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23#include <linux/kvm_host.h>
24#include <linux/slab.h>
25#include <linux/export.h>
26#include <trace/events/kvm.h>
27
28#include <asm/msidef.h>
29
30#include "irq.h"
31
32#include "ioapic.h"
33
34static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
35 struct kvm *kvm, int irq_source_id, int level,
36 bool line_status)
37{
38 struct kvm_pic *pic = pic_irqchip(kvm);
39 return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level);
40}
41
42static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
43 struct kvm *kvm, int irq_source_id, int level,
44 bool line_status)
45{
46 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
47 return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level,
48 line_status);
49}
50
51inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
52{
53 return irq->delivery_mode == APIC_DM_LOWEST;
54}
55
56int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
57 struct kvm_lapic_irq *irq, unsigned long *dest_map)
58{
59 int i, r = -1;
60 struct kvm_vcpu *vcpu, *lowest = NULL;
61
62 if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
63 kvm_is_dm_lowest_prio(irq)) {
64 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
65 irq->delivery_mode = APIC_DM_FIXED;
66 }
67
68 if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map))
69 return r;
70
71 kvm_for_each_vcpu(i, vcpu, kvm) {
72 if (!kvm_apic_present(vcpu))
73 continue;
74
75 if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
76 irq->dest_id, irq->dest_mode))
77 continue;
78
79 if (!kvm_is_dm_lowest_prio(irq)) {
80 if (r < 0)
81 r = 0;
82 r += kvm_apic_set_irq(vcpu, irq, dest_map);
83 } else if (kvm_lapic_enabled(vcpu)) {
84 if (!lowest)
85 lowest = vcpu;
86 else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
87 lowest = vcpu;
88 }
89 }
90
91 if (lowest)
92 r = kvm_apic_set_irq(lowest, irq, dest_map);
93
94 return r;
95}
96
97static inline void kvm_set_msi_irq(struct kvm_kernel_irq_routing_entry *e,
98 struct kvm_lapic_irq *irq)
99{
100 trace_kvm_msi_set_irq(e->msi.address_lo, e->msi.data);
101
102 irq->dest_id = (e->msi.address_lo &
103 MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
104 irq->vector = (e->msi.data &
105 MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
106 irq->dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
107 irq->trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
108 irq->delivery_mode = e->msi.data & 0x700;
109 irq->level = 1;
110 irq->shorthand = 0;
111
112}
113
114int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
115 struct kvm *kvm, int irq_source_id, int level, bool line_status)
116{
117 struct kvm_lapic_irq irq;
118
119 if (!level)
120 return -1;
121
122 kvm_set_msi_irq(e, &irq);
123
124 return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL);
125}
126
127
128static int kvm_set_msi_inatomic(struct kvm_kernel_irq_routing_entry *e,
129 struct kvm *kvm)
130{
131 struct kvm_lapic_irq irq;
132 int r;
133
134 kvm_set_msi_irq(e, &irq);
135
136 if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r, NULL))
137 return r;
138 else
139 return -EWOULDBLOCK;
140}
141
142
143
144
145
146
147
148
149int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level)
150{
151 struct kvm_kernel_irq_routing_entry entries[KVM_NR_IRQCHIPS];
152 struct kvm_kernel_irq_routing_entry *e;
153 int ret = -EINVAL;
154 int idx;
155
156 trace_kvm_set_irq(irq, level, irq_source_id);
157
158
159
160
161
162
163
164
165
166 idx = srcu_read_lock(&kvm->irq_srcu);
167 if (kvm_irq_map_gsi(kvm, entries, irq) > 0) {
168 e = &entries[0];
169 if (likely(e->type == KVM_IRQ_ROUTING_MSI))
170 ret = kvm_set_msi_inatomic(e, kvm);
171 else
172 ret = -EWOULDBLOCK;
173 }
174 srcu_read_unlock(&kvm->irq_srcu, idx);
175 return ret;
176}
177
178int kvm_request_irq_source_id(struct kvm *kvm)
179{
180 unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
181 int irq_source_id;
182
183 mutex_lock(&kvm->irq_lock);
184 irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG);
185
186 if (irq_source_id >= BITS_PER_LONG) {
187 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
188 irq_source_id = -EFAULT;
189 goto unlock;
190 }
191
192 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
193 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
194 set_bit(irq_source_id, bitmap);
195unlock:
196 mutex_unlock(&kvm->irq_lock);
197
198 return irq_source_id;
199}
200
201void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
202{
203 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
204 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
205
206 mutex_lock(&kvm->irq_lock);
207 if (irq_source_id < 0 ||
208 irq_source_id >= BITS_PER_LONG) {
209 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
210 goto unlock;
211 }
212 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
213 if (!irqchip_in_kernel(kvm))
214 goto unlock;
215
216 kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id);
217 kvm_pic_clear_all(pic_irqchip(kvm), irq_source_id);
218unlock:
219 mutex_unlock(&kvm->irq_lock);
220}
221
222void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
223 struct kvm_irq_mask_notifier *kimn)
224{
225 mutex_lock(&kvm->irq_lock);
226 kimn->irq = irq;
227 hlist_add_head_rcu(&kimn->link, &kvm->arch.mask_notifier_list);
228 mutex_unlock(&kvm->irq_lock);
229}
230
231void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
232 struct kvm_irq_mask_notifier *kimn)
233{
234 mutex_lock(&kvm->irq_lock);
235 hlist_del_rcu(&kimn->link);
236 mutex_unlock(&kvm->irq_lock);
237 synchronize_srcu(&kvm->irq_srcu);
238}
239
240void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
241 bool mask)
242{
243 struct kvm_irq_mask_notifier *kimn;
244 int idx, gsi;
245
246 idx = srcu_read_lock(&kvm->irq_srcu);
247 gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin);
248 if (gsi != -1)
249 hlist_for_each_entry_rcu(kimn, &kvm->arch.mask_notifier_list, link)
250 if (kimn->irq == gsi)
251 kimn->func(kimn, mask);
252 srcu_read_unlock(&kvm->irq_srcu, idx);
253}
254
255int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
256 const struct kvm_irq_routing_entry *ue)
257{
258 int r = -EINVAL;
259 int delta;
260 unsigned max_pin;
261
262 switch (ue->type) {
263 case KVM_IRQ_ROUTING_IRQCHIP:
264 delta = 0;
265 switch (ue->u.irqchip.irqchip) {
266 case KVM_IRQCHIP_PIC_MASTER:
267 e->set = kvm_set_pic_irq;
268 max_pin = PIC_NUM_PINS;
269 break;
270 case KVM_IRQCHIP_PIC_SLAVE:
271 e->set = kvm_set_pic_irq;
272 max_pin = PIC_NUM_PINS;
273 delta = 8;
274 break;
275 case KVM_IRQCHIP_IOAPIC:
276 max_pin = KVM_IOAPIC_NUM_PINS;
277 e->set = kvm_set_ioapic_irq;
278 break;
279 default:
280 goto out;
281 }
282 e->irqchip.irqchip = ue->u.irqchip.irqchip;
283 e->irqchip.pin = ue->u.irqchip.pin + delta;
284 if (e->irqchip.pin >= max_pin)
285 goto out;
286 break;
287 case KVM_IRQ_ROUTING_MSI:
288 e->set = kvm_set_msi;
289 e->msi.address_lo = ue->u.msi.address_lo;
290 e->msi.address_hi = ue->u.msi.address_hi;
291 e->msi.data = ue->u.msi.data;
292 break;
293 default:
294 goto out;
295 }
296
297 r = 0;
298out:
299 return r;
300}
301
302#define IOAPIC_ROUTING_ENTRY(irq) \
303 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
304 .u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } }
305#define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
306
307#define PIC_ROUTING_ENTRY(irq) \
308 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
309 .u.irqchip = { .irqchip = SELECT_PIC(irq), .pin = (irq) % 8 } }
310#define ROUTING_ENTRY2(irq) \
311 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
312
313static const struct kvm_irq_routing_entry default_routing[] = {
314 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
315 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
316 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
317 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
318 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
319 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
320 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
321 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
322 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
323 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
324 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
325 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
326};
327
328int kvm_setup_default_irq_routing(struct kvm *kvm)
329{
330 return kvm_set_irq_routing(kvm, default_routing,
331 ARRAY_SIZE(default_routing), 0);
332}
333
