused ide will free
> one more PCI slot for my cool virtio disk array. The things is, from
> code point of view, it does not cost you extra to allow composition of
> ide since it is just a regular PCI device and we need to support composing
> those anyway.
>    

If this is useful, and it doesn't break guests, you can always do 
-device i440fx,ide=off.  However, it's an exception where we're 
deviating from how hardware works.

And that's okay, but the base modelling ought to follow real hardware 
closely with deviations being the exception.

Regards,

Anthony Liguori