[Xen-devel] Re: [PATCH] Fix when booting Xen+Linux under QEMU.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

> I think I'd prefer to:
> 
>    1. move to using all dynamic irqs, and use the core kernel irq
>       allocator (ie, resurrect IanC's patches)

That would make it easier, except that they don't work when you have DomU 
guest with Xen PCI front. Simply b/c the DomU guest has no idea of what GSI of
the host machine is. Hence the find_unbound_irq that starts from the top 
(nr_irqs) and goes down to GSI count (nr_irq_gsi).

Maybe we can stick it in the Xen PCIfronted/Xen PCI backend a mechanism (some 
key value) which will specify the host's nr_irq_gsi value. Then the DomU guest 
can set that and then use the core kernel irq allocator...

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