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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> |
c7c9c56c | 38 | #include <linux/export.h> |
1fd4f2a5 | 39 | #include <asm/processor.h> |
1fd4f2a5 ED |
40 | #include <asm/page.h> |
41 | #include <asm/current.h> | |
1000ff8d | 42 | #include <trace/events/kvm.h> |
82470196 ZX |
43 | |
44 | #include "ioapic.h" | |
45 | #include "lapic.h" | |
f5244726 | 46 | #include "irq.h" |
82470196 | 47 | |
e25e3ed5 LV |
48 | #if 0 |
49 | #define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) | |
50 | #else | |
1fd4f2a5 | 51 | #define ioapic_debug(fmt, arg...) |
e25e3ed5 | 52 | #endif |
0b10a1c8 | 53 | static int ioapic_service(struct kvm_ioapic *vioapic, int irq, |
aa2fbe6d | 54 | bool line_status); |
1fd4f2a5 ED |
55 | |
56 | static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic, | |
57 | unsigned long addr, | |
58 | unsigned long length) | |
59 | { | |
60 | unsigned long result = 0; | |
61 | ||
62 | switch (ioapic->ioregsel) { | |
63 | case IOAPIC_REG_VERSION: | |
64 | result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16) | |
65 | | (IOAPIC_VERSION_ID & 0xff)); | |
66 | break; | |
67 | ||
68 | case IOAPIC_REG_APIC_ID: | |
69 | case IOAPIC_REG_ARB_ID: | |
70 | result = ((ioapic->id & 0xf) << 24); | |
71 | break; | |
72 | ||
73 | default: | |
74 | { | |
75 | u32 redir_index = (ioapic->ioregsel - 0x10) >> 1; | |
76 | u64 redir_content; | |
77 | ||
a2c118bf AH |
78 | if (redir_index < IOAPIC_NUM_PINS) |
79 | redir_content = | |
80 | ioapic->redirtbl[redir_index].bits; | |
81 | else | |
82 | redir_content = ~0ULL; | |
1fd4f2a5 | 83 | |
1fd4f2a5 ED |
84 | result = (ioapic->ioregsel & 0x1) ? |
85 | (redir_content >> 32) & 0xffffffff : | |
86 | redir_content & 0xffffffff; | |
87 | break; | |
88 | } | |
89 | } | |
90 | ||
91 | return result; | |
92 | } | |
93 | ||
10606919 YZ |
94 | static void rtc_irq_eoi_tracking_reset(struct kvm_ioapic *ioapic) |
95 | { | |
96 | ioapic->rtc_status.pending_eoi = 0; | |
97 | bitmap_zero(ioapic->rtc_status.dest_map, KVM_MAX_VCPUS); | |
98 | } | |
99 | ||
4009b249 PB |
100 | static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic); |
101 | ||
102 | static void rtc_status_pending_eoi_check_valid(struct kvm_ioapic *ioapic) | |
103 | { | |
104 | if (WARN_ON(ioapic->rtc_status.pending_eoi < 0)) | |
105 | kvm_rtc_eoi_tracking_restore_all(ioapic); | |
106 | } | |
107 | ||
10606919 YZ |
108 | static void __rtc_irq_eoi_tracking_restore_one(struct kvm_vcpu *vcpu) |
109 | { | |
110 | bool new_val, old_val; | |
111 | struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; | |
112 | union kvm_ioapic_redirect_entry *e; | |
113 | ||
114 | e = &ioapic->redirtbl[RTC_GSI]; | |
115 | if (!kvm_apic_match_dest(vcpu, NULL, 0, e->fields.dest_id, | |
116 | e->fields.dest_mode)) | |
117 | return; | |
118 | ||
119 | new_val = kvm_apic_pending_eoi(vcpu, e->fields.vector); | |
120 | old_val = test_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map); | |
121 | ||
122 | if (new_val == old_val) | |
123 | return; | |
124 | ||
125 | if (new_val) { | |
126 | __set_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map); | |
127 | ioapic->rtc_status.pending_eoi++; | |
128 | } else { | |
129 | __clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map); | |
130 | ioapic->rtc_status.pending_eoi--; | |
4009b249 | 131 | rtc_status_pending_eoi_check_valid(ioapic); |
10606919 | 132 | } |
10606919 YZ |
133 | } |
134 | ||
135 | void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu) | |
136 | { | |
137 | struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; | |
138 | ||
139 | spin_lock(&ioapic->lock); | |
140 | __rtc_irq_eoi_tracking_restore_one(vcpu); | |
141 | spin_unlock(&ioapic->lock); | |
142 | } | |
143 | ||
144 | static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic) | |
145 | { | |
146 | struct kvm_vcpu *vcpu; | |
147 | int i; | |
148 | ||
149 | if (RTC_GSI >= IOAPIC_NUM_PINS) | |
150 | return; | |
151 | ||
152 | rtc_irq_eoi_tracking_reset(ioapic); | |
153 | kvm_for_each_vcpu(i, vcpu, ioapic->kvm) | |
154 | __rtc_irq_eoi_tracking_restore_one(vcpu); | |
155 | } | |
156 | ||
2c2bf011 YZ |
157 | static void rtc_irq_eoi(struct kvm_ioapic *ioapic, struct kvm_vcpu *vcpu) |
158 | { | |
4009b249 | 159 | if (test_and_clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map)) { |
2c2bf011 | 160 | --ioapic->rtc_status.pending_eoi; |
4009b249 PB |
161 | rtc_status_pending_eoi_check_valid(ioapic); |
162 | } | |
2c2bf011 YZ |
163 | } |
164 | ||
165 | static bool rtc_irq_check_coalesced(struct kvm_ioapic *ioapic) | |
166 | { | |
167 | if (ioapic->rtc_status.pending_eoi > 0) | |
168 | return true; /* coalesced */ | |
169 | ||
170 | return false; | |
171 | } | |
172 | ||
44847dea PB |
173 | static int ioapic_set_irq(struct kvm_ioapic *ioapic, unsigned int irq, |
174 | int irq_level, bool line_status) | |
175 | { | |
176 | union kvm_ioapic_redirect_entry entry; | |
177 | u32 mask = 1 << irq; | |
178 | u32 old_irr; | |
179 | int edge, ret; | |
180 | ||
181 | entry = ioapic->redirtbl[irq]; | |
182 | edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG); | |
183 | ||
184 | if (!irq_level) { | |
185 | ioapic->irr &= ~mask; | |
186 | ret = 1; | |
187 | goto out; | |
188 | } | |
189 | ||
190 | /* | |
191 | * Return 0 for coalesced interrupts; for edge-triggered interrupts, | |
192 | * this only happens if a previous edge has not been delivered due | |
193 | * do masking. For level interrupts, the remote_irr field tells | |
194 | * us if the interrupt is waiting for an EOI. | |
195 | * | |
196 | * RTC is special: it is edge-triggered, but userspace likes to know | |
197 | * if it has been already ack-ed via EOI because coalesced RTC | |
198 | * interrupts lead to time drift in Windows guests. So we track | |
199 | * EOI manually for the RTC interrupt. | |
200 | */ | |
201 | if (irq == RTC_GSI && line_status && | |
202 | rtc_irq_check_coalesced(ioapic)) { | |
203 | ret = 0; | |
204 | goto out; | |
205 | } | |
206 | ||
207 | old_irr = ioapic->irr; | |
208 | ioapic->irr |= mask; | |
5bda6eed WV |
209 | if (edge) |
210 | ioapic->irr_delivered &= ~mask; | |
44847dea PB |
211 | if ((edge && old_irr == ioapic->irr) || |
212 | (!edge && entry.fields.remote_irr)) { | |
213 | ret = 0; | |
214 | goto out; | |
215 | } | |
216 | ||
217 | ret = ioapic_service(ioapic, irq, line_status); | |
218 | ||
219 | out: | |
220 | trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0); | |
221 | return ret; | |
222 | } | |
223 | ||
673f7b42 PB |
224 | static void kvm_ioapic_inject_all(struct kvm_ioapic *ioapic, unsigned long irr) |
225 | { | |
226 | u32 idx; | |
227 | ||
228 | rtc_irq_eoi_tracking_reset(ioapic); | |
229 | for_each_set_bit(idx, &irr, IOAPIC_NUM_PINS) | |
230 | ioapic_set_irq(ioapic, idx, 1, true); | |
231 | ||
232 | kvm_rtc_eoi_tracking_restore_all(ioapic); | |
233 | } | |
234 | ||
235 | ||
46a929bc AK |
236 | static void update_handled_vectors(struct kvm_ioapic *ioapic) |
237 | { | |
238 | DECLARE_BITMAP(handled_vectors, 256); | |
239 | int i; | |
240 | ||
241 | memset(handled_vectors, 0, sizeof(handled_vectors)); | |
242 | for (i = 0; i < IOAPIC_NUM_PINS; ++i) | |
243 | __set_bit(ioapic->redirtbl[i].fields.vector, handled_vectors); | |
244 | memcpy(ioapic->handled_vectors, handled_vectors, | |
245 | sizeof(handled_vectors)); | |
246 | smp_wmb(); | |
247 | } | |
248 | ||
cf9e65b7 YZ |
249 | void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap, |
250 | u32 *tmr) | |
c7c9c56c YZ |
251 | { |
252 | struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; | |
253 | union kvm_ioapic_redirect_entry *e; | |
c7c9c56c YZ |
254 | int index; |
255 | ||
256 | spin_lock(&ioapic->lock); | |
c7c9c56c YZ |
257 | for (index = 0; index < IOAPIC_NUM_PINS; index++) { |
258 | e = &ioapic->redirtbl[index]; | |
0f6c0a74 PB |
259 | if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG || |
260 | kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index) || | |
261 | index == RTC_GSI) { | |
44944d4d | 262 | if (kvm_apic_match_dest(vcpu, NULL, 0, |
cf9e65b7 YZ |
263 | e->fields.dest_id, e->fields.dest_mode)) { |
264 | __set_bit(e->fields.vector, | |
265 | (unsigned long *)eoi_exit_bitmap); | |
266 | if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG) | |
267 | __set_bit(e->fields.vector, | |
268 | (unsigned long *)tmr); | |
269 | } | |
c7c9c56c YZ |
270 | } |
271 | } | |
272 | spin_unlock(&ioapic->lock); | |
273 | } | |
c7c9c56c | 274 | |
3d81bc7e | 275 | void kvm_vcpu_request_scan_ioapic(struct kvm *kvm) |
c7c9c56c YZ |
276 | { |
277 | struct kvm_ioapic *ioapic = kvm->arch.vioapic; | |
278 | ||
3d81bc7e | 279 | if (!ioapic) |
c7c9c56c | 280 | return; |
3d81bc7e | 281 | kvm_make_scan_ioapic_request(kvm); |
c7c9c56c YZ |
282 | } |
283 | ||
1fd4f2a5 ED |
284 | static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) |
285 | { | |
286 | unsigned index; | |
75858a84 | 287 | bool mask_before, mask_after; |
70f93dae | 288 | union kvm_ioapic_redirect_entry *e; |
1fd4f2a5 ED |
289 | |
290 | switch (ioapic->ioregsel) { | |
291 | case IOAPIC_REG_VERSION: | |
292 | /* Writes are ignored. */ | |
293 | break; | |
294 | ||
295 | case IOAPIC_REG_APIC_ID: | |
296 | ioapic->id = (val >> 24) & 0xf; | |
297 | break; | |
298 | ||
299 | case IOAPIC_REG_ARB_ID: | |
300 | break; | |
301 | ||
302 | default: | |
303 | index = (ioapic->ioregsel - 0x10) >> 1; | |
304 | ||
e25e3ed5 | 305 | ioapic_debug("change redir index %x val %x\n", index, val); |
1fd4f2a5 ED |
306 | if (index >= IOAPIC_NUM_PINS) |
307 | return; | |
70f93dae GN |
308 | e = &ioapic->redirtbl[index]; |
309 | mask_before = e->fields.mask; | |
1fd4f2a5 | 310 | if (ioapic->ioregsel & 1) { |
70f93dae GN |
311 | e->bits &= 0xffffffff; |
312 | e->bits |= (u64) val << 32; | |
1fd4f2a5 | 313 | } else { |
70f93dae GN |
314 | e->bits &= ~0xffffffffULL; |
315 | e->bits |= (u32) val; | |
316 | e->fields.remote_irr = 0; | |
1fd4f2a5 | 317 | } |
46a929bc | 318 | update_handled_vectors(ioapic); |
70f93dae | 319 | mask_after = e->fields.mask; |
75858a84 | 320 | if (mask_before != mask_after) |
4a994358 | 321 | kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after); |
70f93dae | 322 | if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG |
b4a2f5e7 | 323 | && ioapic->irr & (1 << index)) |
aa2fbe6d | 324 | ioapic_service(ioapic, index, false); |
3d81bc7e | 325 | kvm_vcpu_request_scan_ioapic(ioapic->kvm); |
1fd4f2a5 ED |
326 | break; |
327 | } | |
328 | } | |
329 | ||
0b10a1c8 | 330 | static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status) |
a53c17d2 | 331 | { |
58c2dde1 GN |
332 | union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq]; |
333 | struct kvm_lapic_irq irqe; | |
2c2bf011 | 334 | int ret; |
a53c17d2 | 335 | |
0b10a1c8 PB |
336 | if (entry->fields.mask) |
337 | return -1; | |
338 | ||
a53c17d2 GN |
339 | ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x " |
340 | "vector=%x trig_mode=%x\n", | |
a38f84ca | 341 | entry->fields.dest_id, entry->fields.dest_mode, |
58c2dde1 GN |
342 | entry->fields.delivery_mode, entry->fields.vector, |
343 | entry->fields.trig_mode); | |
344 | ||
345 | irqe.dest_id = entry->fields.dest_id; | |
346 | irqe.vector = entry->fields.vector; | |
347 | irqe.dest_mode = entry->fields.dest_mode; | |
348 | irqe.trig_mode = entry->fields.trig_mode; | |
349 | irqe.delivery_mode = entry->fields.delivery_mode << 8; | |
350 | irqe.level = 1; | |
351 | irqe.shorthand = 0; | |
a53c17d2 | 352 | |
0bc830b0 | 353 | if (irqe.trig_mode == IOAPIC_EDGE_TRIG) |
5bda6eed | 354 | ioapic->irr_delivered |= 1 << irq; |
0bc830b0 | 355 | |
2c2bf011 | 356 | if (irq == RTC_GSI && line_status) { |
4009b249 PB |
357 | /* |
358 | * pending_eoi cannot ever become negative (see | |
359 | * rtc_status_pending_eoi_check_valid) and the caller | |
360 | * ensures that it is only called if it is >= zero, namely | |
361 | * if rtc_irq_check_coalesced returns false). | |
362 | */ | |
2c2bf011 YZ |
363 | BUG_ON(ioapic->rtc_status.pending_eoi != 0); |
364 | ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, | |
365 | ioapic->rtc_status.dest_map); | |
5678de3f | 366 | ioapic->rtc_status.pending_eoi = (ret < 0 ? 0 : ret); |
2c2bf011 YZ |
367 | } else |
368 | ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL); | |
369 | ||
0b10a1c8 PB |
370 | if (ret && irqe.trig_mode == IOAPIC_LEVEL_TRIG) |
371 | entry->fields.remote_irr = 1; | |
372 | ||
2c2bf011 | 373 | return ret; |
a53c17d2 GN |
374 | } |
375 | ||
1a577b72 | 376 | int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id, |
aa2fbe6d | 377 | int level, bool line_status) |
1fd4f2a5 | 378 | { |
28a6fdab MT |
379 | int ret, irq_level; |
380 | ||
381 | BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS); | |
1fd4f2a5 | 382 | |
46a47b1e | 383 | spin_lock(&ioapic->lock); |
28a6fdab MT |
384 | irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq], |
385 | irq_source_id, level); | |
44847dea | 386 | ret = ioapic_set_irq(ioapic, irq, irq_level, line_status); |
2c2bf011 | 387 | |
46a47b1e | 388 | spin_unlock(&ioapic->lock); |
eba0226b | 389 | |
4925663a | 390 | return ret; |
1fd4f2a5 ED |
391 | } |
392 | ||
1a577b72 MT |
393 | void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id) |
394 | { | |
395 | int i; | |
396 | ||
397 | spin_lock(&ioapic->lock); | |
398 | for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) | |
399 | __clear_bit(irq_source_id, &ioapic->irq_states[i]); | |
400 | spin_unlock(&ioapic->lock); | |
401 | } | |
402 | ||
184564ef ZH |
403 | static void kvm_ioapic_eoi_inject_work(struct work_struct *work) |
404 | { | |
405 | int i; | |
406 | struct kvm_ioapic *ioapic = container_of(work, struct kvm_ioapic, | |
407 | eoi_inject.work); | |
408 | spin_lock(&ioapic->lock); | |
409 | for (i = 0; i < IOAPIC_NUM_PINS; i++) { | |
410 | union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i]; | |
411 | ||
412 | if (ent->fields.trig_mode != IOAPIC_LEVEL_TRIG) | |
413 | continue; | |
414 | ||
415 | if (ioapic->irr & (1 << i) && !ent->fields.remote_irr) | |
416 | ioapic_service(ioapic, i, false); | |
417 | } | |
418 | spin_unlock(&ioapic->lock); | |
419 | } | |
420 | ||
421 | #define IOAPIC_SUCCESSIVE_IRQ_MAX_COUNT 10000 | |
422 | ||
1fcc7890 YZ |
423 | static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, |
424 | struct kvm_ioapic *ioapic, int vector, int trigger_mode) | |
1fd4f2a5 | 425 | { |
eba0226b | 426 | int i; |
c806a6ad | 427 | struct kvm_lapic *apic = vcpu->arch.apic; |
eba0226b GN |
428 | |
429 | for (i = 0; i < IOAPIC_NUM_PINS; i++) { | |
430 | union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i]; | |
1fd4f2a5 | 431 | |
eba0226b GN |
432 | if (ent->fields.vector != vector) |
433 | continue; | |
1fd4f2a5 | 434 | |
2c2bf011 YZ |
435 | if (i == RTC_GSI) |
436 | rtc_irq_eoi(ioapic, vcpu); | |
eba0226b GN |
437 | /* |
438 | * We are dropping lock while calling ack notifiers because ack | |
439 | * notifier callbacks for assigned devices call into IOAPIC | |
440 | * recursively. Since remote_irr is cleared only after call | |
441 | * to notifiers if the same vector will be delivered while lock | |
442 | * is dropped it will be put into irr and will be delivered | |
443 | * after ack notifier returns. | |
444 | */ | |
46a47b1e | 445 | spin_unlock(&ioapic->lock); |
eba0226b | 446 | kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i); |
46a47b1e | 447 | spin_lock(&ioapic->lock); |
eba0226b | 448 | |
c806a6ad RK |
449 | if (trigger_mode != IOAPIC_LEVEL_TRIG || |
450 | kvm_apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI) | |
eba0226b | 451 | continue; |
f5244726 | 452 | |
f5244726 MT |
453 | ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG); |
454 | ent->fields.remote_irr = 0; | |
184564ef ZH |
455 | if (!ent->fields.mask && (ioapic->irr & (1 << i))) { |
456 | ++ioapic->irq_eoi[i]; | |
457 | if (ioapic->irq_eoi[i] == IOAPIC_SUCCESSIVE_IRQ_MAX_COUNT) { | |
458 | /* | |
459 | * Real hardware does not deliver the interrupt | |
460 | * immediately during eoi broadcast, and this | |
461 | * lets a buggy guest make slow progress | |
462 | * even if it does not correctly handle a | |
463 | * level-triggered interrupt. Emulate this | |
464 | * behavior if we detect an interrupt storm. | |
465 | */ | |
466 | schedule_delayed_work(&ioapic->eoi_inject, HZ / 100); | |
467 | ioapic->irq_eoi[i] = 0; | |
468 | trace_kvm_ioapic_delayed_eoi_inj(ent->bits); | |
469 | } else { | |
470 | ioapic_service(ioapic, i, false); | |
471 | } | |
472 | } else { | |
473 | ioapic->irq_eoi[i] = 0; | |
474 | } | |
f5244726 | 475 | } |
1fd4f2a5 ED |
476 | } |
477 | ||
1fcc7890 | 478 | void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector, int trigger_mode) |
4fa6b9c5 | 479 | { |
1fcc7890 | 480 | struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; |
4fa6b9c5 | 481 | |
46a47b1e | 482 | spin_lock(&ioapic->lock); |
1fcc7890 | 483 | __kvm_ioapic_update_eoi(vcpu, ioapic, vector, trigger_mode); |
46a47b1e | 484 | spin_unlock(&ioapic->lock); |
4fa6b9c5 AK |
485 | } |
486 | ||
d76685c4 GH |
487 | static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev) |
488 | { | |
489 | return container_of(dev, struct kvm_ioapic, dev); | |
490 | } | |
491 | ||
bda9020e | 492 | static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr) |
1fd4f2a5 | 493 | { |
1fd4f2a5 ED |
494 | return ((addr >= ioapic->base_address && |
495 | (addr < ioapic->base_address + IOAPIC_MEM_LENGTH))); | |
496 | } | |
497 | ||
e32edf4f NN |
498 | static int ioapic_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *this, |
499 | gpa_t addr, int len, void *val) | |
1fd4f2a5 | 500 | { |
d76685c4 | 501 | struct kvm_ioapic *ioapic = to_ioapic(this); |
1fd4f2a5 | 502 | u32 result; |
bda9020e MT |
503 | if (!ioapic_in_range(ioapic, addr)) |
504 | return -EOPNOTSUPP; | |
1fd4f2a5 | 505 | |
e25e3ed5 | 506 | ioapic_debug("addr %lx\n", (unsigned long)addr); |
1fd4f2a5 ED |
507 | ASSERT(!(addr & 0xf)); /* check alignment */ |
508 | ||
509 | addr &= 0xff; | |
46a47b1e | 510 | spin_lock(&ioapic->lock); |
1fd4f2a5 ED |
511 | switch (addr) { |
512 | case IOAPIC_REG_SELECT: | |
513 | result = ioapic->ioregsel; | |
514 | break; | |
515 | ||
516 | case IOAPIC_REG_WINDOW: | |
517 | result = ioapic_read_indirect(ioapic, addr, len); | |
518 | break; | |
519 | ||
520 | default: | |
521 | result = 0; | |
522 | break; | |
523 | } | |
46a47b1e | 524 | spin_unlock(&ioapic->lock); |
eba0226b | 525 | |
1fd4f2a5 ED |
526 | switch (len) { |
527 | case 8: | |
528 | *(u64 *) val = result; | |
529 | break; | |
530 | case 1: | |
531 | case 2: | |
532 | case 4: | |
533 | memcpy(val, (char *)&result, len); | |
534 | break; | |
535 | default: | |
536 | printk(KERN_WARNING "ioapic: wrong length %d\n", len); | |
537 | } | |
bda9020e | 538 | return 0; |
1fd4f2a5 ED |
539 | } |
540 | ||
e32edf4f NN |
541 | static int ioapic_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *this, |
542 | gpa_t addr, int len, const void *val) | |
1fd4f2a5 | 543 | { |
d76685c4 | 544 | struct kvm_ioapic *ioapic = to_ioapic(this); |
1fd4f2a5 | 545 | u32 data; |
bda9020e MT |
546 | if (!ioapic_in_range(ioapic, addr)) |
547 | return -EOPNOTSUPP; | |
1fd4f2a5 | 548 | |
e25e3ed5 LV |
549 | ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n", |
550 | (void*)addr, len, val); | |
1fd4f2a5 | 551 | ASSERT(!(addr & 0xf)); /* check alignment */ |
60eead79 | 552 | |
d77fe635 JS |
553 | switch (len) { |
554 | case 8: | |
555 | case 4: | |
1fd4f2a5 | 556 | data = *(u32 *) val; |
d77fe635 JS |
557 | break; |
558 | case 2: | |
559 | data = *(u16 *) val; | |
560 | break; | |
561 | case 1: | |
562 | data = *(u8 *) val; | |
563 | break; | |
564 | default: | |
1fd4f2a5 | 565 | printk(KERN_WARNING "ioapic: Unsupported size %d\n", len); |
eba0226b | 566 | return 0; |
1fd4f2a5 ED |
567 | } |
568 | ||
569 | addr &= 0xff; | |
46a47b1e | 570 | spin_lock(&ioapic->lock); |
1fd4f2a5 ED |
571 | switch (addr) { |
572 | case IOAPIC_REG_SELECT: | |
d77fe635 | 573 | ioapic->ioregsel = data & 0xFF; /* 8-bit register */ |
1fd4f2a5 ED |
574 | break; |
575 | ||
576 | case IOAPIC_REG_WINDOW: | |
577 | ioapic_write_indirect(ioapic, data); | |
578 | break; | |
579 | ||
580 | default: | |
581 | break; | |
582 | } | |
46a47b1e | 583 | spin_unlock(&ioapic->lock); |
bda9020e | 584 | return 0; |
1fd4f2a5 ED |
585 | } |
586 | ||
7940876e | 587 | static void kvm_ioapic_reset(struct kvm_ioapic *ioapic) |
8c392696 ED |
588 | { |
589 | int i; | |
590 | ||
184564ef | 591 | cancel_delayed_work_sync(&ioapic->eoi_inject); |
8c392696 ED |
592 | for (i = 0; i < IOAPIC_NUM_PINS; i++) |
593 | ioapic->redirtbl[i].fields.mask = 1; | |
594 | ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS; | |
595 | ioapic->ioregsel = 0; | |
596 | ioapic->irr = 0; | |
5bda6eed | 597 | ioapic->irr_delivered = 0; |
8c392696 | 598 | ioapic->id = 0; |
184564ef | 599 | memset(ioapic->irq_eoi, 0x00, IOAPIC_NUM_PINS); |
10606919 | 600 | rtc_irq_eoi_tracking_reset(ioapic); |
46a929bc | 601 | update_handled_vectors(ioapic); |
8c392696 ED |
602 | } |
603 | ||
d76685c4 GH |
604 | static const struct kvm_io_device_ops ioapic_mmio_ops = { |
605 | .read = ioapic_mmio_read, | |
606 | .write = ioapic_mmio_write, | |
d76685c4 GH |
607 | }; |
608 | ||
1fd4f2a5 ED |
609 | int kvm_ioapic_init(struct kvm *kvm) |
610 | { | |
611 | struct kvm_ioapic *ioapic; | |
090b7aff | 612 | int ret; |
1fd4f2a5 ED |
613 | |
614 | ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL); | |
615 | if (!ioapic) | |
616 | return -ENOMEM; | |
46a47b1e | 617 | spin_lock_init(&ioapic->lock); |
184564ef | 618 | INIT_DELAYED_WORK(&ioapic->eoi_inject, kvm_ioapic_eoi_inject_work); |
d7deeeb0 | 619 | kvm->arch.vioapic = ioapic; |
8c392696 | 620 | kvm_ioapic_reset(ioapic); |
d76685c4 | 621 | kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops); |
1fd4f2a5 | 622 | ioapic->kvm = kvm; |
79fac95e | 623 | mutex_lock(&kvm->slots_lock); |
743eeb0b SL |
624 | ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, ioapic->base_address, |
625 | IOAPIC_MEM_LENGTH, &ioapic->dev); | |
79fac95e | 626 | mutex_unlock(&kvm->slots_lock); |
1ae77bad WY |
627 | if (ret < 0) { |
628 | kvm->arch.vioapic = NULL; | |
090b7aff | 629 | kfree(ioapic); |
1ae77bad | 630 | } |
090b7aff GH |
631 | |
632 | return ret; | |
1fd4f2a5 | 633 | } |
75858a84 | 634 | |
72bb2fcd WY |
635 | void kvm_ioapic_destroy(struct kvm *kvm) |
636 | { | |
637 | struct kvm_ioapic *ioapic = kvm->arch.vioapic; | |
638 | ||
184564ef | 639 | cancel_delayed_work_sync(&ioapic->eoi_inject); |
72bb2fcd WY |
640 | if (ioapic) { |
641 | kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev); | |
642 | kvm->arch.vioapic = NULL; | |
643 | kfree(ioapic); | |
644 | } | |
645 | } | |
646 | ||
eba0226b GN |
647 | int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) |
648 | { | |
649 | struct kvm_ioapic *ioapic = ioapic_irqchip(kvm); | |
650 | if (!ioapic) | |
651 | return -EINVAL; | |
652 | ||
46a47b1e | 653 | spin_lock(&ioapic->lock); |
eba0226b | 654 | memcpy(state, ioapic, sizeof(struct kvm_ioapic_state)); |
5bda6eed | 655 | state->irr &= ~ioapic->irr_delivered; |
46a47b1e | 656 | spin_unlock(&ioapic->lock); |
eba0226b GN |
657 | return 0; |
658 | } | |
659 | ||
660 | int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) | |
661 | { | |
662 | struct kvm_ioapic *ioapic = ioapic_irqchip(kvm); | |
663 | if (!ioapic) | |
664 | return -EINVAL; | |
665 | ||
46a47b1e | 666 | spin_lock(&ioapic->lock); |
eba0226b | 667 | memcpy(ioapic, state, sizeof(struct kvm_ioapic_state)); |
673f7b42 | 668 | ioapic->irr = 0; |
5bda6eed | 669 | ioapic->irr_delivered = 0; |
46a929bc | 670 | update_handled_vectors(ioapic); |
3d81bc7e | 671 | kvm_vcpu_request_scan_ioapic(kvm); |
673f7b42 | 672 | kvm_ioapic_inject_all(ioapic, state->irr); |
46a47b1e | 673 | spin_unlock(&ioapic->lock); |
eba0226b GN |
674 | return 0; |
675 | } |