blob: ce9ed99ad7dcde1bd513161bebf741c6c417f83c [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];
206 if (!e->fields.mask &&
207 (e->fields.trig_mode == IOAPIC_LEVEL_TRIG ||
208 kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC,
Yang Zhangf3bff632013-04-11 19:21:39 +0800209 index) || index == RTC_GSI)) {
Yang Zhang44944d42013-04-07 08:25:18 +0800210 if (kvm_apic_match_dest(vcpu, NULL, 0,
Yang Zhangcf9e65b2013-04-11 19:25:14 +0800211 e->fields.dest_id, e->fields.dest_mode)) {
212 __set_bit(e->fields.vector,
213 (unsigned long *)eoi_exit_bitmap);
214 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG)
215 __set_bit(e->fields.vector,
216 (unsigned long *)tmr);
217 }
Yang Zhangc7c9c562013-01-25 10:18:51 +0800218 }
219 }
220 spin_unlock(&ioapic->lock);
221}
Yang Zhangc7c9c562013-01-25 10:18:51 +0800222
Yang Zhang3d81bc72013-04-11 19:25:13 +0800223#ifdef CONFIG_X86
224void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
Yang Zhangc7c9c562013-01-25 10:18:51 +0800225{
226 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
227
Yang Zhang3d81bc72013-04-11 19:25:13 +0800228 if (!ioapic)
Yang Zhangc7c9c562013-01-25 10:18:51 +0800229 return;
Yang Zhang3d81bc72013-04-11 19:25:13 +0800230 kvm_make_scan_ioapic_request(kvm);
Yang Zhangc7c9c562013-01-25 10:18:51 +0800231}
Yang Zhang3d81bc72013-04-11 19:25:13 +0800232#else
233void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
234{
235 return;
236}
237#endif
Yang Zhangc7c9c562013-01-25 10:18:51 +0800238
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300239static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
240{
241 unsigned index;
Avi Kivity75858a82009-01-04 17:10:50 +0200242 bool mask_before, mask_after;
Gleb Natapov70f93da2009-07-05 18:48:12 +0300243 union kvm_ioapic_redirect_entry *e;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300244
245 switch (ioapic->ioregsel) {
246 case IOAPIC_REG_VERSION:
247 /* Writes are ignored. */
248 break;
249
250 case IOAPIC_REG_APIC_ID:
251 ioapic->id = (val >> 24) & 0xf;
252 break;
253
254 case IOAPIC_REG_ARB_ID:
255 break;
256
257 default:
258 index = (ioapic->ioregsel - 0x10) >> 1;
259
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200260 ioapic_debug("change redir index %x val %x\n", index, val);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300261 if (index >= IOAPIC_NUM_PINS)
262 return;
Gleb Natapov70f93da2009-07-05 18:48:12 +0300263 e = &ioapic->redirtbl[index];
264 mask_before = e->fields.mask;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300265 if (ioapic->ioregsel & 1) {
Gleb Natapov70f93da2009-07-05 18:48:12 +0300266 e->bits &= 0xffffffff;
267 e->bits |= (u64) val << 32;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300268 } else {
Gleb Natapov70f93da2009-07-05 18:48:12 +0300269 e->bits &= ~0xffffffffULL;
270 e->bits |= (u32) val;
271 e->fields.remote_irr = 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300272 }
Avi Kivity46a929b2009-12-28 14:08:30 +0200273 update_handled_vectors(ioapic);
Gleb Natapov70f93da2009-07-05 18:48:12 +0300274 mask_after = e->fields.mask;
Avi Kivity75858a82009-01-04 17:10:50 +0200275 if (mask_before != mask_after)
Gleb Natapov4a994352010-07-11 15:32:23 +0300276 kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after);
Gleb Natapov70f93da2009-07-05 18:48:12 +0300277 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG
Gleb Natapovb4a2f5e2009-07-05 18:48:11 +0300278 && ioapic->irr & (1 << index))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800279 ioapic_service(ioapic, index, false);
Yang Zhang3d81bc72013-04-11 19:25:13 +0800280 kvm_vcpu_request_scan_ioapic(ioapic->kvm);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300281 break;
282 }
283}
284
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800285static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq, bool line_status)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300286{
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200287 union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
288 struct kvm_lapic_irq irqe;
Yang Zhang2c2bf012013-04-11 19:21:41 +0800289 int ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300290
291 ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200292 "vector=%x trig_mode=%x\n",
Liu Yuana38f84c2011-04-21 14:53:57 +0800293 entry->fields.dest_id, entry->fields.dest_mode,
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200294 entry->fields.delivery_mode, entry->fields.vector,
295 entry->fields.trig_mode);
296
297 irqe.dest_id = entry->fields.dest_id;
298 irqe.vector = entry->fields.vector;
299 irqe.dest_mode = entry->fields.dest_mode;
300 irqe.trig_mode = entry->fields.trig_mode;
301 irqe.delivery_mode = entry->fields.delivery_mode << 8;
302 irqe.level = 1;
303 irqe.shorthand = 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300304
Yang Zhang2c2bf012013-04-11 19:21:41 +0800305 if (irq == RTC_GSI && line_status) {
306 BUG_ON(ioapic->rtc_status.pending_eoi != 0);
307 ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe,
308 ioapic->rtc_status.dest_map);
309 ioapic->rtc_status.pending_eoi = ret;
310 } else
311 ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL);
312
313 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300314}
315
Michael S. Tsirkin1a577b72012-07-19 13:45:20 +0300316int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800317 int level, bool line_status)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300318{
Marcelo Tosatti07dc7262010-06-02 11:26:26 -0300319 u32 old_irr;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300320 u32 mask = 1 << irq;
Sheng Yangcf9e4e12009-02-11 16:03:36 +0800321 union kvm_ioapic_redirect_entry entry;
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300322 int ret, irq_level;
323
324 BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300325
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300326 spin_lock(&ioapic->lock);
Marcelo Tosatti07dc7262010-06-02 11:26:26 -0300327 old_irr = ioapic->irr;
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300328 irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],
329 irq_source_id, level);
330 entry = ioapic->redirtbl[irq];
331 irq_level ^= entry.fields.polarity;
332 if (!irq_level) {
333 ioapic->irr &= ~mask;
334 ret = 1;
335 } else {
336 int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
Yang Zhang2c2bf012013-04-11 19:21:41 +0800337
338 if (irq == RTC_GSI && line_status &&
339 rtc_irq_check_coalesced(ioapic)) {
340 ret = 0; /* coalesced */
341 goto out;
342 }
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300343 ioapic->irr |= mask;
344 if ((edge && old_irr != ioapic->irr) ||
345 (!edge && !entry.fields.remote_irr))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800346 ret = ioapic_service(ioapic, irq, line_status);
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300347 else
348 ret = 0; /* report coalesced interrupt */
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300349 }
Yang Zhang2c2bf012013-04-11 19:21:41 +0800350out:
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300351 trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300352 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300353
Gleb Natapov49256632009-02-04 17:28:14 +0200354 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300355}
356
Michael S. Tsirkin1a577b72012-07-19 13:45:20 +0300357void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id)
358{
359 int i;
360
361 spin_lock(&ioapic->lock);
362 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
363 __clear_bit(irq_source_id, &ioapic->irq_states[i]);
364 spin_unlock(&ioapic->lock);
365}
366
Yang Zhang1fcc7892013-04-11 19:21:35 +0800367static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu,
368 struct kvm_ioapic *ioapic, int vector, int trigger_mode)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300369{
Gleb Natapoveba02262009-08-24 11:54:25 +0300370 int i;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300371
Gleb Natapoveba02262009-08-24 11:54:25 +0300372 for (i = 0; i < IOAPIC_NUM_PINS; i++) {
373 union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300374
Gleb Natapoveba02262009-08-24 11:54:25 +0300375 if (ent->fields.vector != vector)
376 continue;
Marcelo Tosattif5244722008-07-26 17:01:00 -0300377
Yang Zhang2c2bf012013-04-11 19:21:41 +0800378 if (i == RTC_GSI)
379 rtc_irq_eoi(ioapic, vcpu);
Gleb Natapoveba02262009-08-24 11:54:25 +0300380 /*
381 * We are dropping lock while calling ack notifiers because ack
382 * notifier callbacks for assigned devices call into IOAPIC
383 * recursively. Since remote_irr is cleared only after call
384 * to notifiers if the same vector will be delivered while lock
385 * is dropped it will be put into irr and will be delivered
386 * after ack notifier returns.
387 */
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300388 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300389 kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300390 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300391
392 if (trigger_mode != IOAPIC_LEVEL_TRIG)
393 continue;
394
Marcelo Tosattif5244722008-07-26 17:01:00 -0300395 ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
396 ent->fields.remote_irr = 0;
Gleb Natapoveba02262009-08-24 11:54:25 +0300397 if (!ent->fields.mask && (ioapic->irr & (1 << i)))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800398 ioapic_service(ioapic, i, false);
Marcelo Tosattif5244722008-07-26 17:01:00 -0300399 }
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300400}
401
Michael S. Tsirkina0c9a8222012-04-11 18:49:55 +0300402bool kvm_ioapic_handles_vector(struct kvm *kvm, int vector)
403{
404 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
405 smp_rmb();
406 return test_bit(vector, ioapic->handled_vectors);
407}
408
Yang Zhang1fcc7892013-04-11 19:21:35 +0800409void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector, int trigger_mode)
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700410{
Yang Zhang1fcc7892013-04-11 19:21:35 +0800411 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700412
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300413 spin_lock(&ioapic->lock);
Yang Zhang1fcc7892013-04-11 19:21:35 +0800414 __kvm_ioapic_update_eoi(vcpu, ioapic, vector, trigger_mode);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300415 spin_unlock(&ioapic->lock);
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700416}
417
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400418static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
419{
420 return container_of(dev, struct kvm_ioapic, dev);
421}
422
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300423static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300424{
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300425 return ((addr >= ioapic->base_address &&
426 (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
427}
428
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300429static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
430 void *val)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300431{
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400432 struct kvm_ioapic *ioapic = to_ioapic(this);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300433 u32 result;
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300434 if (!ioapic_in_range(ioapic, addr))
435 return -EOPNOTSUPP;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300436
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200437 ioapic_debug("addr %lx\n", (unsigned long)addr);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300438 ASSERT(!(addr & 0xf)); /* check alignment */
439
440 addr &= 0xff;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300441 spin_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300442 switch (addr) {
443 case IOAPIC_REG_SELECT:
444 result = ioapic->ioregsel;
445 break;
446
447 case IOAPIC_REG_WINDOW:
448 result = ioapic_read_indirect(ioapic, addr, len);
449 break;
450
451 default:
452 result = 0;
453 break;
454 }
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300455 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300456
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300457 switch (len) {
458 case 8:
459 *(u64 *) val = result;
460 break;
461 case 1:
462 case 2:
463 case 4:
464 memcpy(val, (char *)&result, len);
465 break;
466 default:
467 printk(KERN_WARNING "ioapic: wrong length %d\n", len);
468 }
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300469 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300470}
471
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300472static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
473 const void *val)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300474{
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400475 struct kvm_ioapic *ioapic = to_ioapic(this);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300476 u32 data;
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300477 if (!ioapic_in_range(ioapic, addr))
478 return -EOPNOTSUPP;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300479
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200480 ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
481 (void*)addr, len, val);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300482 ASSERT(!(addr & 0xf)); /* check alignment */
Marcelo Tosatti60eead72009-06-04 15:08:23 -0300483
Julian Stecklinad77fe632011-11-23 13:54:30 +0100484 switch (len) {
485 case 8:
486 case 4:
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300487 data = *(u32 *) val;
Julian Stecklinad77fe632011-11-23 13:54:30 +0100488 break;
489 case 2:
490 data = *(u16 *) val;
491 break;
492 case 1:
493 data = *(u8 *) val;
494 break;
495 default:
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300496 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
Gleb Natapoveba02262009-08-24 11:54:25 +0300497 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300498 }
499
500 addr &= 0xff;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300501 spin_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300502 switch (addr) {
503 case IOAPIC_REG_SELECT:
Julian Stecklinad77fe632011-11-23 13:54:30 +0100504 ioapic->ioregsel = data & 0xFF; /* 8-bit register */
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300505 break;
506
507 case IOAPIC_REG_WINDOW:
508 ioapic_write_indirect(ioapic, data);
509 break;
Zhang Xiantaob1fd3d32007-12-02 22:53:07 +0800510#ifdef CONFIG_IA64
511 case IOAPIC_REG_EOI:
Yang Zhang1fcc7892013-04-11 19:21:35 +0800512 __kvm_ioapic_update_eoi(NULL, ioapic, data, IOAPIC_LEVEL_TRIG);
Zhang Xiantaob1fd3d32007-12-02 22:53:07 +0800513 break;
514#endif
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300515
516 default:
517 break;
518 }
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300519 spin_unlock(&ioapic->lock);
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300520 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300521}
522
Stephen Hemminger79408762013-12-29 12:12:29 -0800523static void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
Eddie Dong8c392692007-10-10 12:15:54 +0200524{
525 int i;
526
527 for (i = 0; i < IOAPIC_NUM_PINS; i++)
528 ioapic->redirtbl[i].fields.mask = 1;
529 ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
530 ioapic->ioregsel = 0;
531 ioapic->irr = 0;
532 ioapic->id = 0;
Yang Zhang10606912013-04-11 19:21:38 +0800533 rtc_irq_eoi_tracking_reset(ioapic);
Avi Kivity46a929b2009-12-28 14:08:30 +0200534 update_handled_vectors(ioapic);
Eddie Dong8c392692007-10-10 12:15:54 +0200535}
536
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400537static const struct kvm_io_device_ops ioapic_mmio_ops = {
538 .read = ioapic_mmio_read,
539 .write = ioapic_mmio_write,
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400540};
541
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300542int kvm_ioapic_init(struct kvm *kvm)
543{
544 struct kvm_ioapic *ioapic;
Gregory Haskins090b7af2009-07-07 17:08:44 -0400545 int ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300546
547 ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
548 if (!ioapic)
549 return -ENOMEM;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300550 spin_lock_init(&ioapic->lock);
Zhang Xiantaod7deeeb02007-12-14 10:17:34 +0800551 kvm->arch.vioapic = ioapic;
Eddie Dong8c392692007-10-10 12:15:54 +0200552 kvm_ioapic_reset(ioapic);
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400553 kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300554 ioapic->kvm = kvm;
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200555 mutex_lock(&kvm->slots_lock);
Sasha Levin743eeb02011-07-27 16:00:48 +0300556 ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, ioapic->base_address,
557 IOAPIC_MEM_LENGTH, &ioapic->dev);
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200558 mutex_unlock(&kvm->slots_lock);
Wei Yongjun1ae77ba2010-02-09 10:31:09 +0800559 if (ret < 0) {
560 kvm->arch.vioapic = NULL;
Gregory Haskins090b7af2009-07-07 17:08:44 -0400561 kfree(ioapic);
Wei Yongjun1ae77ba2010-02-09 10:31:09 +0800562 }
Gregory Haskins090b7af2009-07-07 17:08:44 -0400563
564 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300565}
Avi Kivity75858a82009-01-04 17:10:50 +0200566
Wei Yongjun72bb2fc2010-02-09 10:33:03 +0800567void kvm_ioapic_destroy(struct kvm *kvm)
568{
569 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
570
571 if (ioapic) {
572 kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev);
573 kvm->arch.vioapic = NULL;
574 kfree(ioapic);
575 }
576}
577
Gleb Natapoveba02262009-08-24 11:54:25 +0300578int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
579{
580 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
581 if (!ioapic)
582 return -EINVAL;
583
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300584 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300585 memcpy(state, ioapic, sizeof(struct kvm_ioapic_state));
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300586 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300587 return 0;
588}
589
590int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
591{
592 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
593 if (!ioapic)
594 return -EINVAL;
595
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300596 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300597 memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
Avi Kivity46a929b2009-12-28 14:08:30 +0200598 update_handled_vectors(ioapic);
Yang Zhang3d81bc72013-04-11 19:25:13 +0800599 kvm_vcpu_request_scan_ioapic(kvm);
Yang Zhang10606912013-04-11 19:21:38 +0800600 kvm_rtc_eoi_tracking_restore_all(ioapic);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300601 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300602 return 0;
603}