xen/irq: Add support to check if IRQ line is shared with other domains. (c7c2c3a2) · Commits · 戴 / test

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:

Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

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 */

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