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Commit c7c2c3a2 authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk
Browse files

xen/irq: Add support to check if IRQ line is shared with other domains. 



We do this via the PHYSDEVOP_irq_status_query support hypervisor call.
We will get a positive value if another domain has binded its
PIRQ to the specified GSI (IRQ line).

[v2: Deal with v2.6.37-rc1 rebase fallout]
[v3: Deal with stable/irq.cleanup fallout]
[v4: xen_ignore_irq->xen_test_irq_shared]
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent beafbdc1

drivers/xen/events.c

+12 −0
Original line number Diff line number Diff line
@@ -1508,6 +1508,18 @@ void xen_poll_irq(int irq) 
	xen_poll_irq_timeout(irq, 0 /* no timeout */);

}



/* Check whether the IRQ line is shared with other guests. */

int xen_test_irq_shared(int irq)

{

	struct irq_info *info = info_for_irq(irq);

	struct physdev_irq_status_query irq_status = { .irq = info->u.pirq.pirq };



	if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))

		return 0;

	return !(irq_status.flags & XENIRQSTAT_shared);

}

EXPORT_SYMBOL_GPL(xen_test_irq_shared);



void xen_irq_resume(void)

{

	unsigned int cpu, evtchn;

include/xen/events.h

+3 −0
Original line number Diff line number Diff line
@@ -95,4 +95,7 @@ int xen_destroy_irq(int irq); 
/* Return irq from pirq */

int xen_irq_from_pirq(unsigned pirq);



/* Determine whether to ignore this IRQ if it is passed to a guest. */

int xen_test_irq_shared(int irq);



#endif	/* _XEN_EVENTS_H */