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1fd4f2a5 ED |
1 | /* |
2 | * Copyright (C) 2001 MandrakeSoft S.A. | |
221d059d | 3 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
1fd4f2a5 ED |
4 | * |
5 | * MandrakeSoft S.A. | |
6 | * 43, rue d'Aboukir | |
7 | * 75002 Paris - France | |
8 | * http://www.linux-mandrake.com/ | |
9 | * http://www.mandrakesoft.com/ | |
10 | * | |
11 | * This library is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU Lesser General Public | |
13 | * License as published by the Free Software Foundation; either | |
14 | * version 2 of the License, or (at your option) any later version. | |
15 | * | |
16 | * This library is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | * Lesser General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU Lesser General Public | |
22 | * License along with this library; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | * | |
25 | * Yunhong Jiang <yunhong.jiang@intel.com> | |
26 | * Yaozu (Eddie) Dong <eddie.dong@intel.com> | |
27 | * Based on Xen 3.1 code. | |
28 | */ | |
29 | ||
edf88417 | 30 | #include <linux/kvm_host.h> |
1fd4f2a5 ED |
31 | #include <linux/kvm.h> |
32 | #include <linux/mm.h> | |
33 | #include <linux/highmem.h> | |
34 | #include <linux/smp.h> | |
35 | #include <linux/hrtimer.h> | |
36 | #include <linux/io.h> | |
5a0e3ad6 | 37 | #include <linux/slab.h> |
1fd4f2a5 | 38 | #include <asm/processor.h> |
1fd4f2a5 ED |
39 | #include <asm/page.h> |
40 | #include <asm/current.h> | |
1000ff8d | 41 | #include <trace/events/kvm.h> |
82470196 ZX |
42 | |
43 | #include "ioapic.h" | |
44 | #include "lapic.h" | |
f5244726 | 45 | #include "irq.h" |
82470196 | 46 | |
e25e3ed5 LV |
47 | #if 0 |
48 | #define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) | |
49 | #else | |
1fd4f2a5 | 50 | #define ioapic_debug(fmt, arg...) |
e25e3ed5 | 51 | #endif |
ff4b9df8 | 52 | static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq); |
1fd4f2a5 ED |
53 | |
54 | static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic, | |
55 | unsigned long addr, | |
56 | unsigned long length) | |
57 | { | |
58 | unsigned long result = 0; | |
59 | ||
60 | switch (ioapic->ioregsel) { | |
61 | case IOAPIC_REG_VERSION: | |
62 | result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16) | |
63 | | (IOAPIC_VERSION_ID & 0xff)); | |
64 | break; | |
65 | ||
66 | case IOAPIC_REG_APIC_ID: | |
67 | case IOAPIC_REG_ARB_ID: | |
68 | result = ((ioapic->id & 0xf) << 24); | |
69 | break; | |
70 | ||
71 | default: | |
72 | { | |
73 | u32 redir_index = (ioapic->ioregsel - 0x10) >> 1; | |
74 | u64 redir_content; | |
75 | ||
76 | ASSERT(redir_index < IOAPIC_NUM_PINS); | |
77 | ||
78 | redir_content = ioapic->redirtbl[redir_index].bits; | |
79 | result = (ioapic->ioregsel & 0x1) ? | |
80 | (redir_content >> 32) & 0xffffffff : | |
81 | redir_content & 0xffffffff; | |
82 | break; | |
83 | } | |
84 | } | |
85 | ||
86 | return result; | |
87 | } | |
88 | ||
4925663a | 89 | static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx) |
1fd4f2a5 | 90 | { |
cf9e4e15 | 91 | union kvm_ioapic_redirect_entry *pent; |
4925663a | 92 | int injected = -1; |
1fd4f2a5 ED |
93 | |
94 | pent = &ioapic->redirtbl[idx]; | |
95 | ||
96 | if (!pent->fields.mask) { | |
4925663a | 97 | injected = ioapic_deliver(ioapic, idx); |
ff4b9df8 | 98 | if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG) |
1fd4f2a5 ED |
99 | pent->fields.remote_irr = 1; |
100 | } | |
4925663a GN |
101 | |
102 | return injected; | |
1fd4f2a5 ED |
103 | } |
104 | ||
46a929bc AK |
105 | static void update_handled_vectors(struct kvm_ioapic *ioapic) |
106 | { | |
107 | DECLARE_BITMAP(handled_vectors, 256); | |
108 | int i; | |
109 | ||
110 | memset(handled_vectors, 0, sizeof(handled_vectors)); | |
111 | for (i = 0; i < IOAPIC_NUM_PINS; ++i) | |
112 | __set_bit(ioapic->redirtbl[i].fields.vector, handled_vectors); | |
113 | memcpy(ioapic->handled_vectors, handled_vectors, | |
114 | sizeof(handled_vectors)); | |
115 | smp_wmb(); | |
116 | } | |
117 | ||
1fd4f2a5 ED |
118 | static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) |
119 | { | |
120 | unsigned index; | |
75858a84 | 121 | bool mask_before, mask_after; |
70f93dae | 122 | union kvm_ioapic_redirect_entry *e; |
1fd4f2a5 ED |
123 | |
124 | switch (ioapic->ioregsel) { | |
125 | case IOAPIC_REG_VERSION: | |
126 | /* Writes are ignored. */ | |
127 | break; | |
128 | ||
129 | case IOAPIC_REG_APIC_ID: | |
130 | ioapic->id = (val >> 24) & 0xf; | |
131 | break; | |
132 | ||
133 | case IOAPIC_REG_ARB_ID: | |
134 | break; | |
135 | ||
136 | default: | |
137 | index = (ioapic->ioregsel - 0x10) >> 1; | |
138 | ||
e25e3ed5 | 139 | ioapic_debug("change redir index %x val %x\n", index, val); |
1fd4f2a5 ED |
140 | if (index >= IOAPIC_NUM_PINS) |
141 | return; | |
70f93dae GN |
142 | e = &ioapic->redirtbl[index]; |
143 | mask_before = e->fields.mask; | |
1fd4f2a5 | 144 | if (ioapic->ioregsel & 1) { |
70f93dae GN |
145 | e->bits &= 0xffffffff; |
146 | e->bits |= (u64) val << 32; | |
1fd4f2a5 | 147 | } else { |
70f93dae GN |
148 | e->bits &= ~0xffffffffULL; |
149 | e->bits |= (u32) val; | |
150 | e->fields.remote_irr = 0; | |
1fd4f2a5 | 151 | } |
46a929bc | 152 | update_handled_vectors(ioapic); |
70f93dae | 153 | mask_after = e->fields.mask; |
75858a84 | 154 | if (mask_before != mask_after) |
4a994358 | 155 | kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after); |
70f93dae | 156 | if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG |
b4a2f5e7 | 157 | && ioapic->irr & (1 << index)) |
1fd4f2a5 ED |
158 | ioapic_service(ioapic, index); |
159 | break; | |
160 | } | |
161 | } | |
162 | ||
a53c17d2 GN |
163 | static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq) |
164 | { | |
58c2dde1 GN |
165 | union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq]; |
166 | struct kvm_lapic_irq irqe; | |
a53c17d2 GN |
167 | |
168 | ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x " | |
169 | "vector=%x trig_mode=%x\n", | |
a38f84ca | 170 | entry->fields.dest_id, entry->fields.dest_mode, |
58c2dde1 GN |
171 | entry->fields.delivery_mode, entry->fields.vector, |
172 | entry->fields.trig_mode); | |
173 | ||
174 | irqe.dest_id = entry->fields.dest_id; | |
175 | irqe.vector = entry->fields.vector; | |
176 | irqe.dest_mode = entry->fields.dest_mode; | |
177 | irqe.trig_mode = entry->fields.trig_mode; | |
178 | irqe.delivery_mode = entry->fields.delivery_mode << 8; | |
179 | irqe.level = 1; | |
180 | irqe.shorthand = 0; | |
a53c17d2 GN |
181 | |
182 | #ifdef CONFIG_X86 | |
183 | /* Always delivery PIT interrupt to vcpu 0 */ | |
184 | if (irq == 0) { | |
58c2dde1 | 185 | irqe.dest_mode = 0; /* Physical mode. */ |
c5af89b6 GN |
186 | /* need to read apic_id from apic regiest since |
187 | * it can be rewritten */ | |
d546cb40 | 188 | irqe.dest_id = ioapic->kvm->bsp_vcpu_id; |
a53c17d2 GN |
189 | } |
190 | #endif | |
58c2dde1 | 191 | return kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe); |
a53c17d2 GN |
192 | } |
193 | ||
1a577b72 MT |
194 | int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id, |
195 | int level) | |
1fd4f2a5 | 196 | { |
07dc7263 | 197 | u32 old_irr; |
1fd4f2a5 | 198 | u32 mask = 1 << irq; |
cf9e4e15 | 199 | union kvm_ioapic_redirect_entry entry; |
28a6fdab MT |
200 | int ret, irq_level; |
201 | ||
202 | BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS); | |
1fd4f2a5 | 203 | |
46a47b1e | 204 | spin_lock(&ioapic->lock); |
07dc7263 | 205 | old_irr = ioapic->irr; |
28a6fdab MT |
206 | irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq], |
207 | irq_source_id, level); | |
208 | entry = ioapic->redirtbl[irq]; | |
209 | irq_level ^= entry.fields.polarity; | |
210 | if (!irq_level) { | |
211 | ioapic->irr &= ~mask; | |
212 | ret = 1; | |
213 | } else { | |
214 | int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG); | |
215 | ioapic->irr |= mask; | |
216 | if ((edge && old_irr != ioapic->irr) || | |
217 | (!edge && !entry.fields.remote_irr)) | |
218 | ret = ioapic_service(ioapic, irq); | |
219 | else | |
220 | ret = 0; /* report coalesced interrupt */ | |
1fd4f2a5 | 221 | } |
28a6fdab | 222 | trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0); |
46a47b1e | 223 | spin_unlock(&ioapic->lock); |
eba0226b | 224 | |
4925663a | 225 | return ret; |
1fd4f2a5 ED |
226 | } |
227 | ||
1a577b72 MT |
228 | void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id) |
229 | { | |
230 | int i; | |
231 | ||
232 | spin_lock(&ioapic->lock); | |
233 | for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) | |
234 | __clear_bit(irq_source_id, &ioapic->irq_states[i]); | |
235 | spin_unlock(&ioapic->lock); | |
236 | } | |
237 | ||
eba0226b GN |
238 | static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int vector, |
239 | int trigger_mode) | |
1fd4f2a5 | 240 | { |
eba0226b GN |
241 | int i; |
242 | ||
243 | for (i = 0; i < IOAPIC_NUM_PINS; i++) { | |
244 | union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i]; | |
1fd4f2a5 | 245 | |
eba0226b GN |
246 | if (ent->fields.vector != vector) |
247 | continue; | |
1fd4f2a5 | 248 | |
eba0226b GN |
249 | /* |
250 | * We are dropping lock while calling ack notifiers because ack | |
251 | * notifier callbacks for assigned devices call into IOAPIC | |
252 | * recursively. Since remote_irr is cleared only after call | |
253 | * to notifiers if the same vector will be delivered while lock | |
254 | * is dropped it will be put into irr and will be delivered | |
255 | * after ack notifier returns. | |
256 | */ | |
46a47b1e | 257 | spin_unlock(&ioapic->lock); |
eba0226b | 258 | kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i); |
46a47b1e | 259 | spin_lock(&ioapic->lock); |
eba0226b GN |
260 | |
261 | if (trigger_mode != IOAPIC_LEVEL_TRIG) | |
262 | continue; | |
f5244726 | 263 | |
f5244726 MT |
264 | ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG); |
265 | ent->fields.remote_irr = 0; | |
eba0226b GN |
266 | if (!ent->fields.mask && (ioapic->irr & (1 << i))) |
267 | ioapic_service(ioapic, i); | |
f5244726 | 268 | } |
1fd4f2a5 ED |
269 | } |
270 | ||
a0c9a822 MT |
271 | bool kvm_ioapic_handles_vector(struct kvm *kvm, int vector) |
272 | { | |
273 | struct kvm_ioapic *ioapic = kvm->arch.vioapic; | |
274 | smp_rmb(); | |
275 | return test_bit(vector, ioapic->handled_vectors); | |
276 | } | |
277 | ||
f5244726 | 278 | void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode) |
4fa6b9c5 AK |
279 | { |
280 | struct kvm_ioapic *ioapic = kvm->arch.vioapic; | |
4fa6b9c5 | 281 | |
46a47b1e | 282 | spin_lock(&ioapic->lock); |
eba0226b | 283 | __kvm_ioapic_update_eoi(ioapic, vector, trigger_mode); |
46a47b1e | 284 | spin_unlock(&ioapic->lock); |
4fa6b9c5 AK |
285 | } |
286 | ||
d76685c4 GH |
287 | static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev) |
288 | { | |
289 | return container_of(dev, struct kvm_ioapic, dev); | |
290 | } | |
291 | ||
bda9020e | 292 | static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr) |
1fd4f2a5 | 293 | { |
1fd4f2a5 ED |
294 | return ((addr >= ioapic->base_address && |
295 | (addr < ioapic->base_address + IOAPIC_MEM_LENGTH))); | |
296 | } | |
297 | ||
bda9020e MT |
298 | static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len, |
299 | void *val) | |
1fd4f2a5 | 300 | { |
d76685c4 | 301 | struct kvm_ioapic *ioapic = to_ioapic(this); |
1fd4f2a5 | 302 | u32 result; |
bda9020e MT |
303 | if (!ioapic_in_range(ioapic, addr)) |
304 | return -EOPNOTSUPP; | |
1fd4f2a5 | 305 | |
e25e3ed5 | 306 | ioapic_debug("addr %lx\n", (unsigned long)addr); |
1fd4f2a5 ED |
307 | ASSERT(!(addr & 0xf)); /* check alignment */ |
308 | ||
309 | addr &= 0xff; | |
46a47b1e | 310 | spin_lock(&ioapic->lock); |
1fd4f2a5 ED |
311 | switch (addr) { |
312 | case IOAPIC_REG_SELECT: | |
313 | result = ioapic->ioregsel; | |
314 | break; | |
315 | ||
316 | case IOAPIC_REG_WINDOW: | |
317 | result = ioapic_read_indirect(ioapic, addr, len); | |
318 | break; | |
319 | ||
320 | default: | |
321 | result = 0; | |
322 | break; | |
323 | } | |
46a47b1e | 324 | spin_unlock(&ioapic->lock); |
eba0226b | 325 | |
1fd4f2a5 ED |
326 | switch (len) { |
327 | case 8: | |
328 | *(u64 *) val = result; | |
329 | break; | |
330 | case 1: | |
331 | case 2: | |
332 | case 4: | |
333 | memcpy(val, (char *)&result, len); | |
334 | break; | |
335 | default: | |
336 | printk(KERN_WARNING "ioapic: wrong length %d\n", len); | |
337 | } | |
bda9020e | 338 | return 0; |
1fd4f2a5 ED |
339 | } |
340 | ||
bda9020e MT |
341 | static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len, |
342 | const void *val) | |
1fd4f2a5 | 343 | { |
d76685c4 | 344 | struct kvm_ioapic *ioapic = to_ioapic(this); |
1fd4f2a5 | 345 | u32 data; |
bda9020e MT |
346 | if (!ioapic_in_range(ioapic, addr)) |
347 | return -EOPNOTSUPP; | |
1fd4f2a5 | 348 | |
e25e3ed5 LV |
349 | ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n", |
350 | (void*)addr, len, val); | |
1fd4f2a5 | 351 | ASSERT(!(addr & 0xf)); /* check alignment */ |
60eead79 | 352 | |
d77fe635 JS |
353 | switch (len) { |
354 | case 8: | |
355 | case 4: | |
1fd4f2a5 | 356 | data = *(u32 *) val; |
d77fe635 JS |
357 | break; |
358 | case 2: | |
359 | data = *(u16 *) val; | |
360 | break; | |
361 | case 1: | |
362 | data = *(u8 *) val; | |
363 | break; | |
364 | default: | |
1fd4f2a5 | 365 | printk(KERN_WARNING "ioapic: Unsupported size %d\n", len); |
eba0226b | 366 | return 0; |
1fd4f2a5 ED |
367 | } |
368 | ||
369 | addr &= 0xff; | |
46a47b1e | 370 | spin_lock(&ioapic->lock); |
1fd4f2a5 ED |
371 | switch (addr) { |
372 | case IOAPIC_REG_SELECT: | |
d77fe635 | 373 | ioapic->ioregsel = data & 0xFF; /* 8-bit register */ |
1fd4f2a5 ED |
374 | break; |
375 | ||
376 | case IOAPIC_REG_WINDOW: | |
377 | ioapic_write_indirect(ioapic, data); | |
378 | break; | |
b1fd3d30 ZX |
379 | #ifdef CONFIG_IA64 |
380 | case IOAPIC_REG_EOI: | |
eba0226b | 381 | __kvm_ioapic_update_eoi(ioapic, data, IOAPIC_LEVEL_TRIG); |
b1fd3d30 ZX |
382 | break; |
383 | #endif | |
1fd4f2a5 ED |
384 | |
385 | default: | |
386 | break; | |
387 | } | |
46a47b1e | 388 | spin_unlock(&ioapic->lock); |
bda9020e | 389 | return 0; |
1fd4f2a5 ED |
390 | } |
391 | ||
8c392696 ED |
392 | void kvm_ioapic_reset(struct kvm_ioapic *ioapic) |
393 | { | |
394 | int i; | |
395 | ||
396 | for (i = 0; i < IOAPIC_NUM_PINS; i++) | |
397 | ioapic->redirtbl[i].fields.mask = 1; | |
398 | ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS; | |
399 | ioapic->ioregsel = 0; | |
400 | ioapic->irr = 0; | |
401 | ioapic->id = 0; | |
46a929bc | 402 | update_handled_vectors(ioapic); |
8c392696 ED |
403 | } |
404 | ||
d76685c4 GH |
405 | static const struct kvm_io_device_ops ioapic_mmio_ops = { |
406 | .read = ioapic_mmio_read, | |
407 | .write = ioapic_mmio_write, | |
d76685c4 GH |
408 | }; |
409 | ||
1fd4f2a5 ED |
410 | int kvm_ioapic_init(struct kvm *kvm) |
411 | { | |
412 | struct kvm_ioapic *ioapic; | |
090b7aff | 413 | int ret; |
1fd4f2a5 ED |
414 | |
415 | ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL); | |
416 | if (!ioapic) | |
417 | return -ENOMEM; | |
46a47b1e | 418 | spin_lock_init(&ioapic->lock); |
d7deeeb0 | 419 | kvm->arch.vioapic = ioapic; |
8c392696 | 420 | kvm_ioapic_reset(ioapic); |
d76685c4 | 421 | kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops); |
1fd4f2a5 | 422 | ioapic->kvm = kvm; |
79fac95e | 423 | mutex_lock(&kvm->slots_lock); |
743eeb0b SL |
424 | ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, ioapic->base_address, |
425 | IOAPIC_MEM_LENGTH, &ioapic->dev); | |
79fac95e | 426 | mutex_unlock(&kvm->slots_lock); |
1ae77bad WY |
427 | if (ret < 0) { |
428 | kvm->arch.vioapic = NULL; | |
090b7aff | 429 | kfree(ioapic); |
1ae77bad | 430 | } |
090b7aff GH |
431 | |
432 | return ret; | |
1fd4f2a5 | 433 | } |
75858a84 | 434 | |
72bb2fcd WY |
435 | void kvm_ioapic_destroy(struct kvm *kvm) |
436 | { | |
437 | struct kvm_ioapic *ioapic = kvm->arch.vioapic; | |
438 | ||
439 | if (ioapic) { | |
440 | kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev); | |
441 | kvm->arch.vioapic = NULL; | |
442 | kfree(ioapic); | |
443 | } | |
444 | } | |
445 | ||
eba0226b GN |
446 | int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) |
447 | { | |
448 | struct kvm_ioapic *ioapic = ioapic_irqchip(kvm); | |
449 | if (!ioapic) | |
450 | return -EINVAL; | |
451 | ||
46a47b1e | 452 | spin_lock(&ioapic->lock); |
eba0226b | 453 | memcpy(state, ioapic, sizeof(struct kvm_ioapic_state)); |
46a47b1e | 454 | spin_unlock(&ioapic->lock); |
eba0226b GN |
455 | return 0; |
456 | } | |
457 | ||
458 | int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) | |
459 | { | |
460 | struct kvm_ioapic *ioapic = ioapic_irqchip(kvm); | |
461 | if (!ioapic) | |
462 | return -EINVAL; | |
463 | ||
46a47b1e | 464 | spin_lock(&ioapic->lock); |
eba0226b | 465 | memcpy(ioapic, state, sizeof(struct kvm_ioapic_state)); |
46a929bc | 466 | update_handled_vectors(ioapic); |
46a47b1e | 467 | spin_unlock(&ioapic->lock); |
eba0226b GN |
468 | return 0; |
469 | } |