[GitHub/mt8127/android_kernel_alcatel_ttab.git] / virt / kvm / irq_comm.c

/*
 * irq_comm.c: Common API for in kernel interrupt controller
 * Copyright (c) 2007, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 * Authors:
 *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
 *
 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 */

#include <linux/kvm_host.h>
#include <linux/slab.h>
#include <trace/events/kvm.h>

#include <asm/msidef.h>
#ifdef CONFIG_IA64
#include <asm/iosapic.h>
#endif

#include "irq.h"

#include "ioapic.h"

static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
			   struct kvm *kvm, int irq_source_id, int level)
{
#ifdef CONFIG_X86
	struct kvm_pic *pic = pic_irqchip(kvm);
	return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level);
#else
	return -1;
#endif
}

static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
			      struct kvm *kvm, int irq_source_id, int level)
{
	struct kvm_ioapic *ioapic = kvm->arch.vioapic;
	return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level);
}

inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
{
#ifdef CONFIG_IA64
	return irq->delivery_mode ==
		(IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
#else
	return irq->delivery_mode == APIC_DM_LOWEST;
#endif
}

int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
		struct kvm_lapic_irq *irq)
{
	int i, r = -1;
	struct kvm_vcpu *vcpu, *lowest = NULL;

	if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
			kvm_is_dm_lowest_prio(irq)) {
		printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
		irq->delivery_mode = APIC_DM_FIXED;
	}

	if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r))
		return r;

	kvm_for_each_vcpu(i, vcpu, kvm) {
		if (!kvm_apic_present(vcpu))
			continue;

		if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
					irq->dest_id, irq->dest_mode))
			continue;

		if (!kvm_is_dm_lowest_prio(irq)) {
			if (r < 0)
				r = 0;
			r += kvm_apic_set_irq(vcpu, irq);
		} else if (kvm_lapic_enabled(vcpu)) {
			if (!lowest)
				lowest = vcpu;
			else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
				lowest = vcpu;
		}
	}

	if (lowest)
		r = kvm_apic_set_irq(lowest, irq);

	return r;
}

int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
		struct kvm *kvm, int irq_source_id, int level)
{
	struct kvm_lapic_irq irq;

	if (!level)
		return -1;

	trace_kvm_msi_set_irq(e->msi.address_lo, e->msi.data);

	irq.dest_id = (e->msi.address_lo &
			MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
	irq.vector = (e->msi.data &
			MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
	irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
	irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
	irq.delivery_mode = e->msi.data & 0x700;
	irq.level = 1;
	irq.shorthand = 0;

	/* TODO Deal with RH bit of MSI message address */
	return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
}

int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
{
	struct kvm_kernel_irq_routing_entry route;

	if (!irqchip_in_kernel(kvm) || msi->flags != 0)
		return -EINVAL;

	route.msi.address_lo = msi->address_lo;
	route.msi.address_hi = msi->address_hi;
	route.msi.data = msi->data;

	return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1);
}

/*
 * Return value:
 *  < 0   Interrupt was ignored (masked or not delivered for other reasons)
 *  = 0   Interrupt was coalesced (previous irq is still pending)
 *  > 0   Number of CPUs interrupt was delivered to
 */
int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level)
{
	struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS];
	int ret = -1, i = 0;
	struct kvm_irq_routing_table *irq_rt;
	struct hlist_node *n;

	trace_kvm_set_irq(irq, level, irq_source_id);

	/* Not possible to detect if the guest uses the PIC or the
	 * IOAPIC.  So set the bit in both. The guest will ignore
	 * writes to the unused one.
	 */
	rcu_read_lock();
	irq_rt = rcu_dereference(kvm->irq_routing);
	if (irq < irq_rt->nr_rt_entries)
		hlist_for_each_entry(e, n, &irq_rt->map[irq], link)
			irq_set[i++] = *e;
	rcu_read_unlock();

	while(i--) {
		int r;
		r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level);
		if (r < 0)
			continue;

		ret = r + ((ret < 0) ? 0 : ret);
	}

	return ret;
}

void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
{
	struct kvm_irq_ack_notifier *kian;
	struct hlist_node *n;
	int gsi;

	trace_kvm_ack_irq(irqchip, pin);

	rcu_read_lock();
	gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
	if (gsi != -1)
		hlist_for_each_entry_rcu(kian, n, &kvm->irq_ack_notifier_list,
					 link)
			if (kian->gsi == gsi)
				kian->irq_acked(kian);
	rcu_read_unlock();
}

void kvm_register_irq_ack_notifier(struct kvm *kvm,
				   struct kvm_irq_ack_notifier *kian)
{
	mutex_lock(&kvm->irq_lock);
	hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
	mutex_unlock(&kvm->irq_lock);
}

void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
				    struct kvm_irq_ack_notifier *kian)
{
	mutex_lock(&kvm->irq_lock);
	hlist_del_init_rcu(&kian->link);
	mutex_unlock(&kvm->irq_lock);
	synchronize_rcu();
}

int kvm_request_irq_source_id(struct kvm *kvm)
{
	unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
	int irq_source_id;

	mutex_lock(&kvm->irq_lock);
	irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG);

	if (irq_source_id >= BITS_PER_LONG) {
		printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
		irq_source_id = -EFAULT;
		goto unlock;
	}

	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
#ifdef CONFIG_X86
	ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
#endif
	set_bit(irq_source_id, bitmap);
unlock:
	mutex_unlock(&kvm->irq_lock);

	return irq_source_id;
}

void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
{
	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
#ifdef CONFIG_X86
	ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
#endif

	mutex_lock(&kvm->irq_lock);
	if (irq_source_id < 0 ||
	    irq_source_id >= BITS_PER_LONG) {
		printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
		goto unlock;
	}
	clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
	if (!irqchip_in_kernel(kvm))
		goto unlock;

	kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id);
#ifdef CONFIG_X86
	kvm_pic_clear_all(pic_irqchip(kvm), irq_source_id);
#endif
unlock:
	mutex_unlock(&kvm->irq_lock);
}

void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
				    struct kvm_irq_mask_notifier *kimn)
{
	mutex_lock(&kvm->irq_lock);
	kimn->irq = irq;
	hlist_add_head_rcu(&kimn->link, &kvm->mask_notifier_list);
	mutex_unlock(&kvm->irq_lock);
}

void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
				      struct kvm_irq_mask_notifier *kimn)
{
	mutex_lock(&kvm->irq_lock);
	hlist_del_rcu(&kimn->link);
	mutex_unlock(&kvm->irq_lock);
	synchronize_rcu();
}

void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
			     bool mask)
{
	struct kvm_irq_mask_notifier *kimn;
	struct hlist_node *n;
	int gsi;

	rcu_read_lock();
	gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
	if (gsi != -1)
		hlist_for_each_entry_rcu(kimn, n, &kvm->mask_notifier_list, link)
			if (kimn->irq == gsi)
				kimn->func(kimn, mask);
	rcu_read_unlock();
}

void kvm_free_irq_routing(struct kvm *kvm)
{
	/* Called only during vm destruction. Nobody can use the pointer
	   at this stage */
	kfree(kvm->irq_routing);
}

static int setup_routing_entry(struct kvm_irq_routing_table *rt,
			       struct kvm_kernel_irq_routing_entry *e,
			       const struct kvm_irq_routing_entry *ue)
{
	int r = -EINVAL;
	int delta;
	unsigned max_pin;
	struct kvm_kernel_irq_routing_entry *ei;
	struct hlist_node *n;

	/*
	 * Do not allow GSI to be mapped to the same irqchip more than once.
	 * Allow only one to one mapping between GSI and MSI.
	 */
	hlist_for_each_entry(ei, n, &rt->map[ue->gsi], link)
		if (ei->type == KVM_IRQ_ROUTING_MSI ||
		    ue->type == KVM_IRQ_ROUTING_MSI ||
		    ue->u.irqchip.irqchip == ei->irqchip.irqchip)
			return r;

	e->gsi = ue->gsi;
	e->type = ue->type;
	switch (ue->type) {
	case KVM_IRQ_ROUTING_IRQCHIP:
		delta = 0;
		switch (ue->u.irqchip.irqchip) {
		case KVM_IRQCHIP_PIC_MASTER:
			e->set = kvm_set_pic_irq;
			max_pin = PIC_NUM_PINS;
			break;
		case KVM_IRQCHIP_PIC_SLAVE:
			e->set = kvm_set_pic_irq;
			max_pin = PIC_NUM_PINS;
			delta = 8;
			break;
		case KVM_IRQCHIP_IOAPIC:
			max_pin = KVM_IOAPIC_NUM_PINS;
			e->set = kvm_set_ioapic_irq;
			break;
		default:
			goto out;
		}
		e->irqchip.irqchip = ue->u.irqchip.irqchip;
		e->irqchip.pin = ue->u.irqchip.pin + delta;
		if (e->irqchip.pin >= max_pin)
			goto out;
		rt->chip[ue->u.irqchip.irqchip][e->irqchip.pin] = ue->gsi;
		break;
	case KVM_IRQ_ROUTING_MSI:
		e->set = kvm_set_msi;
		e->msi.address_lo = ue->u.msi.address_lo;
		e->msi.address_hi = ue->u.msi.address_hi;
		e->msi.data = ue->u.msi.data;
		break;
	default:
		goto out;
	}

	hlist_add_head(&e->link, &rt->map[e->gsi]);
	r = 0;
out:
	return r;
}


int kvm_set_irq_routing(struct kvm *kvm,
			const struct kvm_irq_routing_entry *ue,
			unsigned nr,
			unsigned flags)
{
	struct kvm_irq_routing_table *new, *old;
	u32 i, j, nr_rt_entries = 0;
	int r;

	for (i = 0; i < nr; ++i) {
		if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
			return -EINVAL;
		nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
	}

	nr_rt_entries += 1;

	new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head))
		      + (nr * sizeof(struct kvm_kernel_irq_routing_entry)),
		      GFP_KERNEL);

	if (!new)
		return -ENOMEM;

	new->rt_entries = (void *)&new->map[nr_rt_entries];

	new->nr_rt_entries = nr_rt_entries;
	for (i = 0; i < 3; i++)
		for (j = 0; j < KVM_IOAPIC_NUM_PINS; j++)
			new->chip[i][j] = -1;

	for (i = 0; i < nr; ++i) {
		r = -EINVAL;
		if (ue->flags)
			goto out;
		r = setup_routing_entry(new, &new->rt_entries[i], ue);
		if (r)
			goto out;
		++ue;
	}

	mutex_lock(&kvm->irq_lock);
	old = kvm->irq_routing;
	kvm_irq_routing_update(kvm, new);
	mutex_unlock(&kvm->irq_lock);

	synchronize_rcu();

	new = old;
	r = 0;

out:
	kfree(new);
	return r;
}

#define IOAPIC_ROUTING_ENTRY(irq) \
	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,	\
	  .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
#define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)

#ifdef CONFIG_X86
#  define PIC_ROUTING_ENTRY(irq) \
	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,	\
	  .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
#  define ROUTING_ENTRY2(irq) \
	IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
#else
#  define ROUTING_ENTRY2(irq) \
	IOAPIC_ROUTING_ENTRY(irq)
#endif

static const struct kvm_irq_routing_entry default_routing[] = {
	ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
	ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
	ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
	ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
	ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
	ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
	ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
	ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
	ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
	ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
	ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
	ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
#ifdef CONFIG_IA64
	ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
	ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
	ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
	ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
	ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
	ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
	ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
	ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
	ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
	ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
	ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
	ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
#endif
};

int kvm_setup_default_irq_routing(struct kvm *kvm)
{
	return kvm_set_irq_routing(kvm, default_routing,
				   ARRAY_SIZE(default_routing), 0);
}
Commit	Line	Data
3de42dc0 XZ	1	/*
	2	* irq_comm.c: Common API for in kernel interrupt controller
	3	* Copyright (c) 2007, Intel Corporation.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along with
	15	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	16	* Place - Suite 330, Boston, MA 02111-1307 USA.
	17	* Authors:
	18	* Yaozu (Eddie) Dong <Eddie.dong@intel.com>
	19	*
9611c187	20	* Copyright 2010 Red Hat, Inc. and/or its affiliates.
3de42dc0 XZ	21	*/
	22
	23	#include <linux/kvm_host.h>
5a0e3ad6	24	#include <linux/slab.h>
229456fc	25	#include <trace/events/kvm.h>
79950e10	26
79950e10	27	#include <asm/msidef.h>
58c2dde1 GN	28	#ifdef CONFIG_IA64
	29	#include <asm/iosapic.h>
	30	#endif
79950e10	31
3de42dc0 XZ	32	#include "irq.h"
	33
	34	#include "ioapic.h"
	35
4925663a	36	static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
1a6e4a8c	37	struct kvm *kvm, int irq_source_id, int level)
399ec807 AK	38	{
399ec807 AK	39	#ifdef CONFIG_X86
1a6e4a8c	40	struct kvm_pic *pic = pic_irqchip(kvm);
1a577b72	41	return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level);
4925663a GN	42	#else
4925663a GN	43	return -1;
399ec807 AK	44	#endif
	45	}
	46
4925663a	47	static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
1a6e4a8c	48	struct kvm *kvm, int irq_source_id, int level)
399ec807	49	{
1a6e4a8c	50	struct kvm_ioapic *ioapic = kvm->arch.vioapic;
1a577b72	51	return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level);
399ec807 AK	52	}
399ec807 AK	53
58c2dde1	54	inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
116191b6	55	{
58c2dde1 GN	56	#ifdef CONFIG_IA64
	57	return irq->delivery_mode ==
	58	(IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
	59	#else
	60	return irq->delivery_mode == APIC_DM_LOWEST;
	61	#endif
	62	}
116191b6	63
58c2dde1 GN	64	int kvm_irq_delivery_to_apic(struct kvm kvm, struct kvm_lapic src,
	65	struct kvm_lapic_irq *irq)
	66	{
	67	int i, r = -1;
	68	struct kvm_vcpu vcpu, lowest = NULL;
	69
	70	if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
1e08ec4a	71	kvm_is_dm_lowest_prio(irq)) {
343f94fe	72	printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
1e08ec4a GN	73	irq->delivery_mode = APIC_DM_FIXED;
	74	}
	75
	76	if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r))
	77	return r;
343f94fe	78
988a2cae GN	79	kvm_for_each_vcpu(i, vcpu, kvm) {
988a2cae GN	80	if (!kvm_apic_present(vcpu))
343f94fe GN	81	continue;
343f94fe GN	82
58c2dde1 GN	83	if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
58c2dde1 GN	84	irq->dest_id, irq->dest_mode))
343f94fe GN	85	continue;
343f94fe GN	86
58c2dde1 GN	87	if (!kvm_is_dm_lowest_prio(irq)) {
	88	if (r < 0)
	89	r = 0;
	90	r += kvm_apic_set_irq(vcpu, irq);
aefd18f0	91	} else if (kvm_lapic_enabled(vcpu)) {
58c2dde1 GN	92	if (!lowest)
	93	lowest = vcpu;
	94	else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
	95	lowest = vcpu;
e1035715	96	}
343f94fe GN	97	}
343f94fe GN	98
58c2dde1 GN	99	if (lowest)
	100	r = kvm_apic_set_irq(lowest, irq);
	101
	102	return r;
116191b6 SY	103	}
116191b6 SY	104
bd2b53b2 MT	105	int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
bd2b53b2 MT	106	struct kvm *kvm, int irq_source_id, int level)
79950e10	107	{
58c2dde1	108	struct kvm_lapic_irq irq;
79950e10	109
1a6e4a8c GN	110	if (!level)
	111	return -1;
	112
1000ff8d GN	113	trace_kvm_msi_set_irq(e->msi.address_lo, e->msi.data);
1000ff8d GN	114
58c2dde1	115	irq.dest_id = (e->msi.address_lo &
116191b6	116	MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
58c2dde1	117	irq.vector = (e->msi.data &
116191b6	118	MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
58c2dde1 GN	119	irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
	120	irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
	121	irq.delivery_mode = e->msi.data & 0x700;
	122	irq.level = 1;
	123	irq.shorthand = 0;
116191b6 SY	124
116191b6 SY	125	/* TODO Deal with RH bit of MSI message address */
58c2dde1	126	return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
79950e10 SY	127	}
79950e10 SY	128
07975ad3 JK	129	int kvm_send_userspace_msi(struct kvm kvm, struct kvm_msi msi)
	130	{
	131	struct kvm_kernel_irq_routing_entry route;
	132
	133	if (!irqchip_in_kernel(kvm) \|\| msi->flags != 0)
	134	return -EINVAL;
	135
	136	route.msi.address_lo = msi->address_lo;
	137	route.msi.address_hi = msi->address_hi;
	138	route.msi.data = msi->data;
	139
	140	return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1);
	141	}
	142
680b3648	143	/*
4925663a GN	144	* Return value:
	145	* < 0 Interrupt was ignored (masked or not delivered for other reasons)
	146	* = 0 Interrupt was coalesced (previous irq is still pending)
	147	* > 0 Number of CPUs interrupt was delivered to
	148	*/
46e624b9	149	int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level)
3de42dc0	150	{
eba0226b GN	151	struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS];
eba0226b GN	152	int ret = -1, i = 0;
46e624b9 GN	153	struct kvm_irq_routing_table *irq_rt;
46e624b9 GN	154	struct hlist_node *n;
79950e10	155
ae8c1c40	156	trace_kvm_set_irq(irq, level, irq_source_id);
229456fc	157
3de42dc0 XZ	158	/* Not possible to detect if the guest uses the PIC or the
	159	* IOAPIC. So set the bit in both. The guest will ignore
	160	* writes to the unused one.
	161	*/
e42bba90 GN	162	rcu_read_lock();
e42bba90 GN	163	irq_rt = rcu_dereference(kvm->irq_routing);
46e624b9	164	if (irq < irq_rt->nr_rt_entries)
eba0226b GN	165	hlist_for_each_entry(e, n, &irq_rt->map[irq], link)
eba0226b GN	166	irq_set[i++] = *e;
e42bba90	167	rcu_read_unlock();
eba0226b GN	168
	169	while(i--) {
	170	int r;
	171	r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level);
	172	if (r < 0)
	173	continue;
	174
	175	ret = r + ((ret < 0) ? 0 : ret);
	176	}
	177
4925663a	178	return ret;
3de42dc0 XZ	179	}
3de42dc0 XZ	180
44882eed	181	void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
3de42dc0 XZ	182	{
	183	struct kvm_irq_ack_notifier *kian;
	184	struct hlist_node *n;
3e71f88b	185	int gsi;
44882eed	186
229456fc MT	187	trace_kvm_ack_irq(irqchip, pin);
229456fc MT	188
e42bba90 GN	189	rcu_read_lock();
e42bba90 GN	190	gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
3e71f88b	191	if (gsi != -1)
280aa177 GN	192	hlist_for_each_entry_rcu(kian, n, &kvm->irq_ack_notifier_list,
280aa177 GN	193	link)
3e71f88b GN	194	if (kian->gsi == gsi)
3e71f88b GN	195	kian->irq_acked(kian);
280aa177	196	rcu_read_unlock();
3de42dc0 XZ	197	}
	198
	199	void kvm_register_irq_ack_notifier(struct kvm *kvm,
	200	struct kvm_irq_ack_notifier *kian)
	201	{
fa40a821	202	mutex_lock(&kvm->irq_lock);
280aa177	203	hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
fa40a821	204	mutex_unlock(&kvm->irq_lock);
3de42dc0 XZ	205	}
3de42dc0 XZ	206
fa40a821 MT	207	void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
fa40a821 MT	208	struct kvm_irq_ack_notifier *kian)
3de42dc0	209	{
fa40a821	210	mutex_lock(&kvm->irq_lock);
280aa177	211	hlist_del_init_rcu(&kian->link);
fa40a821	212	mutex_unlock(&kvm->irq_lock);
280aa177	213	synchronize_rcu();
3de42dc0	214	}
5550af4d	215
5550af4d SY	216	int kvm_request_irq_source_id(struct kvm *kvm)
	217	{
	218	unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
fa40a821 MT	219	int irq_source_id;
	220
	221	mutex_lock(&kvm->irq_lock);
cd5a2685	222	irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG);
61552367	223
cd5a2685	224	if (irq_source_id >= BITS_PER_LONG) {
5550af4d	225	printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
0c6ddceb JS	226	irq_source_id = -EFAULT;
0c6ddceb JS	227	goto unlock;
61552367 MM	228	}
	229
	230	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
7a84428a AW	231	#ifdef CONFIG_X86
	232	ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
	233	#endif
61552367	234	set_bit(irq_source_id, bitmap);
0c6ddceb	235	unlock:
fa40a821	236	mutex_unlock(&kvm->irq_lock);
61552367	237
5550af4d SY	238	return irq_source_id;
	239	}
	240
	241	void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
	242	{
61552367	243	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
7a84428a AW	244	#ifdef CONFIG_X86
	245	ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
	246	#endif
61552367	247
fa40a821	248	mutex_lock(&kvm->irq_lock);
61552367	249	if (irq_source_id < 0 \|\|
cd5a2685	250	irq_source_id >= BITS_PER_LONG) {
5550af4d	251	printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
0c6ddceb	252	goto unlock;
5550af4d	253	}
e50212bb MT	254	clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
	255	if (!irqchip_in_kernel(kvm))
	256	goto unlock;
	257
1a577b72	258	kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id);
1a6e4a8c	259	#ifdef CONFIG_X86
1a577b72	260	kvm_pic_clear_all(pic_irqchip(kvm), irq_source_id);
1a6e4a8c	261	#endif
0c6ddceb	262	unlock:
fa40a821	263	mutex_unlock(&kvm->irq_lock);
5550af4d	264	}
75858a84 AK	265
	266	void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
	267	struct kvm_irq_mask_notifier *kimn)
	268	{
fa40a821	269	mutex_lock(&kvm->irq_lock);
75858a84	270	kimn->irq = irq;
280aa177	271	hlist_add_head_rcu(&kimn->link, &kvm->mask_notifier_list);
fa40a821	272	mutex_unlock(&kvm->irq_lock);
75858a84 AK	273	}
	274
	275	void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
	276	struct kvm_irq_mask_notifier *kimn)
	277	{
fa40a821	278	mutex_lock(&kvm->irq_lock);
280aa177	279	hlist_del_rcu(&kimn->link);
fa40a821	280	mutex_unlock(&kvm->irq_lock);
280aa177	281	synchronize_rcu();
75858a84 AK	282	}
75858a84 AK	283
4a994358 GN	284	void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
4a994358 GN	285	bool mask)
75858a84 AK	286	{
	287	struct kvm_irq_mask_notifier *kimn;
	288	struct hlist_node *n;
4a994358	289	int gsi;
75858a84	290
280aa177	291	rcu_read_lock();
4a994358 GN	292	gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
	293	if (gsi != -1)
	294	hlist_for_each_entry_rcu(kimn, n, &kvm->mask_notifier_list, link)
	295	if (kimn->irq == gsi)
	296	kimn->func(kimn, mask);
280aa177	297	rcu_read_unlock();
75858a84 AK	298	}
75858a84 AK	299
399ec807 AK	300	void kvm_free_irq_routing(struct kvm *kvm)
399ec807 AK	301	{
e42bba90 GN	302	/* Called only during vm destruction. Nobody can use the pointer
e42bba90 GN	303	at this stage */
46e624b9	304	kfree(kvm->irq_routing);
399ec807 AK	305	}
399ec807 AK	306
46e624b9 GN	307	static int setup_routing_entry(struct kvm_irq_routing_table *rt,
46e624b9 GN	308	struct kvm_kernel_irq_routing_entry *e,
cded19f3	309	const struct kvm_irq_routing_entry *ue)
399ec807 AK	310	{
	311	int r = -EINVAL;
	312	int delta;
d72118ce	313	unsigned max_pin;
46e624b9 GN	314	struct kvm_kernel_irq_routing_entry *ei;
	315	struct hlist_node *n;
	316
	317	/*
	318	* Do not allow GSI to be mapped to the same irqchip more than once.
	319	* Allow only one to one mapping between GSI and MSI.
	320	*/
	321	hlist_for_each_entry(ei, n, &rt->map[ue->gsi], link)
	322	if (ei->type == KVM_IRQ_ROUTING_MSI \|\|
f2ebd422	323	ue->type == KVM_IRQ_ROUTING_MSI \|\|
46e624b9 GN	324	ue->u.irqchip.irqchip == ei->irqchip.irqchip)
46e624b9 GN	325	return r;
399ec807 AK	326
399ec807 AK	327	e->gsi = ue->gsi;
5116d8f6	328	e->type = ue->type;
399ec807 AK	329	switch (ue->type) {
	330	case KVM_IRQ_ROUTING_IRQCHIP:
	331	delta = 0;
	332	switch (ue->u.irqchip.irqchip) {
	333	case KVM_IRQCHIP_PIC_MASTER:
	334	e->set = kvm_set_pic_irq;
93b6547e	335	max_pin = PIC_NUM_PINS;
399ec807 AK	336	break;
399ec807 AK	337	case KVM_IRQCHIP_PIC_SLAVE:
4925663a	338	e->set = kvm_set_pic_irq;
93b6547e	339	max_pin = PIC_NUM_PINS;
399ec807 AK	340	delta = 8;
	341	break;
	342	case KVM_IRQCHIP_IOAPIC:
d72118ce	343	max_pin = KVM_IOAPIC_NUM_PINS;
efbc100c	344	e->set = kvm_set_ioapic_irq;
399ec807 AK	345	break;
	346	default:
	347	goto out;
	348	}
	349	e->irqchip.irqchip = ue->u.irqchip.irqchip;
	350	e->irqchip.pin = ue->u.irqchip.pin + delta;
d72118ce	351	if (e->irqchip.pin >= max_pin)
3e71f88b GN	352	goto out;
3e71f88b GN	353	rt->chip[ue->u.irqchip.irqchip][e->irqchip.pin] = ue->gsi;
399ec807	354	break;
79950e10 SY	355	case KVM_IRQ_ROUTING_MSI:
	356	e->set = kvm_set_msi;
	357	e->msi.address_lo = ue->u.msi.address_lo;
	358	e->msi.address_hi = ue->u.msi.address_hi;
	359	e->msi.data = ue->u.msi.data;
	360	break;
399ec807 AK	361	default:
	362	goto out;
	363	}
46e624b9 GN	364
46e624b9 GN	365	hlist_add_head(&e->link, &rt->map[e->gsi]);
399ec807 AK	366	r = 0;
	367	out:
	368	return r;
	369	}
	370
	371
	372	int kvm_set_irq_routing(struct kvm *kvm,
	373	const struct kvm_irq_routing_entry *ue,
	374	unsigned nr,
	375	unsigned flags)
	376	{
46e624b9	377	struct kvm_irq_routing_table new, old;
3e71f88b	378	u32 i, j, nr_rt_entries = 0;
399ec807 AK	379	int r;
399ec807 AK	380
46e624b9 GN	381	for (i = 0; i < nr; ++i) {
	382	if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
	383	return -EINVAL;
	384	nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
	385	}
	386
	387	nr_rt_entries += 1;
	388
	389	new = kzalloc(sizeof(new) + (nr_rt_entries sizeof(struct hlist_head))
	390	+ (nr * sizeof(struct kvm_kernel_irq_routing_entry)),
	391	GFP_KERNEL);
	392
	393	if (!new)
	394	return -ENOMEM;
	395
	396	new->rt_entries = (void *)&new->map[nr_rt_entries];
	397
	398	new->nr_rt_entries = nr_rt_entries;
3e71f88b GN	399	for (i = 0; i < 3; i++)
	400	for (j = 0; j < KVM_IOAPIC_NUM_PINS; j++)
	401	new->chip[i][j] = -1;
46e624b9	402
399ec807 AK	403	for (i = 0; i < nr; ++i) {
399ec807 AK	404	r = -EINVAL;
399ec807 AK	405	if (ue->flags)
399ec807 AK	406	goto out;
46e624b9	407	r = setup_routing_entry(new, &new->rt_entries[i], ue);
399ec807 AK	408	if (r)
	409	goto out;
	410	++ue;
399ec807 AK	411	}
399ec807 AK	412
fa40a821	413	mutex_lock(&kvm->irq_lock);
46e624b9	414	old = kvm->irq_routing;
bd2b53b2	415	kvm_irq_routing_update(kvm, new);
fa40a821	416	mutex_unlock(&kvm->irq_lock);
bd2b53b2	417
e42bba90	418	synchronize_rcu();
399ec807	419
46e624b9	420	new = old;
399ec807 AK	421	r = 0;
	422
	423	out:
46e624b9	424	kfree(new);
399ec807 AK	425	return r;
	426	}
	427
	428	#define IOAPIC_ROUTING_ENTRY(irq) \
	429	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
	430	.u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
	431	#define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
	432
	433	#ifdef CONFIG_X86
399ec807 AK	434	# define PIC_ROUTING_ENTRY(irq) \
	435	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
	436	.u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
	437	# define ROUTING_ENTRY2(irq) \
	438	IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
	439	#else
	440	# define ROUTING_ENTRY2(irq) \
	441	IOAPIC_ROUTING_ENTRY(irq)
	442	#endif
	443
	444	static const struct kvm_irq_routing_entry default_routing[] = {
	445	ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
	446	ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
	447	ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
	448	ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
	449	ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
	450	ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
	451	ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
	452	ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
	453	ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
	454	ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
	455	ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
	456	ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
	457	#ifdef CONFIG_IA64
	458	ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
	459	ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
	460	ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
	461	ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
	462	ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
	463	ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
	464	ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
	465	ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
	466	ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
	467	ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
	468	ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
	469	ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
	470	#endif
	471	};
	472
	473	int kvm_setup_default_irq_routing(struct kvm *kvm)
	474	{
	475	return kvm_set_irq_routing(kvm, default_routing,
	476	ARRAY_SIZE(default_routing), 0);
	477	}