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Re: [Xen-devel] [RFC 0 PATCH 3/3] PVH dom0: construct_dom0 changes

On Fri, Oct 04, 2013 at 05:07:59PM +0100, Jan Beulich wrote:
> >>> On 04.10.13 at 18:02, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 
> >>> wrote:
> > So back to hooking up a new hypercall in the PCI subsystem when
> > resource assigment has been completed? And also if the PCI subsystem
> > decides to re-write the resource addresses to odd locations.
> > 
> > Can't one also trap for the configuration changes on the PCI
> > devices and extract the physical locations then?
> Yes, of course we could be snooping the CFG writes, but that's
> as simple as it sounds only for the port CF8 based accesses. For
> MCFG based accesses it would mean we'd have to write protect
> the whole MCFG range, and use emulation there. Not very
> pretty, but doable.

Hypervisor call is then a more appropiate if it can be done (Mukesh
says that v0 of the patch had something like that in so he will try
to recreate it) and then as a fallback we could do the emulation.

> Jan

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