summaryrefslogtreecommitdiff
path: root/arch/arm64/kvm/vgic/vgic-irqfd.c
blob: 79f8899b234cf769afd5d47b08a5c0ac1a532efe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2015, 2016 ARM Ltd.
 */

#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <trace/events/kvm.h>
#include <kvm/arm_vgic.h>
#include "vgic.h"

/**
 * vgic_irqfd_set_irq: inject the IRQ corresponding to the
 * irqchip routing entry
 *
 * This is the entry point for irqfd IRQ injection
 */
static int vgic_irqfd_set_irq(struct kvm_kernel_irq_routing_entry *e,
			struct kvm *kvm, int irq_source_id,
			int level, bool line_status)
{
	unsigned int spi_id = e->irqchip.pin + VGIC_NR_PRIVATE_IRQS;

	if (!vgic_valid_spi(kvm, spi_id))
		return -EINVAL;
	return kvm_vgic_inject_irq(kvm, 0, spi_id, level, NULL);
}

/**
 * kvm_set_routing_entry: populate a kvm routing entry
 * from a user routing entry
 *
 * @kvm: the VM this entry is applied to
 * @e: kvm kernel routing entry handle
 * @ue: user api routing entry handle
 * return 0 on success, -EINVAL on errors.
 */
int kvm_set_routing_entry(struct kvm *kvm,
			  struct kvm_kernel_irq_routing_entry *e,
			  const struct kvm_irq_routing_entry *ue)
{
	int r = -EINVAL;

	switch (ue->type) {
	case KVM_IRQ_ROUTING_IRQCHIP:
		e->set = vgic_irqfd_set_irq;
		e->irqchip.irqchip = ue->u.irqchip.irqchip;
		e->irqchip.pin = ue->u.irqchip.pin;
		if ((e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS) ||
		    (e->irqchip.irqchip >= KVM_NR_IRQCHIPS))
			goto out;
		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;
		e->msi.flags = ue->flags;
		e->msi.devid = ue->u.msi.devid;
		break;
	default:
		goto out;
	}
	r = 0;
out:
	return r;
}

static void kvm_populate_msi(struct kvm_kernel_irq_routing_entry *e,
			     struct kvm_msi *msi)
{
	msi->address_lo = e->msi.address_lo;
	msi->address_hi = e->msi.address_hi;
	msi->data = e->msi.data;
	msi->flags = e->msi.flags;
	msi->devid = e->msi.devid;
}
/**
 * kvm_set_msi: inject the MSI corresponding to the
 * MSI routing entry
 *
 * This is the entry point for irqfd MSI injection
 * and userspace MSI injection.
 */
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
		struct kvm *kvm, int irq_source_id,
		int level, bool line_status)
{
	struct kvm_msi msi;

	if (!vgic_has_its(kvm))
		return -ENODEV;

	if (!level)
		return -1;

	kvm_populate_msi(e, &msi);
	return vgic_its_inject_msi(kvm, &msi);
}

/**
 * kvm_arch_set_irq_inatomic: fast-path for irqfd injection
 */
int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
			      struct kvm *kvm, int irq_source_id, int level,
			      bool line_status)
{
	if (!level)
		return -EWOULDBLOCK;

	switch (e->type) {
	case KVM_IRQ_ROUTING_MSI: {
		struct kvm_msi msi;

		if (!vgic_has_its(kvm))
			break;

		kvm_populate_msi(e, &msi);
		return vgic_its_inject_cached_translation(kvm, &msi);
	}

	case KVM_IRQ_ROUTING_IRQCHIP:
		/*
		 * Injecting SPIs is always possible in atomic context
		 * as long as the damn vgic is initialized.
		 */
		if (unlikely(!vgic_initialized(kvm)))
			break;
		return vgic_irqfd_set_irq(e, kvm, irq_source_id, 1, line_status);
	}

	return -EWOULDBLOCK;
}

int kvm_vgic_setup_default_irq_routing(struct kvm *kvm)
{
	struct kvm_irq_routing_entry *entries;
	struct vgic_dist *dist = &kvm->arch.vgic;
	u32 nr = dist->nr_spis;
	int i, ret;

	entries = kcalloc(nr, sizeof(*entries), GFP_KERNEL);
	if (!entries)
		return -ENOMEM;

	for (i = 0; i < nr; i++) {
		entries[i].gsi = i;
		entries[i].type = KVM_IRQ_ROUTING_IRQCHIP;
		entries[i].u.irqchip.irqchip = 0;
		entries[i].u.irqchip.pin = i;
	}
	ret = kvm_set_irq_routing(kvm, entries, nr, 0);
	kfree(entries);
	return ret;
}