1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2015, 2016 ARM Ltd.
4 */
5
6 #include <linux/kvm.h>
7 #include <linux/kvm_host.h>
8 #include <trace/events/kvm.h>
9 #include <kvm/arm_vgic.h>
10 #include "vgic.h"
11
12 /**
13 * vgic_irqfd_set_irq: inject the IRQ corresponding to the
14 * irqchip routing entry
15 *
16 * This is the entry point for irqfd IRQ injection
17 */
vgic_irqfd_set_irq(struct kvm_kernel_irq_routing_entry * e,struct kvm * kvm,int irq_source_id,int level,bool line_status)18 static int vgic_irqfd_set_irq(struct kvm_kernel_irq_routing_entry *e,
19 struct kvm *kvm, int irq_source_id,
20 int level, bool line_status)
21 {
22 unsigned int spi_id = e->irqchip.pin + VGIC_NR_PRIVATE_IRQS;
23
24 if (!vgic_valid_spi(kvm, spi_id))
25 return -EINVAL;
26 return kvm_vgic_inject_irq(kvm, 0, spi_id, level, NULL);
27 }
28
29 /**
30 * kvm_set_routing_entry: populate a kvm routing entry
31 * from a user routing entry
32 *
33 * @kvm: the VM this entry is applied to
34 * @e: kvm kernel routing entry handle
35 * @ue: user api routing entry handle
36 * return 0 on success, -EINVAL on errors.
37 */
kvm_set_routing_entry(struct kvm * kvm,struct kvm_kernel_irq_routing_entry * e,const struct kvm_irq_routing_entry * ue)38 int kvm_set_routing_entry(struct kvm *kvm,
39 struct kvm_kernel_irq_routing_entry *e,
40 const struct kvm_irq_routing_entry *ue)
41 {
42 int r = -EINVAL;
43
44 switch (ue->type) {
45 case KVM_IRQ_ROUTING_IRQCHIP:
46 e->set = vgic_irqfd_set_irq;
47 e->irqchip.irqchip = ue->u.irqchip.irqchip;
48 e->irqchip.pin = ue->u.irqchip.pin;
49 if ((e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS) ||
50 (e->irqchip.irqchip >= KVM_NR_IRQCHIPS))
51 goto out;
52 break;
53 case KVM_IRQ_ROUTING_MSI:
54 e->set = kvm_set_msi;
55 e->msi.address_lo = ue->u.msi.address_lo;
56 e->msi.address_hi = ue->u.msi.address_hi;
57 e->msi.data = ue->u.msi.data;
58 e->msi.flags = ue->flags;
59 e->msi.devid = ue->u.msi.devid;
60 break;
61 default:
62 goto out;
63 }
64 r = 0;
65 out:
66 return r;
67 }
68
kvm_populate_msi(struct kvm_kernel_irq_routing_entry * e,struct kvm_msi * msi)69 static void kvm_populate_msi(struct kvm_kernel_irq_routing_entry *e,
70 struct kvm_msi *msi)
71 {
72 msi->address_lo = e->msi.address_lo;
73 msi->address_hi = e->msi.address_hi;
74 msi->data = e->msi.data;
75 msi->flags = e->msi.flags;
76 msi->devid = e->msi.devid;
77 }
78 /**
79 * kvm_set_msi: inject the MSI corresponding to the
80 * MSI routing entry
81 *
82 * This is the entry point for irqfd MSI injection
83 * and userspace MSI injection.
84 */
kvm_set_msi(struct kvm_kernel_irq_routing_entry * e,struct kvm * kvm,int irq_source_id,int level,bool line_status)85 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
86 struct kvm *kvm, int irq_source_id,
87 int level, bool line_status)
88 {
89 struct kvm_msi msi;
90
91 if (!vgic_has_its(kvm))
92 return -ENODEV;
93
94 if (!level)
95 return -1;
96
97 kvm_populate_msi(e, &msi);
98 return vgic_its_inject_msi(kvm, &msi);
99 }
100
101 /**
102 * kvm_arch_set_irq_inatomic: fast-path for irqfd injection
103 */
kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry * e,struct kvm * kvm,int irq_source_id,int level,bool line_status)104 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
105 struct kvm *kvm, int irq_source_id, int level,
106 bool line_status)
107 {
108 if (!level)
109 return -EWOULDBLOCK;
110
111 switch (e->type) {
112 case KVM_IRQ_ROUTING_MSI: {
113 struct kvm_msi msi;
114
115 if (!vgic_has_its(kvm))
116 break;
117
118 kvm_populate_msi(e, &msi);
119 return vgic_its_inject_cached_translation(kvm, &msi);
120 }
121
122 case KVM_IRQ_ROUTING_IRQCHIP:
123 /*
124 * Injecting SPIs is always possible in atomic context
125 * as long as the damn vgic is initialized.
126 */
127 if (unlikely(!vgic_initialized(kvm)))
128 break;
129 return vgic_irqfd_set_irq(e, kvm, irq_source_id, 1, line_status);
130 }
131
132 return -EWOULDBLOCK;
133 }
134
kvm_vgic_setup_default_irq_routing(struct kvm * kvm)135 int kvm_vgic_setup_default_irq_routing(struct kvm *kvm)
136 {
137 struct kvm_irq_routing_entry *entries;
138 struct vgic_dist *dist = &kvm->arch.vgic;
139 u32 nr = dist->nr_spis;
140 int i, ret;
141
142 entries = kcalloc(nr, sizeof(*entries), GFP_KERNEL);
143 if (!entries)
144 return -ENOMEM;
145
146 for (i = 0; i < nr; i++) {
147 entries[i].gsi = i;
148 entries[i].type = KVM_IRQ_ROUTING_IRQCHIP;
149 entries[i].u.irqchip.irqchip = 0;
150 entries[i].u.irqchip.pin = i;
151 }
152 ret = kvm_set_irq_routing(kvm, entries, nr, 0);
153 kfree(entries);
154 return ret;
155 }
156
