Implement vector callback for PVHVM and unify event channel implementations

Re-structure Xen HVM support so that:
	- Xen is detected and hypercalls can be performed very
	  early in system startup.
	- Xen interrupt services are implemented using FreeBSD's native
	  interrupt delivery infrastructure.
	- the Xen interrupt service implementation is shared between PV
	  and HVM guests.
	- Xen interrupt handlers can optionally use a filter handler
	  in order to avoid the overhead of dispatch to an interrupt
	  thread.
	- interrupt load can be distributed among all available CPUs.
	- the overhead of accessing the emulated local and I/O apics
	  on HVM is removed for event channel port events.
	- a similar optimization can eventually, and fairly easily,
	  be used to optimize MSI.

Early Xen detection, HVM refactoring, PVHVM interrupt infrastructure,
and misc Xen cleanups:

Sponsored by: Spectra Logic Corporation

Unification of PV & HVM interrupt infrastructure, bug fixes,
and misc Xen cleanups:

Submitted by: Roger Pau Monné
Sponsored by: Citrix Systems R&D

sys/x86/x86/local_apic.c:
sys/amd64/include/apicvar.h:
sys/i386/include/apicvar.h:
sys/amd64/amd64/apic_vector.S:
sys/i386/i386/apic_vector.s:
sys/amd64/amd64/machdep.c:
sys/i386/i386/machdep.c:
sys/i386/xen/exception.s:
sys/x86/include/segments.h:
	Reserve IDT vector 0x93 for the Xen event channel upcall
	interrupt handler.  On Hypervisors that support the direct
	vector callback feature, we can request that this vector be
	called directly by an injected HVM interrupt event, instead
	of a simulated PCI interrupt on the Xen platform PCI device.
	This avoids all of the overhead of dealing with the emulated
	I/O APIC and local APIC.  It also means that the Hypervisor
	can inject these events on any CPU, allowing upcalls for
	different ports to be handled in parallel.

sys/amd64/amd64/mp_machdep.c:
sys/i386/i386/mp_machdep.c:
	Map Xen per-vcpu area during AP startup.

sys/amd64/include/intr_machdep.h:
sys/i386/include/intr_machdep.h:
	Increase the FreeBSD IRQ vector table to include space
	for event channel interrupt sources.

sys/amd64/include/pcpu.h:
sys/i386/include/pcpu.h:
	Remove Xen HVM per-cpu variable data.  These fields are now
	allocated via the dynamic per-cpu scheme.  See xen_intr.c
	for details.

sys/amd64/include/xen/hypercall.h:
sys/dev/xen/blkback/blkback.c:
sys/i386/include/xen/xenvar.h:
sys/i386/xen/clock.c:
sys/i386/xen/xen_machdep.c:
sys/xen/gnttab.c:
	Prefer FreeBSD primatives to Linux ones in Xen support code.

sys/amd64/include/xen/xen-os.h:
sys/i386/include/xen/xen-os.h:
sys/xen/xen-os.h:
sys/dev/xen/balloon/balloon.c:
sys/dev/xen/blkback/blkback.c:
sys/dev/xen/blkfront/blkfront.c:
sys/dev/xen/console/xencons_ring.c:
sys/dev/xen/control/control.c:
sys/dev/xen/netback/netback.c:
sys/dev/xen/netfront/netfront.c:
sys/dev/xen/xenpci/xenpci.c:
sys/i386/i386/machdep.c:
sys/i386/include/pmap.h:
sys/i386/include/xen/xenfunc.h:
sys/i386/isa/npx.c:
sys/i386/xen/clock.c:
sys/i386/xen/mp_machdep.c:
sys/i386/xen/mptable.c:
sys/i386/xen/xen_clock_util.c:
sys/i386/xen/xen_machdep.c:
sys/i386/xen/xen_rtc.c:
sys/xen/evtchn/evtchn_dev.c:
sys/xen/features.c:
sys/xen/gnttab.c:
sys/xen/gnttab.h:
sys/xen/hvm.h:
sys/xen/xenbus/xenbus.c:
sys/xen/xenbus/xenbus_if.m:
sys/xen/xenbus/xenbusb_front.c:
sys/xen/xenbus/xenbusvar.h:
sys/xen/xenstore/xenstore.c:
sys/xen/xenstore/xenstore_dev.c:
sys/xen/xenstore/xenstorevar.h:
	Pull common Xen OS support functions/settings into xen/xen-os.h.

sys/amd64/include/xen/xen-os.h:
sys/i386/include/xen/xen-os.h:
sys/xen/xen-os.h:
	Remove constants, macros, and functions unused in FreeBSD's Xen
	support.

sys/xen/xen-os.h:
sys/i386/xen/xen_machdep.c:
sys/x86/xen/hvm.c:
	Introduce new functions xen_domain(), xen_pv_domain(), and
	xen_hvm_domain().  These are used in favor of #ifdefs so that
	FreeBSD can dynamically detect and adapt to the presence of
	a hypervisor.  The goal is to have an HVM optimized GENERIC,
	but more is necessary before this is possible.

sys/amd64/amd64/machdep.c:
sys/dev/xen/xenpci/xenpcivar.h:
sys/dev/xen/xenpci/xenpci.c:
sys/x86/xen/hvm.c:
sys/sys/kernel.h:
	Refactor magic ioport, Hypercall table and Hypervisor shared
	information page setup, and move it to a dedicated HVM support
	module.

	HVM mode initialization is now triggered during the
	SI_SUB_HYPERVISOR phase of system startup.  This currently
	occurs just after the kernel VM is fully setup which is
	just enough infrastructure to allow the hypercall table
	and shared info page to be properly mapped.

sys/xen/hvm.h:
sys/x86/xen/hvm.c:
	Add definitions and a method for configuring Hypervisor event
	delievery via a direct vector callback.

sys/amd64/include/xen/xen-os.h:
sys/x86/xen/hvm.c:

sys/conf/files:
sys/conf/files.amd64:
sys/conf/files.i386:
	Adjust kernel build to reflect the refactoring of early
	Xen startup code and Xen interrupt services.

sys/dev/xen/blkback/blkback.c:
sys/dev/xen/blkfront/blkfront.c:
sys/dev/xen/blkfront/block.h:
sys/dev/xen/control/control.c:
sys/dev/xen/evtchn/evtchn_dev.c:
sys/dev/xen/netback/netback.c:
sys/dev/xen/netfront/netfront.c:
sys/xen/xenstore/xenstore.c:
sys/xen/evtchn/evtchn_dev.c:
sys/dev/xen/console/console.c:
sys/dev/xen/console/xencons_ring.c
	Adjust drivers to use new xen_intr_*() API.

sys/dev/xen/blkback/blkback.c:
	Since blkback defers all event handling to a taskqueue,
	convert this task queue to a "fast" taskqueue, and schedule
	it via an interrupt filter.  This avoids an unnecessary
	ithread context switch.

sys/xen/xenstore/xenstore.c:
	The xenstore driver is MPSAFE.  Indicate as much when
	registering its interrupt handler.

sys/xen/xenbus/xenbus.c:
sys/xen/xenbus/xenbusvar.h:
	Remove unused event channel APIs.

sys/xen/evtchn.h:
	Remove all kernel Xen interrupt service API definitions
	from this file.  It is now only used for structure and
	ioctl definitions related to the event channel userland
	device driver.

	Update the definitions in this file to match those from
	NetBSD.  Implementing this interface will be necessary for
	Dom0 support.

sys/xen/evtchn/evtchnvar.h:
	Add a header file for implemenation internal APIs related
	to managing event channels event delivery.  This is used
	to allow, for example, the event channel userland device
	driver to access low-level routines that typical kernel
	consumers of event channel services should never access.

sys/xen/interface/event_channel.h:
sys/xen/xen_intr.h:
	Standardize on the evtchn_port_t type for referring to
	an event channel port id.  In order to prevent low-level
	event channel APIs from leaking to kernel consumers who
	should not have access to this data, the type is defined
	twice: Once in the Xen provided event_channel.h, and again
	in xen/xen_intr.h.  The double declaration is protected by
	__XEN_EVTCHN_PORT_DEFINED__ to ensure it is never declared
	twice within a given compilation unit.

sys/xen/xen_intr.h:
sys/xen/evtchn/evtchn.c:
sys/x86/xen/xen_intr.c:
sys/dev/xen/xenpci/evtchn.c:
sys/dev/xen/xenpci/xenpcivar.h:
	New implementation of Xen interrupt services.  This is
	similar in many respects to the i386 PV implementation with
	the exception that events for bound to event channel ports
	(i.e. not IPI, virtual IRQ, or physical IRQ) are further
	optimized to avoid mask/unmask operations that aren't
	necessary for these edge triggered events.

	Stubs exist for supporting physical IRQ binding, but will
	need additional work before this implementation can be
	fully shared between PV and HVM.

sys/amd64/amd64/mp_machdep.c:
sys/i386/i386/mp_machdep.c:
sys/i386/xen/mp_machdep.c
sys/x86/xen/hvm.c:
	Add support for placing vcpu_info into an arbritary memory
	page instead of using HYPERVISOR_shared_info->vcpu_info.
	This allows the creation of domains with more than 32 vcpus.

sys/i386/i386/machdep.c:
sys/i386/xen/clock.c:
sys/i386/xen/xen_machdep.c:
sys/i386/xen/exception.s:
	Add support for new event channle implementation.

1 files changed, 0 insertions, 467 deletions

diff --git a/sys/dev/xen/xenpci/evtchn.c b/sys/dev/xen/xenpci/evtchn.c
deleted file mode 100644
index 2d9dd6d..0000000
--- a/sys/dev/xen/xenpci/evtchn.c
+++ /dev/null
@@ -1,467 +0,0 @@
-/******************************************************************************
- * evtchn.c
- *
- * A simplified event channel for para-drivers in unmodified linux
- *
- * Copyright (c) 2002-2005, K A Fraser
- * Copyright (c) 2005, Intel Corporation <xiaofeng.ling@intel.com>
- *
- * This file may be distributed separately from the Linux kernel, or
- * incorporated into other software packages, subject to the following license:
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this source file (the "Software"), to deal in the Software without
- * restriction, including without limitation the rights to use, copy, modify,
- * merge, publish, distribute, sublicense, and/or sell copies of the Software,
- * and to permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/bus.h>
-#include <sys/malloc.h>
-#include <sys/kernel.h>
-#include <sys/limits.h>
-#include <sys/lock.h>
-#include <sys/mutex.h>
-#include <sys/interrupt.h>
-#include <sys/pcpu.h>
-
-#include <machine/xen/xen-os.h>
-#include <machine/xen/xenvar.h>
-#include <xen/hypervisor.h>
-#include <xen/xen_intr.h>
-#include <xen/evtchn.h>
-#include <sys/smp.h>
-
-#include <dev/xen/xenpci/xenpcivar.h>
-
-#if defined(__i386__)
-#define	__ffs(word)	(ffs(word) - 1)
-#elif defined(__amd64__)
-static inline unsigned long __ffs(unsigned long word)
-{
-        __asm__("bsfq %1,%0"
-                :"=r" (word)
-                :"rm" (word));	/* XXXRW: why no "cc"? */
-        return word;
-}
-#else
-#error "evtchn: unsupported architecture"
-#endif
-
-#define is_valid_evtchn(x)	((x) != 0)
-#define evtchn_from_irq(x)	(irq_evtchn[irq].evtchn)
-
-static struct {
-	struct mtx lock;
-	driver_intr_t *handler;
-	void *arg;
-	int evtchn;
-	int close:1; /* close on unbind_from_irqhandler()? */
-	int inuse:1;
-	int in_handler:1;
-	int mpsafe:1;
-} irq_evtchn[256];
-static int evtchn_to_irq[NR_EVENT_CHANNELS] = {
-	[0 ...  NR_EVENT_CHANNELS-1] = -1 };
-
-static struct mtx irq_alloc_lock;
-static device_t xenpci_device;
-
-#define ARRAY_SIZE(a)	(sizeof(a) / sizeof(a[0]))
-
-static unsigned int
-alloc_xen_irq(void)
-{
-	static int warned;
-	unsigned int irq;
-
-	mtx_lock(&irq_alloc_lock);
-
-	for (irq = 1; irq < ARRAY_SIZE(irq_evtchn); irq++) {
-		if (irq_evtchn[irq].inuse) 
-			continue;
-		irq_evtchn[irq].inuse = 1;
-		mtx_unlock(&irq_alloc_lock);
-		return irq;
-	}
-
-	if (!warned) {
-		warned = 1;
-		printf("alloc_xen_irq: No available IRQ to bind to: "
-		       "increase irq_evtchn[] size in evtchn.c.\n");
-	}
-
-	mtx_unlock(&irq_alloc_lock);
-
-	return -ENOSPC;
-}
-
-static void
-free_xen_irq(int irq)
-{
-
-	mtx_lock(&irq_alloc_lock);
-	irq_evtchn[irq].inuse = 0;
-	mtx_unlock(&irq_alloc_lock);
-}
-
-int
-irq_to_evtchn_port(int irq)
-{
-
-	return irq_evtchn[irq].evtchn;
-}
-
-void
-mask_evtchn(int port)
-{
-	shared_info_t *s = HYPERVISOR_shared_info;
-
-	synch_set_bit(port, &s->evtchn_mask[0]);
-}
-
-void
-unmask_evtchn(int port)
-{
-	evtchn_unmask_t op = { .port = port };
-
-	HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &op);
-}
-
-int
-bind_listening_port_to_irqhandler(unsigned int remote_domain,
-    const char *devname, driver_intr_t handler, void *arg,
-    unsigned long irqflags, unsigned int *irqp)
-{
-	struct evtchn_alloc_unbound alloc_unbound;
-	unsigned int irq;
-	int error;
-
-	irq = alloc_xen_irq();
-	if (irq < 0)
-		return irq;
-
-	mtx_lock(&irq_evtchn[irq].lock);
-
-	alloc_unbound.dom        = DOMID_SELF;
-	alloc_unbound.remote_dom = remote_domain;
-	error = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
-					  &alloc_unbound);
-	if (error) {
-		mtx_unlock(&irq_evtchn[irq].lock);
-		free_xen_irq(irq);
-		return (-error);
-	}
-
-	irq_evtchn[irq].handler = handler;
-	irq_evtchn[irq].arg     = arg;
-	irq_evtchn[irq].evtchn  = alloc_unbound.port;
-	irq_evtchn[irq].close   = 1;
-	irq_evtchn[irq].mpsafe  = (irqflags & INTR_MPSAFE) != 0;
-
-	evtchn_to_irq[alloc_unbound.port] = irq;
-
-	unmask_evtchn(alloc_unbound.port);
-
-	mtx_unlock(&irq_evtchn[irq].lock);
-
-	if (irqp)
-		*irqp = irq;
-	return (0);
-}
-
-int 
-bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
-    unsigned int remote_port, const char *devname, driver_intr_t handler,
-    void *arg, unsigned long irqflags, unsigned int *irqp)
-{
-	struct evtchn_bind_interdomain bind_interdomain;
-	unsigned int irq;
-	int error;
-
-	irq = alloc_xen_irq();
-	if (irq < 0)
-		return irq;
-
-	mtx_lock(&irq_evtchn[irq].lock);
-
-	bind_interdomain.remote_dom  = remote_domain;
-	bind_interdomain.remote_port = remote_port;
-	error = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
-					    &bind_interdomain);
-	if (error) {
-		mtx_unlock(&irq_evtchn[irq].lock);
-		free_xen_irq(irq);
-		return (-error);
-	}
-
-	irq_evtchn[irq].handler = handler;
-	irq_evtchn[irq].arg     = arg;
-	irq_evtchn[irq].evtchn  = bind_interdomain.local_port;
-	irq_evtchn[irq].close   = 1;
-	irq_evtchn[irq].mpsafe  = (irqflags & INTR_MPSAFE) != 0;
-
-	evtchn_to_irq[bind_interdomain.local_port] = irq;
-
-	unmask_evtchn(bind_interdomain.local_port);
-
-	mtx_unlock(&irq_evtchn[irq].lock);
-
-	if (irqp)
-		*irqp = irq;
-	return (0);
-}
-
-
-int
-bind_caller_port_to_irqhandler(unsigned int caller_port,
-    const char *devname, driver_intr_t handler, void *arg,
-    unsigned long irqflags, unsigned int *irqp)
-{
-	unsigned int irq;
-
-	irq = alloc_xen_irq();
-	if (irq < 0)
-		return irq;
-
-	mtx_lock(&irq_evtchn[irq].lock);
-
-	irq_evtchn[irq].handler = handler;
-	irq_evtchn[irq].arg     = arg;
-	irq_evtchn[irq].evtchn  = caller_port;
-	irq_evtchn[irq].close   = 0;
-	irq_evtchn[irq].mpsafe  = (irqflags & INTR_MPSAFE) != 0;
-
-	evtchn_to_irq[caller_port] = irq;
-
-	unmask_evtchn(caller_port);
-
-	mtx_unlock(&irq_evtchn[irq].lock);
-
-	if (irqp)
-		*irqp = irq;
-	return (0);
-}
-
-void
-unbind_from_irqhandler(unsigned int irq)
-{
-	int evtchn;
-
-	mtx_lock(&irq_evtchn[irq].lock);
-
-	evtchn = evtchn_from_irq(irq);
-
-	if (is_valid_evtchn(evtchn)) {
-		evtchn_to_irq[evtchn] = -1;
-		mask_evtchn(evtchn);
-		if (irq_evtchn[irq].close) {
-			struct evtchn_close close = { .port = evtchn };
-			if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close))
-				panic("EVTCHNOP_close failed");
-		}
-	}
-
-	irq_evtchn[irq].handler = NULL;
-	irq_evtchn[irq].evtchn  = 0;
-
-	mtx_unlock(&irq_evtchn[irq].lock);
-
-	while (irq_evtchn[irq].in_handler)
-		cpu_relax();
-
-	free_xen_irq(irq);
-}
-
-void notify_remote_via_irq(int irq)
-{
-	int evtchn;
-
-	evtchn = evtchn_from_irq(irq);
-	if (is_valid_evtchn(evtchn))
-		notify_remote_via_evtchn(evtchn);
-}
-
-static inline unsigned long active_evtchns(unsigned int cpu, shared_info_t *sh,
-						unsigned int idx)
-{
-	return (sh->evtchn_pending[idx] & ~sh->evtchn_mask[idx]);
-}
-
-static void
-evtchn_interrupt(void *arg)
-{
-	unsigned int l1i, l2i, port;
-	unsigned long masked_l1, masked_l2;
-	/* XXX: All events are bound to vcpu0 but irq may be redirected. */
-	int cpu = 0; /*smp_processor_id();*/
-	driver_intr_t *handler;
-	void *handler_arg;
-	int irq, handler_mpsafe;
-	shared_info_t *s = HYPERVISOR_shared_info;
-	vcpu_info_t *v = &s->vcpu_info[cpu];
-	struct pcpu *pc = pcpu_find(cpu);
-	unsigned long l1, l2;
-
-	v->evtchn_upcall_pending = 0;
-
-#if 0
-#ifndef CONFIG_X86 /* No need for a barrier -- XCHG is a barrier on x86. */
-	/* Clear master flag /before/ clearing selector flag. */
-	wmb();
-#endif
-#endif
-
-	l1 = atomic_readandclear_long(&v->evtchn_pending_sel);
-
-	l1i = pc->pc_last_processed_l1i;
-	l2i = pc->pc_last_processed_l2i;
-
-	while (l1 != 0) {
-
-		l1i = (l1i + 1) % LONG_BIT;
-		masked_l1 = l1 & ((~0UL) << l1i);
-
-		if (masked_l1 == 0) { /* if we masked out all events, wrap around to the beginning */
-			l1i = LONG_BIT - 1;
-			l2i = LONG_BIT - 1;
-			continue;
-		}
-		l1i = __ffs(masked_l1);
-
-		do {
-			l2 = active_evtchns(cpu, s, l1i);
-
-			l2i = (l2i + 1) % LONG_BIT;
-			masked_l2 = l2 & ((~0UL) << l2i);
-
-			if (masked_l2 == 0) { /* if we masked out all events, move on */
-				l2i = LONG_BIT - 1;
-				break;
-			}
-			l2i = __ffs(masked_l2);
-
-			/* process port */
-			port = (l1i * LONG_BIT) + l2i;
-			synch_clear_bit(port, &s->evtchn_pending[0]);
-
-			irq = evtchn_to_irq[port];
-			if (irq < 0)
-				continue;
-
-			mtx_lock(&irq_evtchn[irq].lock);
-			handler = irq_evtchn[irq].handler;
-			handler_arg = irq_evtchn[irq].arg;
-			handler_mpsafe = irq_evtchn[irq].mpsafe;
-			if (unlikely(handler == NULL)) {
-				printf("Xen IRQ%d (port %d) has no handler!\n",
-				       irq, port);
-				mtx_unlock(&irq_evtchn[irq].lock);
-				continue;
-			}
-			irq_evtchn[irq].in_handler = 1;
-			mtx_unlock(&irq_evtchn[irq].lock);
-
-			//local_irq_enable();
-			if (!handler_mpsafe)
-				mtx_lock(&Giant);
-			handler(handler_arg);
-			if (!handler_mpsafe)
-				mtx_unlock(&Giant);
-			//local_irq_disable();
-
-			mtx_lock(&irq_evtchn[irq].lock);
-			irq_evtchn[irq].in_handler = 0;
-			mtx_unlock(&irq_evtchn[irq].lock);
-
-			/* if this is the final port processed, we'll pick up here+1 next time */
-			pc->pc_last_processed_l1i = l1i;
-			pc->pc_last_processed_l2i = l2i;
-
-		} while (l2i != LONG_BIT - 1);
-
-		l2 = active_evtchns(cpu, s, l1i);
-		if (l2 == 0) /* we handled all ports, so we can clear the selector bit */
-			l1 &= ~(1UL << l1i);
-	}
-}
-
-void
-irq_suspend(void)
-{
-	struct xenpci_softc *scp = device_get_softc(xenpci_device);
-
-	/*
-	 * Take our interrupt handler out of the list of handlers
-	 * that can handle this irq.
-	 */
-	if (scp->intr_cookie != NULL) {
-		if (BUS_TEARDOWN_INTR(device_get_parent(xenpci_device),
-			xenpci_device, scp->res_irq, scp->intr_cookie) != 0)
-			printf("intr teardown failed.. continuing\n");
-		scp->intr_cookie = NULL;
-	}
-}
-
-void
-irq_resume(void)
-{
-	struct xenpci_softc *scp = device_get_softc(xenpci_device);
-	int evtchn, irq;
-
-	for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++) {
-		mask_evtchn(evtchn);
-		evtchn_to_irq[evtchn] = -1;
-	}
-
-	for (irq = 0; irq < ARRAY_SIZE(irq_evtchn); irq++)
-		irq_evtchn[irq].evtchn = 0;
-
-	BUS_SETUP_INTR(device_get_parent(xenpci_device),
-	    xenpci_device, scp->res_irq, INTR_TYPE_MISC,
-	    NULL, evtchn_interrupt, NULL, &scp->intr_cookie);
-}
-
-int
-xenpci_irq_init(device_t device, struct xenpci_softc *scp)
-{
-	int irq, cpu;
-	int error;
-
-	mtx_init(&irq_alloc_lock, "xen-irq-lock", NULL, MTX_DEF);
-
-	for (irq = 0; irq < ARRAY_SIZE(irq_evtchn); irq++)
-		mtx_init(&irq_evtchn[irq].lock, "irq-evtchn", NULL, MTX_DEF);
-
-	for (cpu = 0; cpu < mp_ncpus; cpu++) {
-		pcpu_find(cpu)->pc_last_processed_l1i = LONG_BIT - 1;
-		pcpu_find(cpu)->pc_last_processed_l2i = LONG_BIT - 1;
-	}
-
-	error = BUS_SETUP_INTR(device_get_parent(device), device,
-	    scp->res_irq, INTR_MPSAFE|INTR_TYPE_MISC, NULL, evtchn_interrupt,
-	    NULL, &scp->intr_cookie);
-	if (error)
-		return (error);
-
-	xenpci_device = device;
-
-	return (0);
-}