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xen: use our own eventchannel->irq path

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Rather than overloading vectors for event channels, take full
responsibility for mapping an event channel to irq directly.  With
this patch Xen has its own irq allocator.

When the kernel gets an event channel upcall, it maps the event
channel number to an irq and injects it into the normal interrupt
path.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge
2009-02-06 14:09:43 -08:00
committed by Ingo Molnar
parent eca217b36e
commit 792dc4f6cd
3 changed files with 21 additions and 24 deletions
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17
arch/x86/xen/irq.c
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@ -19,21 +19,6 @@ void xen_force_evtchn_callback(void)
(void)HYPERVISOR_xen_version(0, NULL);
}
static void __init __xen_init_IRQ(void)
{
int i;
/* Create identity vector->irq map */
for(i = 0; i < NR_VECTORS; i++) {
int cpu;
for_each_possible_cpu(cpu)
per_cpu(vector_irq, cpu)[i] = i;
}
xen_init_IRQ();
}
static unsigned long xen_save_fl(void)
{
struct vcpu_info *vcpu;
@ -127,7 +112,7 @@ static void xen_halt(void)
}
static const struct pv_irq_ops xen_irq_ops __initdata = {
.init_IRQ = __xen_init_IRQ,
.init_IRQ = xen_init_IRQ,
.save_fl = PV_CALLEE_SAVE(xen_save_fl),
.restore_fl = PV_CALLEE_SAVE(xen_restore_fl),