blob: 5eaf18f90e832ddd2ef31cc302a1830d6dbad499 [file] [log] [blame]
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
Yang Zhangaa2fbe62013-04-11 19:21:40 +080053static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq,
54 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
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800166static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx,
167 bool line_status)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300168{
Sheng Yangcf9e4e12009-02-11 16:03:36 +0800169 union kvm_ioapic_redirect_entry *pent;
Gleb Natapov49256632009-02-04 17:28:14 +0200170 int injected = -1;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300171
172 pent = &ioapic->redirtbl[idx];
173
174 if (!pent->fields.mask) {
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800175 injected = ioapic_deliver(ioapic, idx, line_status);
Marcelo Tosattiff4b9df2008-06-05 00:08:11 -0300176 if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300177 pent->fields.remote_irr = 1;
178 }
Gleb Natapov49256632009-02-04 17:28:14 +0200179
180 return injected;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300181}
182
Avi Kivity46a929b2009-12-28 14:08:30 +0200183static void update_handled_vectors(struct kvm_ioapic *ioapic)
184{
185 DECLARE_BITMAP(handled_vectors, 256);
186 int i;
187
188 memset(handled_vectors, 0, sizeof(handled_vectors));
189 for (i = 0; i < IOAPIC_NUM_PINS; ++i)
190 __set_bit(ioapic->redirtbl[i].fields.vector, handled_vectors);
191 memcpy(ioapic->handled_vectors, handled_vectors,
192 sizeof(handled_vectors));
193 smp_wmb();
194}
195
Yang Zhangcf9e65b2013-04-11 19:25:14 +0800196void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap,
197 u32 *tmr)
Yang Zhangc7c9c562013-01-25 10:18:51 +0800198{
199 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
200 union kvm_ioapic_redirect_entry *e;
Yang Zhangc7c9c562013-01-25 10:18:51 +0800201 int index;
202
203 spin_lock(&ioapic->lock);
Yang Zhangc7c9c562013-01-25 10:18:51 +0800204 for (index = 0; index < IOAPIC_NUM_PINS; index++) {
205 e = &ioapic->redirtbl[index];
Paolo Bonzini1933d1c2014-07-30 18:07:24 +0200206 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG ||
207 kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index) ||
208 index == RTC_GSI) {
Yang Zhang44944d42013-04-07 08:25:18 +0800209 if (kvm_apic_match_dest(vcpu, NULL, 0,
Yang Zhangcf9e65b2013-04-11 19:25:14 +0800210 e->fields.dest_id, e->fields.dest_mode)) {
211 __set_bit(e->fields.vector,
212 (unsigned long *)eoi_exit_bitmap);
213 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG)
214 __set_bit(e->fields.vector,
215 (unsigned long *)tmr);
216 }
Yang Zhangc7c9c562013-01-25 10:18:51 +0800217 }
218 }
219 spin_unlock(&ioapic->lock);
220}
Yang Zhangc7c9c562013-01-25 10:18:51 +0800221
Yang Zhang3d81bc72013-04-11 19:25:13 +0800222#ifdef CONFIG_X86
223void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
Yang Zhangc7c9c562013-01-25 10:18:51 +0800224{
225 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
226
Yang Zhang3d81bc72013-04-11 19:25:13 +0800227 if (!ioapic)
Yang Zhangc7c9c562013-01-25 10:18:51 +0800228 return;
Yang Zhang3d81bc72013-04-11 19:25:13 +0800229 kvm_make_scan_ioapic_request(kvm);
Yang Zhangc7c9c562013-01-25 10:18:51 +0800230}
Yang Zhang3d81bc72013-04-11 19:25:13 +0800231#else
232void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
233{
234 return;
235}
236#endif
Yang Zhangc7c9c562013-01-25 10:18:51 +0800237
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300238static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
239{
240 unsigned index;
Avi Kivity75858a82009-01-04 17:10:50 +0200241 bool mask_before, mask_after;
Gleb Natapov70f93da2009-07-05 18:48:12 +0300242 union kvm_ioapic_redirect_entry *e;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300243
244 switch (ioapic->ioregsel) {
245 case IOAPIC_REG_VERSION:
246 /* Writes are ignored. */
247 break;
248
249 case IOAPIC_REG_APIC_ID:
250 ioapic->id = (val >> 24) & 0xf;
251 break;
252
253 case IOAPIC_REG_ARB_ID:
254 break;
255
256 default:
257 index = (ioapic->ioregsel - 0x10) >> 1;
258
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200259 ioapic_debug("change redir index %x val %x\n", index, val);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300260 if (index >= IOAPIC_NUM_PINS)
261 return;
Gleb Natapov70f93da2009-07-05 18:48:12 +0300262 e = &ioapic->redirtbl[index];
263 mask_before = e->fields.mask;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300264 if (ioapic->ioregsel & 1) {
Gleb Natapov70f93da2009-07-05 18:48:12 +0300265 e->bits &= 0xffffffff;
266 e->bits |= (u64) val << 32;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300267 } else {
Gleb Natapov70f93da2009-07-05 18:48:12 +0300268 e->bits &= ~0xffffffffULL;
269 e->bits |= (u32) val;
270 e->fields.remote_irr = 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300271 }
Avi Kivity46a929b2009-12-28 14:08:30 +0200272 update_handled_vectors(ioapic);
Gleb Natapov70f93da2009-07-05 18:48:12 +0300273 mask_after = e->fields.mask;
Avi Kivity75858a82009-01-04 17:10:50 +0200274 if (mask_before != mask_after)
Gleb Natapov4a994352010-07-11 15:32:23 +0300275 kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after);
Gleb Natapov70f93da2009-07-05 18:48:12 +0300276 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG
Gleb Natapovb4a2f5e2009-07-05 18:48:11 +0300277 && ioapic->irr & (1 << index))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800278 ioapic_service(ioapic, index, false);
Yang Zhang3d81bc72013-04-11 19:25:13 +0800279 kvm_vcpu_request_scan_ioapic(ioapic->kvm);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300280 break;
281 }
282}
283
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800284static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq, bool line_status)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300285{
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200286 union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
287 struct kvm_lapic_irq irqe;
Yang Zhang2c2bf012013-04-11 19:21:41 +0800288 int ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300289
290 ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200291 "vector=%x trig_mode=%x\n",
Liu Yuana38f84c2011-04-21 14:53:57 +0800292 entry->fields.dest_id, entry->fields.dest_mode,
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200293 entry->fields.delivery_mode, entry->fields.vector,
294 entry->fields.trig_mode);
295
296 irqe.dest_id = entry->fields.dest_id;
297 irqe.vector = entry->fields.vector;
298 irqe.dest_mode = entry->fields.dest_mode;
299 irqe.trig_mode = entry->fields.trig_mode;
300 irqe.delivery_mode = entry->fields.delivery_mode << 8;
301 irqe.level = 1;
302 irqe.shorthand = 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300303
Yang Zhang2c2bf012013-04-11 19:21:41 +0800304 if (irq == RTC_GSI && line_status) {
305 BUG_ON(ioapic->rtc_status.pending_eoi != 0);
306 ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe,
307 ioapic->rtc_status.dest_map);
Paolo Bonzinia9ded882014-03-28 20:41:50 +0100308 ioapic->rtc_status.pending_eoi = (ret < 0 ? 0 : ret);
Yang Zhang2c2bf012013-04-11 19:21:41 +0800309 } else
310 ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL);
311
312 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300313}
314
Michael S. Tsirkin1a577b722012-07-19 13:45:20 +0300315int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800316 int level, bool line_status)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300317{
Marcelo Tosatti07dc7262010-06-02 11:26:26 -0300318 u32 old_irr;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300319 u32 mask = 1 << irq;
Sheng Yangcf9e4e12009-02-11 16:03:36 +0800320 union kvm_ioapic_redirect_entry entry;
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300321 int ret, irq_level;
322
323 BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300324
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300325 spin_lock(&ioapic->lock);
Marcelo Tosatti07dc7262010-06-02 11:26:26 -0300326 old_irr = ioapic->irr;
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300327 irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],
328 irq_source_id, level);
329 entry = ioapic->redirtbl[irq];
330 irq_level ^= entry.fields.polarity;
331 if (!irq_level) {
332 ioapic->irr &= ~mask;
333 ret = 1;
334 } else {
335 int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
Yang Zhang2c2bf012013-04-11 19:21:41 +0800336
337 if (irq == RTC_GSI && line_status &&
338 rtc_irq_check_coalesced(ioapic)) {
339 ret = 0; /* coalesced */
340 goto out;
341 }
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300342 ioapic->irr |= mask;
343 if ((edge && old_irr != ioapic->irr) ||
344 (!edge && !entry.fields.remote_irr))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800345 ret = ioapic_service(ioapic, irq, line_status);
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300346 else
347 ret = 0; /* report coalesced interrupt */
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300348 }
Yang Zhang2c2bf012013-04-11 19:21:41 +0800349out:
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300350 trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300351 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300352
Gleb Natapov49256632009-02-04 17:28:14 +0200353 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300354}
355
Michael S. Tsirkin1a577b722012-07-19 13:45:20 +0300356void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id)
357{
358 int i;
359
360 spin_lock(&ioapic->lock);
361 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
362 __clear_bit(irq_source_id, &ioapic->irq_states[i]);
363 spin_unlock(&ioapic->lock);
364}
365
Yang Zhang1fcc7892013-04-11 19:21:35 +0800366static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu,
367 struct kvm_ioapic *ioapic, int vector, int trigger_mode)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300368{
Gleb Natapoveba02262009-08-24 11:54:25 +0300369 int i;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300370
Gleb Natapoveba02262009-08-24 11:54:25 +0300371 for (i = 0; i < IOAPIC_NUM_PINS; i++) {
372 union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300373
Gleb Natapoveba02262009-08-24 11:54:25 +0300374 if (ent->fields.vector != vector)
375 continue;
Marcelo Tosattif5244722008-07-26 17:01:00 -0300376
Yang Zhang2c2bf012013-04-11 19:21:41 +0800377 if (i == RTC_GSI)
378 rtc_irq_eoi(ioapic, vcpu);
Gleb Natapoveba02262009-08-24 11:54:25 +0300379 /*
380 * We are dropping lock while calling ack notifiers because ack
381 * notifier callbacks for assigned devices call into IOAPIC
382 * recursively. Since remote_irr is cleared only after call
383 * to notifiers if the same vector will be delivered while lock
384 * is dropped it will be put into irr and will be delivered
385 * after ack notifier returns.
386 */
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300387 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300388 kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300389 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300390
391 if (trigger_mode != IOAPIC_LEVEL_TRIG)
392 continue;
393
Marcelo Tosattif5244722008-07-26 17:01:00 -0300394 ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
395 ent->fields.remote_irr = 0;
Gleb Natapoveba02262009-08-24 11:54:25 +0300396 if (!ent->fields.mask && (ioapic->irr & (1 << i)))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800397 ioapic_service(ioapic, i, false);
Marcelo Tosattif5244722008-07-26 17:01:00 -0300398 }
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300399}
400
Michael S. Tsirkina0c9a8222012-04-11 18:49:55 +0300401bool kvm_ioapic_handles_vector(struct kvm *kvm, int vector)
402{
403 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
404 smp_rmb();
405 return test_bit(vector, ioapic->handled_vectors);
406}
407
Yang Zhang1fcc7892013-04-11 19:21:35 +0800408void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector, int trigger_mode)
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700409{
Yang Zhang1fcc7892013-04-11 19:21:35 +0800410 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700411
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300412 spin_lock(&ioapic->lock);
Yang Zhang1fcc7892013-04-11 19:21:35 +0800413 __kvm_ioapic_update_eoi(vcpu, ioapic, vector, trigger_mode);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300414 spin_unlock(&ioapic->lock);
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700415}
416
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400417static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
418{
419 return container_of(dev, struct kvm_ioapic, dev);
420}
421
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300422static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300423{
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300424 return ((addr >= ioapic->base_address &&
425 (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
426}
427
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300428static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
429 void *val)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300430{
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400431 struct kvm_ioapic *ioapic = to_ioapic(this);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300432 u32 result;
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300433 if (!ioapic_in_range(ioapic, addr))
434 return -EOPNOTSUPP;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300435
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200436 ioapic_debug("addr %lx\n", (unsigned long)addr);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300437 ASSERT(!(addr & 0xf)); /* check alignment */
438
439 addr &= 0xff;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300440 spin_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300441 switch (addr) {
442 case IOAPIC_REG_SELECT:
443 result = ioapic->ioregsel;
444 break;
445
446 case IOAPIC_REG_WINDOW:
447 result = ioapic_read_indirect(ioapic, addr, len);
448 break;
449
450 default:
451 result = 0;
452 break;
453 }
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300454 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300455
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300456 switch (len) {
457 case 8:
458 *(u64 *) val = result;
459 break;
460 case 1:
461 case 2:
462 case 4:
463 memcpy(val, (char *)&result, len);
464 break;
465 default:
466 printk(KERN_WARNING "ioapic: wrong length %d\n", len);
467 }
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300468 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300469}
470
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300471static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
472 const void *val)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300473{
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400474 struct kvm_ioapic *ioapic = to_ioapic(this);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300475 u32 data;
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300476 if (!ioapic_in_range(ioapic, addr))
477 return -EOPNOTSUPP;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300478
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200479 ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
480 (void*)addr, len, val);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300481 ASSERT(!(addr & 0xf)); /* check alignment */
Marcelo Tosatti60eead72009-06-04 15:08:23 -0300482
Julian Stecklinad77fe632011-11-23 13:54:30 +0100483 switch (len) {
484 case 8:
485 case 4:
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300486 data = *(u32 *) val;
Julian Stecklinad77fe632011-11-23 13:54:30 +0100487 break;
488 case 2:
489 data = *(u16 *) val;
490 break;
491 case 1:
492 data = *(u8 *) val;
493 break;
494 default:
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300495 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
Gleb Natapoveba02262009-08-24 11:54:25 +0300496 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300497 }
498
499 addr &= 0xff;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300500 spin_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300501 switch (addr) {
502 case IOAPIC_REG_SELECT:
Julian Stecklinad77fe632011-11-23 13:54:30 +0100503 ioapic->ioregsel = data & 0xFF; /* 8-bit register */
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300504 break;
505
506 case IOAPIC_REG_WINDOW:
507 ioapic_write_indirect(ioapic, data);
508 break;
Zhang Xiantaob1fd3d32007-12-02 22:53:07 +0800509#ifdef CONFIG_IA64
510 case IOAPIC_REG_EOI:
Yang Zhang1fcc7892013-04-11 19:21:35 +0800511 __kvm_ioapic_update_eoi(NULL, ioapic, data, IOAPIC_LEVEL_TRIG);
Zhang Xiantaob1fd3d32007-12-02 22:53:07 +0800512 break;
513#endif
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300514
515 default:
516 break;
517 }
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300518 spin_unlock(&ioapic->lock);
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300519 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300520}
521
Eddie Dong8c392692007-10-10 12:15:54 +0200522void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
523{
524 int i;
525
526 for (i = 0; i < IOAPIC_NUM_PINS; i++)
527 ioapic->redirtbl[i].fields.mask = 1;
528 ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
529 ioapic->ioregsel = 0;
530 ioapic->irr = 0;
531 ioapic->id = 0;
Yang Zhang10606912013-04-11 19:21:38 +0800532 rtc_irq_eoi_tracking_reset(ioapic);
Avi Kivity46a929b2009-12-28 14:08:30 +0200533 update_handled_vectors(ioapic);
Eddie Dong8c392692007-10-10 12:15:54 +0200534}
535
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400536static const struct kvm_io_device_ops ioapic_mmio_ops = {
537 .read = ioapic_mmio_read,
538 .write = ioapic_mmio_write,
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400539};
540
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300541int kvm_ioapic_init(struct kvm *kvm)
542{
543 struct kvm_ioapic *ioapic;
Gregory Haskins090b7af2009-07-07 17:08:44 -0400544 int ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300545
546 ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
547 if (!ioapic)
548 return -ENOMEM;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300549 spin_lock_init(&ioapic->lock);
Zhang Xiantaod7deeeb02007-12-14 10:17:34 +0800550 kvm->arch.vioapic = ioapic;
Eddie Dong8c392692007-10-10 12:15:54 +0200551 kvm_ioapic_reset(ioapic);
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400552 kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300553 ioapic->kvm = kvm;
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200554 mutex_lock(&kvm->slots_lock);
Sasha Levin743eeb02011-07-27 16:00:48 +0300555 ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, ioapic->base_address,
556 IOAPIC_MEM_LENGTH, &ioapic->dev);
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200557 mutex_unlock(&kvm->slots_lock);
Wei Yongjun1ae77ba2010-02-09 10:31:09 +0800558 if (ret < 0) {
559 kvm->arch.vioapic = NULL;
Gregory Haskins090b7af2009-07-07 17:08:44 -0400560 kfree(ioapic);
Wei Yongjun1ae77ba2010-02-09 10:31:09 +0800561 }
Gregory Haskins090b7af2009-07-07 17:08:44 -0400562
563 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300564}
Avi Kivity75858a82009-01-04 17:10:50 +0200565
Wei Yongjun72bb2fc2010-02-09 10:33:03 +0800566void kvm_ioapic_destroy(struct kvm *kvm)
567{
568 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
569
570 if (ioapic) {
571 kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev);
572 kvm->arch.vioapic = NULL;
573 kfree(ioapic);
574 }
575}
576
Gleb Natapoveba02262009-08-24 11:54:25 +0300577int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
578{
579 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
580 if (!ioapic)
581 return -EINVAL;
582
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300583 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300584 memcpy(state, ioapic, sizeof(struct kvm_ioapic_state));
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300585 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300586 return 0;
587}
588
589int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
590{
591 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
592 if (!ioapic)
593 return -EINVAL;
594
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300595 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300596 memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
Avi Kivity46a929b2009-12-28 14:08:30 +0200597 update_handled_vectors(ioapic);
Yang Zhang3d81bc72013-04-11 19:25:13 +0800598 kvm_vcpu_request_scan_ioapic(kvm);
Yang Zhang10606912013-04-11 19:21:38 +0800599 kvm_rtc_eoi_tracking_restore_all(ioapic);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300600 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300601 return 0;
602}