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xen: SMP guest support

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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>
This commit is contained in:
Jeremy Fitzhardinge
2007-07-17 18:37:06 -07:00
committed by Jeremy Fitzhardinge
parent ab55028886
commit f87e4cac4f
11 changed files with 705 additions and 53 deletions
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27
include/xen/events.h
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@@ -1,15 +1,32 @@
#ifndef _XEN_EVENTS_H
#define _XEN_EVENTS_H
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <xen/interface/event_channel.h>
#include <asm/xen/hypercall.h>
enum ipi_vector {
XEN_RESCHEDULE_VECTOR,
XEN_CALL_FUNCTION_VECTOR,
XEN_NR_IPIS,
};
int bind_evtchn_to_irqhandler(unsigned int evtchn,
irqreturn_t (*handler)(int, void *),
irq_handler_t handler,
unsigned long irqflags, const char *devname,
void *dev_id);
int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
irqreturn_t (*handler)(int, void *),
unsigned long irqflags, const char *devname, void *dev_id);
irq_handler_t handler,
unsigned long irqflags, const char *devname,
void *dev_id);
int bind_ipi_to_irqhandler(enum ipi_vector ipi,
unsigned int cpu,
irq_handler_t handler,
unsigned long irqflags,
const char *devname,
void *dev_id);
/*
* Common unbind function for all event sources. Takes IRQ to unbind from.
@@ -18,6 +35,8 @@ int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
*/
void unbind_from_irqhandler(unsigned int irq, void *dev_id);
void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
static inline void notify_remote_via_evtchn(int port)
{
struct evtchn_send send = { .port = port };