[Qemu-devel] Re: [SeaBIOS] seabios: acpi: add _RMV control method for PCI devices

[Marcelo Tosatti]

On Mon, Dec 20, 2010 at 07:44:12PM +0200, Avi Kivity wrote:
> On 12/20/2010 07:05 PM, Marcelo Tosatti wrote:
> >>  >
> >>  >Yes, perhaps it all (including PCI hotplug controller) should be using
> >>  >something else than hardcoded IO ports, but thats what we have now.
> >>
> >>  At least it should be documented.
> >>
> >>  What's the behaviour with a qemu that doesn't support the new port?
> >>  We don't strictly support it, but let's do so if we can.
> >
> >All slots will be marked as hotpluggable (since the "removability" IO port 
> >will not be
> >registered and return all 1's).
> >
> 
> Good, so compatibility is retained.  seabios will know not to
> allocate this address to pci bars?

seabios starts allocating at 0xc000, which is past the hardcoded
addresses.

In any case, qemu will abort on registration if there are conflicts.