blob: 2458a1dc2ba9f2a84491eca30542b3b247482f27 [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
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
Paolo Bonzini4009b242014-03-28 20:41:51 +0100100static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic);
101
102static 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
Yang Zhang10606912013-04-11 19:21:38 +0800108static 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--;
Paolo Bonzini4009b242014-03-28 20:41:51 +0100131 rtc_status_pending_eoi_check_valid(ioapic);
Yang Zhang10606912013-04-11 19:21:38 +0800132 }
Yang Zhang10606912013-04-11 19:21:38 +0800133}
134
135void 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
144static 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
Yang Zhang2c2bf012013-04-11 19:21:41 +0800157static void rtc_irq_eoi(struct kvm_ioapic *ioapic, struct kvm_vcpu *vcpu)
158{
Paolo Bonzini4009b242014-03-28 20:41:51 +0100159 if (test_and_clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map)) {
Yang Zhang2c2bf012013-04-11 19:21:41 +0800160 --ioapic->rtc_status.pending_eoi;
Paolo Bonzini4009b242014-03-28 20:41:51 +0100161 rtc_status_pending_eoi_check_valid(ioapic);
162 }
Yang Zhang2c2bf012013-04-11 19:21:41 +0800163}
164
165static 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
Paolo Bonzini44847de2014-03-18 12:00:14 +0100173static 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;
209 if ((edge && old_irr == ioapic->irr) ||
210 (!edge && entry.fields.remote_irr)) {
211 ret = 0;
212 goto out;
213 }
214
215 ret = ioapic_service(ioapic, irq, line_status);
216
217out:
218 trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
219 return ret;
220}
221
Paolo Bonzini673f7b42014-03-18 11:39:23 +0100222static void kvm_ioapic_inject_all(struct kvm_ioapic *ioapic, unsigned long irr)
223{
224 u32 idx;
225
226 rtc_irq_eoi_tracking_reset(ioapic);
227 for_each_set_bit(idx, &irr, IOAPIC_NUM_PINS)
228 ioapic_set_irq(ioapic, idx, 1, true);
229
230 kvm_rtc_eoi_tracking_restore_all(ioapic);
231}
232
233
Avi Kivity46a929b2009-12-28 14:08:30 +0200234static void update_handled_vectors(struct kvm_ioapic *ioapic)
235{
236 DECLARE_BITMAP(handled_vectors, 256);
237 int i;
238
239 memset(handled_vectors, 0, sizeof(handled_vectors));
240 for (i = 0; i < IOAPIC_NUM_PINS; ++i)
241 __set_bit(ioapic->redirtbl[i].fields.vector, handled_vectors);
242 memcpy(ioapic->handled_vectors, handled_vectors,
243 sizeof(handled_vectors));
244 smp_wmb();
245}
246
Yang Zhangcf9e65b2013-04-11 19:25:14 +0800247void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap,
248 u32 *tmr)
Yang Zhangc7c9c562013-01-25 10:18:51 +0800249{
250 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
251 union kvm_ioapic_redirect_entry *e;
Yang Zhangc7c9c562013-01-25 10:18:51 +0800252 int index;
253
254 spin_lock(&ioapic->lock);
Yang Zhangc7c9c562013-01-25 10:18:51 +0800255 for (index = 0; index < IOAPIC_NUM_PINS; index++) {
256 e = &ioapic->redirtbl[index];
257 if (!e->fields.mask &&
258 (e->fields.trig_mode == IOAPIC_LEVEL_TRIG ||
259 kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC,
Yang Zhangf3bff632013-04-11 19:21:39 +0800260 index) || index == RTC_GSI)) {
Yang Zhang44944d42013-04-07 08:25:18 +0800261 if (kvm_apic_match_dest(vcpu, NULL, 0,
Yang Zhangcf9e65b2013-04-11 19:25:14 +0800262 e->fields.dest_id, e->fields.dest_mode)) {
263 __set_bit(e->fields.vector,
264 (unsigned long *)eoi_exit_bitmap);
265 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG)
266 __set_bit(e->fields.vector,
267 (unsigned long *)tmr);
268 }
Yang Zhangc7c9c562013-01-25 10:18:51 +0800269 }
270 }
271 spin_unlock(&ioapic->lock);
272}
Yang Zhangc7c9c562013-01-25 10:18:51 +0800273
Yang Zhang3d81bc72013-04-11 19:25:13 +0800274#ifdef CONFIG_X86
275void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
Yang Zhangc7c9c562013-01-25 10:18:51 +0800276{
277 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
278
Yang Zhang3d81bc72013-04-11 19:25:13 +0800279 if (!ioapic)
Yang Zhangc7c9c562013-01-25 10:18:51 +0800280 return;
Yang Zhang3d81bc72013-04-11 19:25:13 +0800281 kvm_make_scan_ioapic_request(kvm);
Yang Zhangc7c9c562013-01-25 10:18:51 +0800282}
Yang Zhang3d81bc72013-04-11 19:25:13 +0800283#else
284void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
285{
286 return;
287}
288#endif
Yang Zhangc7c9c562013-01-25 10:18:51 +0800289
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300290static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
291{
292 unsigned index;
Avi Kivity75858a82009-01-04 17:10:50 +0200293 bool mask_before, mask_after;
Gleb Natapov70f93da2009-07-05 18:48:12 +0300294 union kvm_ioapic_redirect_entry *e;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300295
296 switch (ioapic->ioregsel) {
297 case IOAPIC_REG_VERSION:
298 /* Writes are ignored. */
299 break;
300
301 case IOAPIC_REG_APIC_ID:
302 ioapic->id = (val >> 24) & 0xf;
303 break;
304
305 case IOAPIC_REG_ARB_ID:
306 break;
307
308 default:
309 index = (ioapic->ioregsel - 0x10) >> 1;
310
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200311 ioapic_debug("change redir index %x val %x\n", index, val);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300312 if (index >= IOAPIC_NUM_PINS)
313 return;
Gleb Natapov70f93da2009-07-05 18:48:12 +0300314 e = &ioapic->redirtbl[index];
315 mask_before = e->fields.mask;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300316 if (ioapic->ioregsel & 1) {
Gleb Natapov70f93da2009-07-05 18:48:12 +0300317 e->bits &= 0xffffffff;
318 e->bits |= (u64) val << 32;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300319 } else {
Gleb Natapov70f93da2009-07-05 18:48:12 +0300320 e->bits &= ~0xffffffffULL;
321 e->bits |= (u32) val;
322 e->fields.remote_irr = 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300323 }
Avi Kivity46a929b2009-12-28 14:08:30 +0200324 update_handled_vectors(ioapic);
Gleb Natapov70f93da2009-07-05 18:48:12 +0300325 mask_after = e->fields.mask;
Avi Kivity75858a82009-01-04 17:10:50 +0200326 if (mask_before != mask_after)
Gleb Natapov4a994352010-07-11 15:32:23 +0300327 kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after);
Gleb Natapov70f93da2009-07-05 18:48:12 +0300328 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG
Gleb Natapovb4a2f5e2009-07-05 18:48:11 +0300329 && ioapic->irr & (1 << index))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800330 ioapic_service(ioapic, index, false);
Yang Zhang3d81bc72013-04-11 19:25:13 +0800331 kvm_vcpu_request_scan_ioapic(ioapic->kvm);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300332 break;
333 }
334}
335
Paolo Bonzini0b10a1c2014-03-18 11:51:29 +0100336static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300337{
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200338 union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
339 struct kvm_lapic_irq irqe;
Yang Zhang2c2bf012013-04-11 19:21:41 +0800340 int ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300341
Paolo Bonzini0b10a1c2014-03-18 11:51:29 +0100342 if (entry->fields.mask)
343 return -1;
344
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300345 ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200346 "vector=%x trig_mode=%x\n",
Liu Yuana38f84c2011-04-21 14:53:57 +0800347 entry->fields.dest_id, entry->fields.dest_mode,
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200348 entry->fields.delivery_mode, entry->fields.vector,
349 entry->fields.trig_mode);
350
351 irqe.dest_id = entry->fields.dest_id;
352 irqe.vector = entry->fields.vector;
353 irqe.dest_mode = entry->fields.dest_mode;
354 irqe.trig_mode = entry->fields.trig_mode;
355 irqe.delivery_mode = entry->fields.delivery_mode << 8;
356 irqe.level = 1;
357 irqe.shorthand = 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300358
Paolo Bonzini0bc830b2014-03-18 10:47:17 +0100359 if (irqe.trig_mode == IOAPIC_EDGE_TRIG)
360 ioapic->irr &= ~(1 << irq);
361
Yang Zhang2c2bf012013-04-11 19:21:41 +0800362 if (irq == RTC_GSI && line_status) {
Paolo Bonzini4009b242014-03-28 20:41:51 +0100363 /*
364 * pending_eoi cannot ever become negative (see
365 * rtc_status_pending_eoi_check_valid) and the caller
366 * ensures that it is only called if it is >= zero, namely
367 * if rtc_irq_check_coalesced returns false).
368 */
Yang Zhang2c2bf012013-04-11 19:21:41 +0800369 BUG_ON(ioapic->rtc_status.pending_eoi != 0);
370 ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe,
371 ioapic->rtc_status.dest_map);
Paolo Bonzini5678de3f2014-03-28 20:41:50 +0100372 ioapic->rtc_status.pending_eoi = (ret < 0 ? 0 : ret);
Yang Zhang2c2bf012013-04-11 19:21:41 +0800373 } else
374 ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL);
375
Paolo Bonzini0b10a1c2014-03-18 11:51:29 +0100376 if (ret && irqe.trig_mode == IOAPIC_LEVEL_TRIG)
377 entry->fields.remote_irr = 1;
378
Yang Zhang2c2bf012013-04-11 19:21:41 +0800379 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300380}
381
Michael S. Tsirkin1a577b72012-07-19 13:45:20 +0300382int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800383 int level, bool line_status)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300384{
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300385 int ret, irq_level;
386
387 BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300388
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300389 spin_lock(&ioapic->lock);
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300390 irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],
391 irq_source_id, level);
Paolo Bonzini44847de2014-03-18 12:00:14 +0100392 ret = ioapic_set_irq(ioapic, irq, irq_level, line_status);
Yang Zhang2c2bf012013-04-11 19:21:41 +0800393
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300394 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300395
Gleb Natapov49256632009-02-04 17:28:14 +0200396 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300397}
398
Michael S. Tsirkin1a577b72012-07-19 13:45:20 +0300399void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id)
400{
401 int i;
402
403 spin_lock(&ioapic->lock);
404 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
405 __clear_bit(irq_source_id, &ioapic->irq_states[i]);
406 spin_unlock(&ioapic->lock);
407}
408
Yang Zhang1fcc7892013-04-11 19:21:35 +0800409static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu,
410 struct kvm_ioapic *ioapic, int vector, int trigger_mode)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300411{
Gleb Natapoveba02262009-08-24 11:54:25 +0300412 int i;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300413
Gleb Natapoveba02262009-08-24 11:54:25 +0300414 for (i = 0; i < IOAPIC_NUM_PINS; i++) {
415 union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300416
Gleb Natapoveba02262009-08-24 11:54:25 +0300417 if (ent->fields.vector != vector)
418 continue;
Marcelo Tosattif5244722008-07-26 17:01:00 -0300419
Yang Zhang2c2bf012013-04-11 19:21:41 +0800420 if (i == RTC_GSI)
421 rtc_irq_eoi(ioapic, vcpu);
Gleb Natapoveba02262009-08-24 11:54:25 +0300422 /*
423 * We are dropping lock while calling ack notifiers because ack
424 * notifier callbacks for assigned devices call into IOAPIC
425 * recursively. Since remote_irr is cleared only after call
426 * to notifiers if the same vector will be delivered while lock
427 * is dropped it will be put into irr and will be delivered
428 * after ack notifier returns.
429 */
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300430 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300431 kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300432 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300433
434 if (trigger_mode != IOAPIC_LEVEL_TRIG)
435 continue;
436
Marcelo Tosattif5244722008-07-26 17:01:00 -0300437 ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
438 ent->fields.remote_irr = 0;
Paolo Bonzini0b10a1c2014-03-18 11:51:29 +0100439 if (ioapic->irr & (1 << i))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800440 ioapic_service(ioapic, i, false);
Marcelo Tosattif5244722008-07-26 17:01:00 -0300441 }
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300442}
443
Michael S. Tsirkina0c9a822012-04-11 18:49:55 +0300444bool kvm_ioapic_handles_vector(struct kvm *kvm, int vector)
445{
446 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
447 smp_rmb();
448 return test_bit(vector, ioapic->handled_vectors);
449}
450
Yang Zhang1fcc7892013-04-11 19:21:35 +0800451void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector, int trigger_mode)
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700452{
Yang Zhang1fcc7892013-04-11 19:21:35 +0800453 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700454
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300455 spin_lock(&ioapic->lock);
Yang Zhang1fcc7892013-04-11 19:21:35 +0800456 __kvm_ioapic_update_eoi(vcpu, ioapic, vector, trigger_mode);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300457 spin_unlock(&ioapic->lock);
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700458}
459
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400460static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
461{
462 return container_of(dev, struct kvm_ioapic, dev);
463}
464
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300465static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300466{
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300467 return ((addr >= ioapic->base_address &&
468 (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
469}
470
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300471static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
472 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 result;
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("addr %lx\n", (unsigned long)addr);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300480 ASSERT(!(addr & 0xf)); /* check alignment */
481
482 addr &= 0xff;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300483 spin_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300484 switch (addr) {
485 case IOAPIC_REG_SELECT:
486 result = ioapic->ioregsel;
487 break;
488
489 case IOAPIC_REG_WINDOW:
490 result = ioapic_read_indirect(ioapic, addr, len);
491 break;
492
493 default:
494 result = 0;
495 break;
496 }
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300497 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300498
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300499 switch (len) {
500 case 8:
501 *(u64 *) val = result;
502 break;
503 case 1:
504 case 2:
505 case 4:
506 memcpy(val, (char *)&result, len);
507 break;
508 default:
509 printk(KERN_WARNING "ioapic: wrong length %d\n", len);
510 }
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300511 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300512}
513
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300514static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
515 const void *val)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300516{
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400517 struct kvm_ioapic *ioapic = to_ioapic(this);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300518 u32 data;
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300519 if (!ioapic_in_range(ioapic, addr))
520 return -EOPNOTSUPP;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300521
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200522 ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
523 (void*)addr, len, val);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300524 ASSERT(!(addr & 0xf)); /* check alignment */
Marcelo Tosatti60eead72009-06-04 15:08:23 -0300525
Julian Stecklinad77fe632011-11-23 13:54:30 +0100526 switch (len) {
527 case 8:
528 case 4:
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300529 data = *(u32 *) val;
Julian Stecklinad77fe632011-11-23 13:54:30 +0100530 break;
531 case 2:
532 data = *(u16 *) val;
533 break;
534 case 1:
535 data = *(u8 *) val;
536 break;
537 default:
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300538 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
Gleb Natapoveba02262009-08-24 11:54:25 +0300539 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300540 }
541
542 addr &= 0xff;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300543 spin_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300544 switch (addr) {
545 case IOAPIC_REG_SELECT:
Julian Stecklinad77fe632011-11-23 13:54:30 +0100546 ioapic->ioregsel = data & 0xFF; /* 8-bit register */
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300547 break;
548
549 case IOAPIC_REG_WINDOW:
550 ioapic_write_indirect(ioapic, data);
551 break;
Zhang Xiantaob1fd3d32007-12-02 22:53:07 +0800552#ifdef CONFIG_IA64
553 case IOAPIC_REG_EOI:
Yang Zhang1fcc7892013-04-11 19:21:35 +0800554 __kvm_ioapic_update_eoi(NULL, ioapic, data, IOAPIC_LEVEL_TRIG);
Zhang Xiantaob1fd3d32007-12-02 22:53:07 +0800555 break;
556#endif
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300557
558 default:
559 break;
560 }
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300561 spin_unlock(&ioapic->lock);
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300562 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300563}
564
Stephen Hemminger79408762013-12-29 12:12:29 -0800565static void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
Eddie Dong8c392692007-10-10 12:15:54 +0200566{
567 int i;
568
569 for (i = 0; i < IOAPIC_NUM_PINS; i++)
570 ioapic->redirtbl[i].fields.mask = 1;
571 ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
572 ioapic->ioregsel = 0;
573 ioapic->irr = 0;
574 ioapic->id = 0;
Yang Zhang10606912013-04-11 19:21:38 +0800575 rtc_irq_eoi_tracking_reset(ioapic);
Avi Kivity46a929b2009-12-28 14:08:30 +0200576 update_handled_vectors(ioapic);
Eddie Dong8c392692007-10-10 12:15:54 +0200577}
578
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400579static const struct kvm_io_device_ops ioapic_mmio_ops = {
580 .read = ioapic_mmio_read,
581 .write = ioapic_mmio_write,
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400582};
583
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300584int kvm_ioapic_init(struct kvm *kvm)
585{
586 struct kvm_ioapic *ioapic;
Gregory Haskins090b7af2009-07-07 17:08:44 -0400587 int ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300588
589 ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
590 if (!ioapic)
591 return -ENOMEM;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300592 spin_lock_init(&ioapic->lock);
Zhang Xiantaod7deeeb02007-12-14 10:17:34 +0800593 kvm->arch.vioapic = ioapic;
Eddie Dong8c392692007-10-10 12:15:54 +0200594 kvm_ioapic_reset(ioapic);
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400595 kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300596 ioapic->kvm = kvm;
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200597 mutex_lock(&kvm->slots_lock);
Sasha Levin743eeb02011-07-27 16:00:48 +0300598 ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, ioapic->base_address,
599 IOAPIC_MEM_LENGTH, &ioapic->dev);
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200600 mutex_unlock(&kvm->slots_lock);
Wei Yongjun1ae77ba2010-02-09 10:31:09 +0800601 if (ret < 0) {
602 kvm->arch.vioapic = NULL;
Gregory Haskins090b7af2009-07-07 17:08:44 -0400603 kfree(ioapic);
Wei Yongjun1ae77ba2010-02-09 10:31:09 +0800604 }
Gregory Haskins090b7af2009-07-07 17:08:44 -0400605
606 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300607}
Avi Kivity75858a82009-01-04 17:10:50 +0200608
Wei Yongjun72bb2fc2010-02-09 10:33:03 +0800609void kvm_ioapic_destroy(struct kvm *kvm)
610{
611 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
612
613 if (ioapic) {
614 kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev);
615 kvm->arch.vioapic = NULL;
616 kfree(ioapic);
617 }
618}
619
Gleb Natapoveba02262009-08-24 11:54:25 +0300620int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
621{
622 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
623 if (!ioapic)
624 return -EINVAL;
625
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300626 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300627 memcpy(state, ioapic, sizeof(struct kvm_ioapic_state));
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300628 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300629 return 0;
630}
631
632int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
633{
634 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
635 if (!ioapic)
636 return -EINVAL;
637
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300638 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300639 memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
Paolo Bonzini673f7b42014-03-18 11:39:23 +0100640 ioapic->irr = 0;
Avi Kivity46a929b2009-12-28 14:08:30 +0200641 update_handled_vectors(ioapic);
Yang Zhang3d81bc72013-04-11 19:25:13 +0800642 kvm_vcpu_request_scan_ioapic(kvm);
Paolo Bonzini673f7b42014-03-18 11:39:23 +0100643 kvm_ioapic_inject_all(ioapic, state->irr);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300644 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300645 return 0;
646}