f87e4cac4f
This is a fairly straightforward Xen implementation of smp_ops. Xen has its own IPI mechanisms, and has no dependency on any APIC-based IPI. The smp_ops hooks and the flush_tlb_others pv_op allow a Xen guest to avoid all APIC code in arch/i386 (the only apic operation is a single apic_read for the apic version number). One subtle point which needs to be addressed is unpinning pagetables when another cpu may have a lazy tlb reference to the pagetable. Xen will not allow an in-use pagetable to be unpinned, so we must find any other cpus with a reference to the pagetable and get them to shoot down their references. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Cc: Benjamin LaHaise <bcrl@kvack.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Andi Kleen <ak@suse.de>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
#ifndef _XEN_EVENTS_H
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#define _XEN_EVENTS_H
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#include <linux/interrupt.h>
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#include <xen/interface/event_channel.h>
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#include <asm/xen/hypercall.h>
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enum ipi_vector {
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XEN_RESCHEDULE_VECTOR,
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XEN_CALL_FUNCTION_VECTOR,
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XEN_NR_IPIS,
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};
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int bind_evtchn_to_irqhandler(unsigned int evtchn,
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irq_handler_t handler,
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unsigned long irqflags, const char *devname,
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void *dev_id);
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int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
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irq_handler_t handler,
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unsigned long irqflags, const char *devname,
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void *dev_id);
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int bind_ipi_to_irqhandler(enum ipi_vector ipi,
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unsigned int cpu,
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irq_handler_t handler,
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unsigned long irqflags,
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const char *devname,
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void *dev_id);
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/*
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* Common unbind function for all event sources. Takes IRQ to unbind from.
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* Automatically closes the underlying event channel (even for bindings
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* made with bind_evtchn_to_irqhandler()).
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*/
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void unbind_from_irqhandler(unsigned int irq, void *dev_id);
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void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
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static inline void notify_remote_via_evtchn(int port)
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{
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struct evtchn_send send = { .port = port };
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(void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
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}
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extern void notify_remote_via_irq(int irq);
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#endif /* _XEN_EVENTS_H */
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