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Eddie Dong1fd4f2a2007-07-18 12:03:39 +03001/*
2 * Copyright (C) 2001 MandrakeSoft S.A.
Avi Kivity221d0592010-05-23 18:37:00 +03003 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
Eddie Dong1fd4f2a2007-07-18 12:03:39 +03004 *
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
Avi Kivityedf88412007-12-16 11:02:48 +020030#include <linux/kvm_host.h>
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030031#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Yang Zhangc7c9c562013-01-25 10:18:51 +080038#include <linux/export.h>
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030039#include <asm/processor.h>
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030040#include <asm/page.h>
41#include <asm/current.h>
Gleb Natapov1000ff82009-07-07 16:00:57 +030042#include <trace/events/kvm.h>
Zhang Xiantao82470192007-12-17 13:59:56 +080043
44#include "ioapic.h"
45#include "lapic.h"
Marcelo Tosattif5244722008-07-26 17:01:00 -030046#include "irq.h"
Zhang Xiantao82470192007-12-17 13:59:56 +080047
Laurent Viviere25e3ed2007-10-12 11:01:59 +020048#if 0
49#define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg)
50#else
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030051#define ioapic_debug(fmt, arg...)
Laurent Viviere25e3ed2007-10-12 11:01:59 +020052#endif
Paolo Bonzini0b10a1c2014-03-18 11:51:29 +010053static int ioapic_service(struct kvm_ioapic *vioapic, int irq,
Yang Zhangaa2fbe62013-04-11 19:21:40 +080054 bool line_status);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030055
56static 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
Andy Honiga2c118b2013-02-20 14:49:16 -080078 if (redir_index < IOAPIC_NUM_PINS)
79 redir_content =
80 ioapic->redirtbl[redir_index].bits;
81 else
82 redir_content = ~0ULL;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030083
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030084 result = (ioapic->ioregsel & 0x1) ?
85 (redir_content >> 32) & 0xffffffff :
86 redir_content & 0xffffffff;
87 break;
88 }
89 }
90
91 return result;
92}
93
Yang Zhang10606912013-04-11 19:21:38 +080094static 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
100static void __rtc_irq_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
101{
102 bool new_val, old_val;
103 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
104 union kvm_ioapic_redirect_entry *e;
105
106 e = &ioapic->redirtbl[RTC_GSI];
107 if (!kvm_apic_match_dest(vcpu, NULL, 0, e->fields.dest_id,
108 e->fields.dest_mode))
109 return;
110
111 new_val = kvm_apic_pending_eoi(vcpu, e->fields.vector);
112 old_val = test_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
113
114 if (new_val == old_val)
115 return;
116
117 if (new_val) {
118 __set_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
119 ioapic->rtc_status.pending_eoi++;
120 } else {
121 __clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
122 ioapic->rtc_status.pending_eoi--;
123 }
124
125 WARN_ON(ioapic->rtc_status.pending_eoi < 0);
126}
127
128void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
129{
130 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
131
132 spin_lock(&ioapic->lock);
133 __rtc_irq_eoi_tracking_restore_one(vcpu);
134 spin_unlock(&ioapic->lock);
135}
136
137static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic)
138{
139 struct kvm_vcpu *vcpu;
140 int i;
141
142 if (RTC_GSI >= IOAPIC_NUM_PINS)
143 return;
144
145 rtc_irq_eoi_tracking_reset(ioapic);
146 kvm_for_each_vcpu(i, vcpu, ioapic->kvm)
147 __rtc_irq_eoi_tracking_restore_one(vcpu);
148}
149
Yang Zhang2c2bf012013-04-11 19:21:41 +0800150static void rtc_irq_eoi(struct kvm_ioapic *ioapic, struct kvm_vcpu *vcpu)
151{
152 if (test_and_clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map))
153 --ioapic->rtc_status.pending_eoi;
154
155 WARN_ON(ioapic->rtc_status.pending_eoi < 0);
156}
157
158static bool rtc_irq_check_coalesced(struct kvm_ioapic *ioapic)
159{
160 if (ioapic->rtc_status.pending_eoi > 0)
161 return true; /* coalesced */
162
163 return false;
164}
165
Paolo Bonzini44847de2014-03-18 12:00:14 +0100166static int ioapic_set_irq(struct kvm_ioapic *ioapic, unsigned int irq,
167 int irq_level, bool line_status)
168{
169 union kvm_ioapic_redirect_entry entry;
170 u32 mask = 1 << irq;
171 u32 old_irr;
172 int edge, ret;
173
174 entry = ioapic->redirtbl[irq];
175 edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
176
177 if (!irq_level) {
178 ioapic->irr &= ~mask;
179 ret = 1;
180 goto out;
181 }
182
183 /*
184 * Return 0 for coalesced interrupts; for edge-triggered interrupts,
185 * this only happens if a previous edge has not been delivered due
186 * do masking. For level interrupts, the remote_irr field tells
187 * us if the interrupt is waiting for an EOI.
188 *
189 * RTC is special: it is edge-triggered, but userspace likes to know
190 * if it has been already ack-ed via EOI because coalesced RTC
191 * interrupts lead to time drift in Windows guests. So we track
192 * EOI manually for the RTC interrupt.
193 */
194 if (irq == RTC_GSI && line_status &&
195 rtc_irq_check_coalesced(ioapic)) {
196 ret = 0;
197 goto out;
198 }
199
200 old_irr = ioapic->irr;
201 ioapic->irr |= mask;
202 if ((edge && old_irr == ioapic->irr) ||
203 (!edge && entry.fields.remote_irr)) {
204 ret = 0;
205 goto out;
206 }
207
208 ret = ioapic_service(ioapic, irq, line_status);
209
210out:
211 trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
212 return ret;
213}
214
Paolo Bonzini673f7b42014-03-18 11:39:23 +0100215static void kvm_ioapic_inject_all(struct kvm_ioapic *ioapic, unsigned long irr)
216{
217 u32 idx;
218
219 rtc_irq_eoi_tracking_reset(ioapic);
220 for_each_set_bit(idx, &irr, IOAPIC_NUM_PINS)
221 ioapic_set_irq(ioapic, idx, 1, true);
222
223 kvm_rtc_eoi_tracking_restore_all(ioapic);
224}
225
226
Avi Kivity46a929b2009-12-28 14:08:30 +0200227static void update_handled_vectors(struct kvm_ioapic *ioapic)
228{
229 DECLARE_BITMAP(handled_vectors, 256);
230 int i;
231
232 memset(handled_vectors, 0, sizeof(handled_vectors));
233 for (i = 0; i < IOAPIC_NUM_PINS; ++i)
234 __set_bit(ioapic->redirtbl[i].fields.vector, handled_vectors);
235 memcpy(ioapic->handled_vectors, handled_vectors,
236 sizeof(handled_vectors));
237 smp_wmb();
238}
239
Yang Zhangcf9e65b2013-04-11 19:25:14 +0800240void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap,
241 u32 *tmr)
Yang Zhangc7c9c562013-01-25 10:18:51 +0800242{
243 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
244 union kvm_ioapic_redirect_entry *e;
Yang Zhangc7c9c562013-01-25 10:18:51 +0800245 int index;
246
247 spin_lock(&ioapic->lock);
Yang Zhangc7c9c562013-01-25 10:18:51 +0800248 for (index = 0; index < IOAPIC_NUM_PINS; index++) {
249 e = &ioapic->redirtbl[index];
250 if (!e->fields.mask &&
251 (e->fields.trig_mode == IOAPIC_LEVEL_TRIG ||
252 kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC,
Yang Zhangf3bff632013-04-11 19:21:39 +0800253 index) || index == RTC_GSI)) {
Yang Zhang44944d42013-04-07 08:25:18 +0800254 if (kvm_apic_match_dest(vcpu, NULL, 0,
Yang Zhangcf9e65b2013-04-11 19:25:14 +0800255 e->fields.dest_id, e->fields.dest_mode)) {
256 __set_bit(e->fields.vector,
257 (unsigned long *)eoi_exit_bitmap);
258 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG)
259 __set_bit(e->fields.vector,
260 (unsigned long *)tmr);
261 }
Yang Zhangc7c9c562013-01-25 10:18:51 +0800262 }
263 }
264 spin_unlock(&ioapic->lock);
265}
Yang Zhangc7c9c562013-01-25 10:18:51 +0800266
Yang Zhang3d81bc72013-04-11 19:25:13 +0800267#ifdef CONFIG_X86
268void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
Yang Zhangc7c9c562013-01-25 10:18:51 +0800269{
270 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
271
Yang Zhang3d81bc72013-04-11 19:25:13 +0800272 if (!ioapic)
Yang Zhangc7c9c562013-01-25 10:18:51 +0800273 return;
Yang Zhang3d81bc72013-04-11 19:25:13 +0800274 kvm_make_scan_ioapic_request(kvm);
Yang Zhangc7c9c562013-01-25 10:18:51 +0800275}
Yang Zhang3d81bc72013-04-11 19:25:13 +0800276#else
277void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
278{
279 return;
280}
281#endif
Yang Zhangc7c9c562013-01-25 10:18:51 +0800282
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300283static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
284{
285 unsigned index;
Avi Kivity75858a82009-01-04 17:10:50 +0200286 bool mask_before, mask_after;
Gleb Natapov70f93da2009-07-05 18:48:12 +0300287 union kvm_ioapic_redirect_entry *e;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300288
289 switch (ioapic->ioregsel) {
290 case IOAPIC_REG_VERSION:
291 /* Writes are ignored. */
292 break;
293
294 case IOAPIC_REG_APIC_ID:
295 ioapic->id = (val >> 24) & 0xf;
296 break;
297
298 case IOAPIC_REG_ARB_ID:
299 break;
300
301 default:
302 index = (ioapic->ioregsel - 0x10) >> 1;
303
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200304 ioapic_debug("change redir index %x val %x\n", index, val);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300305 if (index >= IOAPIC_NUM_PINS)
306 return;
Gleb Natapov70f93da2009-07-05 18:48:12 +0300307 e = &ioapic->redirtbl[index];
308 mask_before = e->fields.mask;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300309 if (ioapic->ioregsel & 1) {
Gleb Natapov70f93da2009-07-05 18:48:12 +0300310 e->bits &= 0xffffffff;
311 e->bits |= (u64) val << 32;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300312 } else {
Gleb Natapov70f93da2009-07-05 18:48:12 +0300313 e->bits &= ~0xffffffffULL;
314 e->bits |= (u32) val;
315 e->fields.remote_irr = 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300316 }
Avi Kivity46a929b2009-12-28 14:08:30 +0200317 update_handled_vectors(ioapic);
Gleb Natapov70f93da2009-07-05 18:48:12 +0300318 mask_after = e->fields.mask;
Avi Kivity75858a82009-01-04 17:10:50 +0200319 if (mask_before != mask_after)
Gleb Natapov4a994352010-07-11 15:32:23 +0300320 kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after);
Gleb Natapov70f93da2009-07-05 18:48:12 +0300321 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG
Gleb Natapovb4a2f5e2009-07-05 18:48:11 +0300322 && ioapic->irr & (1 << index))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800323 ioapic_service(ioapic, index, false);
Yang Zhang3d81bc72013-04-11 19:25:13 +0800324 kvm_vcpu_request_scan_ioapic(ioapic->kvm);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300325 break;
326 }
327}
328
Paolo Bonzini0b10a1c2014-03-18 11:51:29 +0100329static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300330{
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200331 union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
332 struct kvm_lapic_irq irqe;
Yang Zhang2c2bf012013-04-11 19:21:41 +0800333 int ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300334
Paolo Bonzini0b10a1c2014-03-18 11:51:29 +0100335 if (entry->fields.mask)
336 return -1;
337
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300338 ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200339 "vector=%x trig_mode=%x\n",
Liu Yuana38f84c2011-04-21 14:53:57 +0800340 entry->fields.dest_id, entry->fields.dest_mode,
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200341 entry->fields.delivery_mode, entry->fields.vector,
342 entry->fields.trig_mode);
343
344 irqe.dest_id = entry->fields.dest_id;
345 irqe.vector = entry->fields.vector;
346 irqe.dest_mode = entry->fields.dest_mode;
347 irqe.trig_mode = entry->fields.trig_mode;
348 irqe.delivery_mode = entry->fields.delivery_mode << 8;
349 irqe.level = 1;
350 irqe.shorthand = 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300351
Paolo Bonzini0bc830b2014-03-18 10:47:17 +0100352 if (irqe.trig_mode == IOAPIC_EDGE_TRIG)
353 ioapic->irr &= ~(1 << irq);
354
Yang Zhang2c2bf012013-04-11 19:21:41 +0800355 if (irq == RTC_GSI && line_status) {
356 BUG_ON(ioapic->rtc_status.pending_eoi != 0);
357 ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe,
358 ioapic->rtc_status.dest_map);
359 ioapic->rtc_status.pending_eoi = ret;
360 } else
361 ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL);
362
Paolo Bonzini0b10a1c2014-03-18 11:51:29 +0100363 if (ret && irqe.trig_mode == IOAPIC_LEVEL_TRIG)
364 entry->fields.remote_irr = 1;
365
Yang Zhang2c2bf012013-04-11 19:21:41 +0800366 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300367}
368
Michael S. Tsirkin1a577b722012-07-19 13:45:20 +0300369int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800370 int level, bool line_status)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300371{
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300372 int ret, irq_level;
373
374 BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300375
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300376 spin_lock(&ioapic->lock);
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300377 irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],
378 irq_source_id, level);
Paolo Bonzini44847de2014-03-18 12:00:14 +0100379 ret = ioapic_set_irq(ioapic, irq, irq_level, line_status);
Yang Zhang2c2bf012013-04-11 19:21:41 +0800380
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300381 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300382
Gleb Natapov49256632009-02-04 17:28:14 +0200383 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300384}
385
Michael S. Tsirkin1a577b722012-07-19 13:45:20 +0300386void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id)
387{
388 int i;
389
390 spin_lock(&ioapic->lock);
391 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
392 __clear_bit(irq_source_id, &ioapic->irq_states[i]);
393 spin_unlock(&ioapic->lock);
394}
395
Yang Zhang1fcc7892013-04-11 19:21:35 +0800396static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu,
397 struct kvm_ioapic *ioapic, int vector, int trigger_mode)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300398{
Gleb Natapoveba02262009-08-24 11:54:25 +0300399 int i;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300400
Gleb Natapoveba02262009-08-24 11:54:25 +0300401 for (i = 0; i < IOAPIC_NUM_PINS; i++) {
402 union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300403
Gleb Natapoveba02262009-08-24 11:54:25 +0300404 if (ent->fields.vector != vector)
405 continue;
Marcelo Tosattif5244722008-07-26 17:01:00 -0300406
Yang Zhang2c2bf012013-04-11 19:21:41 +0800407 if (i == RTC_GSI)
408 rtc_irq_eoi(ioapic, vcpu);
Gleb Natapoveba02262009-08-24 11:54:25 +0300409 /*
410 * We are dropping lock while calling ack notifiers because ack
411 * notifier callbacks for assigned devices call into IOAPIC
412 * recursively. Since remote_irr is cleared only after call
413 * to notifiers if the same vector will be delivered while lock
414 * is dropped it will be put into irr and will be delivered
415 * after ack notifier returns.
416 */
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300417 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300418 kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300419 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300420
421 if (trigger_mode != IOAPIC_LEVEL_TRIG)
422 continue;
423
Marcelo Tosattif5244722008-07-26 17:01:00 -0300424 ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
425 ent->fields.remote_irr = 0;
Paolo Bonzini0b10a1c2014-03-18 11:51:29 +0100426 if (ioapic->irr & (1 << i))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800427 ioapic_service(ioapic, i, false);
Marcelo Tosattif5244722008-07-26 17:01:00 -0300428 }
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300429}
430
Michael S. Tsirkina0c9a8222012-04-11 18:49:55 +0300431bool kvm_ioapic_handles_vector(struct kvm *kvm, int vector)
432{
433 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
434 smp_rmb();
435 return test_bit(vector, ioapic->handled_vectors);
436}
437
Yang Zhang1fcc7892013-04-11 19:21:35 +0800438void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector, int trigger_mode)
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700439{
Yang Zhang1fcc7892013-04-11 19:21:35 +0800440 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700441
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300442 spin_lock(&ioapic->lock);
Yang Zhang1fcc7892013-04-11 19:21:35 +0800443 __kvm_ioapic_update_eoi(vcpu, ioapic, vector, trigger_mode);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300444 spin_unlock(&ioapic->lock);
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700445}
446
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400447static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
448{
449 return container_of(dev, struct kvm_ioapic, dev);
450}
451
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300452static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300453{
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300454 return ((addr >= ioapic->base_address &&
455 (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
456}
457
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300458static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
459 void *val)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300460{
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400461 struct kvm_ioapic *ioapic = to_ioapic(this);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300462 u32 result;
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300463 if (!ioapic_in_range(ioapic, addr))
464 return -EOPNOTSUPP;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300465
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200466 ioapic_debug("addr %lx\n", (unsigned long)addr);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300467 ASSERT(!(addr & 0xf)); /* check alignment */
468
469 addr &= 0xff;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300470 spin_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300471 switch (addr) {
472 case IOAPIC_REG_SELECT:
473 result = ioapic->ioregsel;
474 break;
475
476 case IOAPIC_REG_WINDOW:
477 result = ioapic_read_indirect(ioapic, addr, len);
478 break;
479
480 default:
481 result = 0;
482 break;
483 }
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300484 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300485
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300486 switch (len) {
487 case 8:
488 *(u64 *) val = result;
489 break;
490 case 1:
491 case 2:
492 case 4:
493 memcpy(val, (char *)&result, len);
494 break;
495 default:
496 printk(KERN_WARNING "ioapic: wrong length %d\n", len);
497 }
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300498 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300499}
500
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300501static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
502 const void *val)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300503{
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400504 struct kvm_ioapic *ioapic = to_ioapic(this);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300505 u32 data;
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300506 if (!ioapic_in_range(ioapic, addr))
507 return -EOPNOTSUPP;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300508
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200509 ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
510 (void*)addr, len, val);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300511 ASSERT(!(addr & 0xf)); /* check alignment */
Marcelo Tosatti60eead72009-06-04 15:08:23 -0300512
Julian Stecklinad77fe632011-11-23 13:54:30 +0100513 switch (len) {
514 case 8:
515 case 4:
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300516 data = *(u32 *) val;
Julian Stecklinad77fe632011-11-23 13:54:30 +0100517 break;
518 case 2:
519 data = *(u16 *) val;
520 break;
521 case 1:
522 data = *(u8 *) val;
523 break;
524 default:
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300525 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
Gleb Natapoveba02262009-08-24 11:54:25 +0300526 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300527 }
528
529 addr &= 0xff;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300530 spin_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300531 switch (addr) {
532 case IOAPIC_REG_SELECT:
Julian Stecklinad77fe632011-11-23 13:54:30 +0100533 ioapic->ioregsel = data & 0xFF; /* 8-bit register */
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300534 break;
535
536 case IOAPIC_REG_WINDOW:
537 ioapic_write_indirect(ioapic, data);
538 break;
Zhang Xiantaob1fd3d32007-12-02 22:53:07 +0800539#ifdef CONFIG_IA64
540 case IOAPIC_REG_EOI:
Yang Zhang1fcc7892013-04-11 19:21:35 +0800541 __kvm_ioapic_update_eoi(NULL, ioapic, data, IOAPIC_LEVEL_TRIG);
Zhang Xiantaob1fd3d32007-12-02 22:53:07 +0800542 break;
543#endif
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300544
545 default:
546 break;
547 }
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300548 spin_unlock(&ioapic->lock);
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300549 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300550}
551
Stephen Hemminger79408762013-12-29 12:12:29 -0800552static void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
Eddie Dong8c392692007-10-10 12:15:54 +0200553{
554 int i;
555
556 for (i = 0; i < IOAPIC_NUM_PINS; i++)
557 ioapic->redirtbl[i].fields.mask = 1;
558 ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
559 ioapic->ioregsel = 0;
560 ioapic->irr = 0;
561 ioapic->id = 0;
Yang Zhang10606912013-04-11 19:21:38 +0800562 rtc_irq_eoi_tracking_reset(ioapic);
Avi Kivity46a929b2009-12-28 14:08:30 +0200563 update_handled_vectors(ioapic);
Eddie Dong8c392692007-10-10 12:15:54 +0200564}
565
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400566static const struct kvm_io_device_ops ioapic_mmio_ops = {
567 .read = ioapic_mmio_read,
568 .write = ioapic_mmio_write,
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400569};
570
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300571int kvm_ioapic_init(struct kvm *kvm)
572{
573 struct kvm_ioapic *ioapic;
Gregory Haskins090b7af2009-07-07 17:08:44 -0400574 int ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300575
576 ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
577 if (!ioapic)
578 return -ENOMEM;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300579 spin_lock_init(&ioapic->lock);
Zhang Xiantaod7deeeb02007-12-14 10:17:34 +0800580 kvm->arch.vioapic = ioapic;
Eddie Dong8c392692007-10-10 12:15:54 +0200581 kvm_ioapic_reset(ioapic);
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400582 kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300583 ioapic->kvm = kvm;
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200584 mutex_lock(&kvm->slots_lock);
Sasha Levin743eeb02011-07-27 16:00:48 +0300585 ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, ioapic->base_address,
586 IOAPIC_MEM_LENGTH, &ioapic->dev);
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200587 mutex_unlock(&kvm->slots_lock);
Wei Yongjun1ae77ba2010-02-09 10:31:09 +0800588 if (ret < 0) {
589 kvm->arch.vioapic = NULL;
Gregory Haskins090b7af2009-07-07 17:08:44 -0400590 kfree(ioapic);
Wei Yongjun1ae77ba2010-02-09 10:31:09 +0800591 }
Gregory Haskins090b7af2009-07-07 17:08:44 -0400592
593 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300594}
Avi Kivity75858a82009-01-04 17:10:50 +0200595
Wei Yongjun72bb2fc2010-02-09 10:33:03 +0800596void kvm_ioapic_destroy(struct kvm *kvm)
597{
598 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
599
600 if (ioapic) {
601 kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev);
602 kvm->arch.vioapic = NULL;
603 kfree(ioapic);
604 }
605}
606
Gleb Natapoveba02262009-08-24 11:54:25 +0300607int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
608{
609 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
610 if (!ioapic)
611 return -EINVAL;
612
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300613 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300614 memcpy(state, ioapic, sizeof(struct kvm_ioapic_state));
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300615 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300616 return 0;
617}
618
619int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
620{
621 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
622 if (!ioapic)
623 return -EINVAL;
624
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300625 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300626 memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
Paolo Bonzini673f7b42014-03-18 11:39:23 +0100627 ioapic->irr = 0;
Avi Kivity46a929b2009-12-28 14:08:30 +0200628 update_handled_vectors(ioapic);
Yang Zhang3d81bc72013-04-11 19:25:13 +0800629 kvm_vcpu_request_scan_ioapic(kvm);
Paolo Bonzini673f7b42014-03-18 11:39:23 +0100630 kvm_ioapic_inject_all(ioapic, state->irr);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300631 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300632 return 0;
633}