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

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

Please take a look. The first patch just cleans up the find_unbound_irq
so it is easier to understand what it does.

The second patch hardness the Xen IRQ (event channels) allocation finder
if you try to boot a minimalistic 32-bit Linux kernel along with a
Xen hypervisor under QEMU.

We end up with a weird scenario where the nr_irq_gsi was greater than nr_irq
by 16. This code hardness it by pointing out the issue to the user and tries
to continue - BUT this might impact the PCI device allocation.

Tested also on normal machine with no regressions found.

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