[mirror_ubuntu-bionic-kernel.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>
 *
 */

#include <linux/kvm_host.h>

#include <asm/msidef.h>

#include "irq.h"

#include "ioapic.h"

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

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

void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
		int dest_id, int dest_mode, bool low_prio, int short_hand,
		unsigned long *deliver_bitmask)
{
	int i;
	struct kvm_vcpu *vcpu;

	if (dest_mode == 0 && dest_id == 0xff && low_prio)
		printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");

	bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
	for (i = 0; i < KVM_MAX_VCPUS; i++) {
		vcpu = kvm->vcpus[i];

		if (!vcpu || !kvm_apic_present(vcpu))
			continue;

		if (!kvm_apic_match_dest(vcpu, src, short_hand, dest_id,
					dest_mode))
			continue;

		__set_bit(i, deliver_bitmask);
	}

	if (low_prio) {
		vcpu = kvm_get_lowest_prio_vcpu(kvm, 0, deliver_bitmask);
		bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
		if (vcpu)
			__set_bit(vcpu->vcpu_id, deliver_bitmask);
	}
}

static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
		       struct kvm *kvm, int level)
{
	union kvm_ioapic_redirect_entry entry;

	entry.bits = 0;
	entry.fields.dest_id = (e->msi.address_lo &
			MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
	entry.fields.vector = (e->msi.data &
			MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
	entry.fields.dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
			(unsigned long *)&e->msi.address_lo);
	entry.fields.trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
			(unsigned long *)&e->msi.data);
	entry.fields.delivery_mode = test_bit(
			MSI_DATA_DELIVERY_MODE_SHIFT,
			(unsigned long *)&e->msi.data);

	/* TODO Deal with RH bit of MSI message address */
	return ioapic_deliver_entry(kvm, &entry);
}

/* This should be called with the kvm->lock mutex held
 * 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, int irq, int level)
{
	struct kvm_kernel_irq_routing_entry *e;
	unsigned long *irq_state, sig_level;
	int ret = -1;

	if (irq < KVM_IOAPIC_NUM_PINS) {
		irq_state = (unsigned long *)&kvm->arch.irq_states[irq];

		/* Logical OR for level trig interrupt */
		if (level)
			set_bit(irq_source_id, irq_state);
		else
			clear_bit(irq_source_id, irq_state);
		sig_level = !!(*irq_state);
	} else /* Deal with MSI/MSI-X */
		sig_level = 1;

	/* 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.
	 */
	list_for_each_entry(e, &kvm->irq_routing, link)
		if (e->gsi == irq) {
			int r = e->set(e, kvm, sig_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_kernel_irq_routing_entry *e;
	struct kvm_irq_ack_notifier *kian;
	struct hlist_node *n;
	unsigned gsi = pin;

	list_for_each_entry(e, &kvm->irq_routing, link)
		if (e->irqchip.irqchip == irqchip &&
		    e->irqchip.pin == pin) {
			gsi = e->gsi;
			break;
		}

	hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
		if (kian->gsi == gsi)
			kian->irq_acked(kian);
}

void kvm_register_irq_ack_notifier(struct kvm *kvm,
				   struct kvm_irq_ack_notifier *kian)
{
	hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
}

void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
{
	hlist_del_init(&kian->link);
}

/* The caller must hold kvm->lock mutex */
int kvm_request_irq_source_id(struct kvm *kvm)
{
	unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
	int irq_source_id = find_first_zero_bit(bitmap,
				sizeof(kvm->arch.irq_sources_bitmap));

	if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
		printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
		return -EFAULT;
	}

	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
	set_bit(irq_source_id, bitmap);

	return irq_source_id;
}

void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
{
	int i;

	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);

	if (irq_source_id < 0 ||
	    irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
		printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
		return;
	}
	for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
		clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
	clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
}

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

void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
				      struct kvm_irq_mask_notifier *kimn)
{
	hlist_del(&kimn->link);
}

void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
{
	struct kvm_irq_mask_notifier *kimn;
	struct hlist_node *n;

	hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
		if (kimn->irq == irq)
			kimn->func(kimn, mask);
}

static void __kvm_free_irq_routing(struct list_head *irq_routing)
{
	struct kvm_kernel_irq_routing_entry *e, *n;

	list_for_each_entry_safe(e, n, irq_routing, link)
		kfree(e);
}

void kvm_free_irq_routing(struct kvm *kvm)
{
	__kvm_free_irq_routing(&kvm->irq_routing);
}

static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
			       const struct kvm_irq_routing_entry *ue)
{
	int r = -EINVAL;
	int delta;

	e->gsi = ue->gsi;
	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;
			break;
		case KVM_IRQCHIP_PIC_SLAVE:
			e->set = kvm_set_pic_irq;
			delta = 8;
			break;
		case KVM_IRQCHIP_IOAPIC:
				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;
		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;
	}
	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 list_head irq_list = LIST_HEAD_INIT(irq_list);
	struct list_head tmp = LIST_HEAD_INIT(tmp);
	struct kvm_kernel_irq_routing_entry *e = NULL;
	unsigned i;
	int r;

	for (i = 0; i < nr; ++i) {
		r = -EINVAL;
		if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
			goto out;
		if (ue->flags)
			goto out;
		r = -ENOMEM;
		e = kzalloc(sizeof(*e), GFP_KERNEL);
		if (!e)
			goto out;
		r = setup_routing_entry(e, ue);
		if (r)
			goto out;
		++ue;
		list_add(&e->link, &irq_list);
		e = NULL;
	}

	mutex_lock(&kvm->lock);
	list_splice(&kvm->irq_routing, &tmp);
	INIT_LIST_HEAD(&kvm->irq_routing);
	list_splice(&irq_list, &kvm->irq_routing);
	INIT_LIST_HEAD(&irq_list);
	list_splice(&tmp, &irq_list);
	mutex_unlock(&kvm->lock);

	r = 0;

out:
	kfree(e);
	__kvm_free_irq_routing(&irq_list);
	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	*
	20	*/
	21
	22	#include <linux/kvm_host.h>
79950e10	23
79950e10	24	#include <asm/msidef.h>
79950e10	25
3de42dc0 XZ	26	#include "irq.h"
	27
	28	#include "ioapic.h"
	29
4925663a GN	30	static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
4925663a GN	31	struct kvm *kvm, int level)
399ec807 AK	32	{
399ec807 AK	33	#ifdef CONFIG_X86
4925663a GN	34	return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
	35	#else
	36	return -1;
399ec807 AK	37	#endif
	38	}
	39
4925663a GN	40	static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
4925663a GN	41	struct kvm *kvm, int level)
399ec807	42	{
4925663a	43	return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
399ec807 AK	44	}
399ec807 AK	45
343f94fe GN	46	void kvm_get_intr_delivery_bitmask(struct kvm kvm, struct kvm_lapic src,
	47	int dest_id, int dest_mode, bool low_prio, int short_hand,
	48	unsigned long *deliver_bitmask)
116191b6	49	{
74a3a8f1	50	int i;
116191b6 SY	51	struct kvm_vcpu *vcpu;
116191b6 SY	52
343f94fe GN	53	if (dest_mode == 0 && dest_id == 0xff && low_prio)
	54	printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
	55
74a3a8f1	56	bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
343f94fe GN	57	for (i = 0; i < KVM_MAX_VCPUS; i++) {
343f94fe GN	58	vcpu = kvm->vcpus[i];
74a3a8f1	59
343f94fe GN	60	if (!vcpu \|\| !kvm_apic_present(vcpu))
	61	continue;
	62
	63	if (!kvm_apic_match_dest(vcpu, src, short_hand, dest_id,
	64	dest_mode))
	65	continue;
	66
	67	__set_bit(i, deliver_bitmask);
	68	}
	69
	70	if (low_prio) {
	71	vcpu = kvm_get_lowest_prio_vcpu(kvm, 0, deliver_bitmask);
74a3a8f1	72	bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
343f94fe GN	73	if (vcpu)
343f94fe GN	74	__set_bit(vcpu->vcpu_id, deliver_bitmask);
116191b6 SY	75	}
	76	}
	77
4925663a GN	78	static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
4925663a GN	79	struct kvm *kvm, int level)
79950e10	80	{
116191b6	81	union kvm_ioapic_redirect_entry entry;
79950e10	82
116191b6 SY	83	entry.bits = 0;
	84	entry.fields.dest_id = (e->msi.address_lo &
	85	MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
	86	entry.fields.vector = (e->msi.data &
	87	MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
	88	entry.fields.dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
	89	(unsigned long *)&e->msi.address_lo);
	90	entry.fields.trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
	91	(unsigned long *)&e->msi.data);
	92	entry.fields.delivery_mode = test_bit(
	93	MSI_DATA_DELIVERY_MODE_SHIFT,
	94	(unsigned long *)&e->msi.data);
	95
	96	/* TODO Deal with RH bit of MSI message address */
a53c17d2	97	return ioapic_deliver_entry(kvm, &entry);
79950e10 SY	98	}
79950e10 SY	99
4925663a GN	100	/* This should be called with the kvm->lock mutex held
	101	* Return value:
	102	* < 0 Interrupt was ignored (masked or not delivered for other reasons)
	103	* = 0 Interrupt was coalesced (previous irq is still pending)
	104	* > 0 Number of CPUs interrupt was delivered to
	105	*/
	106	int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
3de42dc0	107	{
399ec807	108	struct kvm_kernel_irq_routing_entry *e;
79950e10	109	unsigned long *irq_state, sig_level;
4925663a	110	int ret = -1;
79950e10 SY	111
	112	if (irq < KVM_IOAPIC_NUM_PINS) {
	113	irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
5550af4d	114
79950e10 SY	115	/* Logical OR for level trig interrupt */
	116	if (level)
	117	set_bit(irq_source_id, irq_state);
	118	else
	119	clear_bit(irq_source_id, irq_state);
	120	sig_level = !!(*irq_state);
	121	} else /* Deal with MSI/MSI-X */
	122	sig_level = 1;
5550af4d	123
3de42dc0 XZ	124	/* Not possible to detect if the guest uses the PIC or the
	125	* IOAPIC. So set the bit in both. The guest will ignore
	126	* writes to the unused one.
	127	*/
399ec807	128	list_for_each_entry(e, &kvm->irq_routing, link)
4925663a GN	129	if (e->gsi == irq) {
	130	int r = e->set(e, kvm, sig_level);
	131	if (r < 0)
	132	continue;
	133
	134	ret = r + ((ret < 0) ? 0 : ret);
	135	}
	136	return ret;
3de42dc0 XZ	137	}
3de42dc0 XZ	138
44882eed	139	void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
3de42dc0	140	{
44882eed	141	struct kvm_kernel_irq_routing_entry *e;
3de42dc0 XZ	142	struct kvm_irq_ack_notifier *kian;
3de42dc0 XZ	143	struct hlist_node *n;
44882eed MT	144	unsigned gsi = pin;
	145
	146	list_for_each_entry(e, &kvm->irq_routing, link)
	147	if (e->irqchip.irqchip == irqchip &&
	148	e->irqchip.pin == pin) {
	149	gsi = e->gsi;
	150	break;
	151	}
3de42dc0 XZ	152
	153	hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
	154	if (kian->gsi == gsi)
	155	kian->irq_acked(kian);
	156	}
	157
	158	void kvm_register_irq_ack_notifier(struct kvm *kvm,
	159	struct kvm_irq_ack_notifier *kian)
	160	{
	161	hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
	162	}
	163
e19e30ef	164	void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
3de42dc0	165	{
fdd897e6	166	hlist_del_init(&kian->link);
3de42dc0	167	}
5550af4d SY	168
	169	/* The caller must hold kvm->lock mutex */
	170	int kvm_request_irq_source_id(struct kvm *kvm)
	171	{
	172	unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
	173	int irq_source_id = find_first_zero_bit(bitmap,
	174	sizeof(kvm->arch.irq_sources_bitmap));
61552367	175
5550af4d SY	176	if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
5550af4d SY	177	printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
61552367 MM	178	return -EFAULT;
	179	}
	180
	181	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
	182	set_bit(irq_source_id, bitmap);
	183
5550af4d SY	184	return irq_source_id;
	185	}
	186
	187	void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
	188	{
	189	int i;
	190
61552367 MM	191	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
	192
	193	if (irq_source_id < 0 \|\|
5550af4d SY	194	irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
	195	printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
	196	return;
	197	}
	198	for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
	199	clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
	200	clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
	201	}
75858a84 AK	202
	203	void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
	204	struct kvm_irq_mask_notifier *kimn)
	205	{
	206	kimn->irq = irq;
	207	hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
	208	}
	209
	210	void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
	211	struct kvm_irq_mask_notifier *kimn)
	212	{
	213	hlist_del(&kimn->link);
	214	}
	215
	216	void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
	217	{
	218	struct kvm_irq_mask_notifier *kimn;
	219	struct hlist_node *n;
	220
	221	hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
	222	if (kimn->irq == irq)
	223	kimn->func(kimn, mask);
	224	}
	225
399ec807 AK	226	static void __kvm_free_irq_routing(struct list_head *irq_routing)
	227	{
	228	struct kvm_kernel_irq_routing_entry e, n;
	229
	230	list_for_each_entry_safe(e, n, irq_routing, link)
	231	kfree(e);
	232	}
	233
	234	void kvm_free_irq_routing(struct kvm *kvm)
	235	{
	236	__kvm_free_irq_routing(&kvm->irq_routing);
	237	}
	238
cded19f3 HE	239	static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
cded19f3 HE	240	const struct kvm_irq_routing_entry *ue)
399ec807 AK	241	{
	242	int r = -EINVAL;
	243	int delta;
	244
	245	e->gsi = ue->gsi;
	246	switch (ue->type) {
	247	case KVM_IRQ_ROUTING_IRQCHIP:
	248	delta = 0;
	249	switch (ue->u.irqchip.irqchip) {
	250	case KVM_IRQCHIP_PIC_MASTER:
	251	e->set = kvm_set_pic_irq;
	252	break;
	253	case KVM_IRQCHIP_PIC_SLAVE:
4925663a	254	e->set = kvm_set_pic_irq;
399ec807 AK	255	delta = 8;
	256	break;
	257	case KVM_IRQCHIP_IOAPIC:
	258	e->set = kvm_set_ioapic_irq;
	259	break;
	260	default:
	261	goto out;
	262	}
	263	e->irqchip.irqchip = ue->u.irqchip.irqchip;
	264	e->irqchip.pin = ue->u.irqchip.pin + delta;
	265	break;
79950e10 SY	266	case KVM_IRQ_ROUTING_MSI:
	267	e->set = kvm_set_msi;
	268	e->msi.address_lo = ue->u.msi.address_lo;
	269	e->msi.address_hi = ue->u.msi.address_hi;
	270	e->msi.data = ue->u.msi.data;
	271	break;
399ec807 AK	272	default:
	273	goto out;
	274	}
	275	r = 0;
	276	out:
	277	return r;
	278	}
	279
	280
	281	int kvm_set_irq_routing(struct kvm *kvm,
	282	const struct kvm_irq_routing_entry *ue,
	283	unsigned nr,
	284	unsigned flags)
	285	{
	286	struct list_head irq_list = LIST_HEAD_INIT(irq_list);
	287	struct list_head tmp = LIST_HEAD_INIT(tmp);
	288	struct kvm_kernel_irq_routing_entry *e = NULL;
	289	unsigned i;
	290	int r;
	291
	292	for (i = 0; i < nr; ++i) {
	293	r = -EINVAL;
	294	if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
	295	goto out;
	296	if (ue->flags)
	297	goto out;
	298	r = -ENOMEM;
	299	e = kzalloc(sizeof(*e), GFP_KERNEL);
	300	if (!e)
	301	goto out;
	302	r = setup_routing_entry(e, ue);
	303	if (r)
	304	goto out;
	305	++ue;
	306	list_add(&e->link, &irq_list);
	307	e = NULL;
	308	}
	309
	310	mutex_lock(&kvm->lock);
	311	list_splice(&kvm->irq_routing, &tmp);
	312	INIT_LIST_HEAD(&kvm->irq_routing);
	313	list_splice(&irq_list, &kvm->irq_routing);
	314	INIT_LIST_HEAD(&irq_list);
	315	list_splice(&tmp, &irq_list);
	316	mutex_unlock(&kvm->lock);
	317
	318	r = 0;
	319
	320	out:
	321	kfree(e);
	322	__kvm_free_irq_routing(&irq_list);
	323	return r;
	324	}
	325
	326	#define IOAPIC_ROUTING_ENTRY(irq) \
	327	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
	328	.u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
	329	#define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
	330
	331	#ifdef CONFIG_X86
399ec807 AK	332	# define PIC_ROUTING_ENTRY(irq) \
	333	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
	334	.u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
	335	# define ROUTING_ENTRY2(irq) \
	336	IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
	337	#else
	338	# define ROUTING_ENTRY2(irq) \
	339	IOAPIC_ROUTING_ENTRY(irq)
	340	#endif
	341
	342	static const struct kvm_irq_routing_entry default_routing[] = {
	343	ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
	344	ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
	345	ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
	346	ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
	347	ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
	348	ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
	349	ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
	350	ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
	351	ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
	352	ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
	353	ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
	354	ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
	355	#ifdef CONFIG_IA64
	356	ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
	357	ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
	358	ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
	359	ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
	360	ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
	361	ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
	362	ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
	363	ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
	364	ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
	365	ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
	366	ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
	367	ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
	368	#endif
	369	};
	370
	371	int kvm_setup_default_irq_routing(struct kvm *kvm)
	372	{
	373	return kvm_set_irq_routing(kvm, default_routing,
	374	ARRAY_SIZE(default_routing), 0);
	375	}