xen: implement pirq type event channels
A privileged PV Xen domain can get direct access to hardware. In order for this to be useful, it must be able to get hardware interrupts. Being a PV Xen domain, all interrupts are delivered as event channels. PIRQ event channels are bound to a pirq number and an interrupt vector. When a IO APIC raises a hardware interrupt on that vector, it is delivered as an event channel, which we can deliver to the appropriate device driver(s). This patch simply implements the infrastructure for dealing with pirq event channels. [ Impact: integrate hardware interrupts into Xen's event scheme ] Signed-off-by:Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by:
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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d8e04206