blob: 38a2d20b89de93b4b6deb7f4de2850906de17243 [file] [log] [blame]
Eddie Dong1fd4f2a2007-07-18 12:03:39 +03001/*
2 * Copyright (C) 2001 MandrakeSoft S.A.
3 *
4 * MandrakeSoft S.A.
5 * 43, rue d'Aboukir
6 * 75002 Paris - France
7 * http://www.linux-mandrake.com/
8 * http://www.mandrakesoft.com/
9 *
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 * Yunhong Jiang <yunhong.jiang@intel.com>
25 * Yaozu (Eddie) Dong <eddie.dong@intel.com>
26 * Based on Xen 3.1 code.
27 */
28
Avi Kivityedf88412007-12-16 11:02:48 +020029#include <linux/kvm_host.h>
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030030#include <linux/kvm.h>
31#include <linux/mm.h>
32#include <linux/highmem.h>
33#include <linux/smp.h>
34#include <linux/hrtimer.h>
35#include <linux/io.h>
36#include <asm/processor.h>
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030037#include <asm/page.h>
38#include <asm/current.h>
Gleb Natapov1000ff82009-07-07 16:00:57 +030039#include <trace/events/kvm.h>
Zhang Xiantao82470192007-12-17 13:59:56 +080040
41#include "ioapic.h"
42#include "lapic.h"
Marcelo Tosattif5244722008-07-26 17:01:00 -030043#include "irq.h"
Zhang Xiantao82470192007-12-17 13:59:56 +080044
Laurent Viviere25e3ed2007-10-12 11:01:59 +020045#if 0
46#define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg)
47#else
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030048#define ioapic_debug(fmt, arg...)
Laurent Viviere25e3ed2007-10-12 11:01:59 +020049#endif
Marcelo Tosattiff4b9df2008-06-05 00:08:11 -030050static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030051
52static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
53 unsigned long addr,
54 unsigned long length)
55{
56 unsigned long result = 0;
57
58 switch (ioapic->ioregsel) {
59 case IOAPIC_REG_VERSION:
60 result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16)
61 | (IOAPIC_VERSION_ID & 0xff));
62 break;
63
64 case IOAPIC_REG_APIC_ID:
65 case IOAPIC_REG_ARB_ID:
66 result = ((ioapic->id & 0xf) << 24);
67 break;
68
69 default:
70 {
71 u32 redir_index = (ioapic->ioregsel - 0x10) >> 1;
72 u64 redir_content;
73
74 ASSERT(redir_index < IOAPIC_NUM_PINS);
75
76 redir_content = ioapic->redirtbl[redir_index].bits;
77 result = (ioapic->ioregsel & 0x1) ?
78 (redir_content >> 32) & 0xffffffff :
79 redir_content & 0xffffffff;
80 break;
81 }
82 }
83
84 return result;
85}
86
Gleb Natapov49256632009-02-04 17:28:14 +020087static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030088{
Sheng Yangcf9e4e12009-02-11 16:03:36 +080089 union kvm_ioapic_redirect_entry *pent;
Gleb Natapov49256632009-02-04 17:28:14 +020090 int injected = -1;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030091
92 pent = &ioapic->redirtbl[idx];
93
94 if (!pent->fields.mask) {
Gleb Natapov49256632009-02-04 17:28:14 +020095 injected = ioapic_deliver(ioapic, idx);
Marcelo Tosattiff4b9df2008-06-05 00:08:11 -030096 if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030097 pent->fields.remote_irr = 1;
98 }
Gleb Natapov49256632009-02-04 17:28:14 +020099
100 return injected;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300101}
102
103static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
104{
105 unsigned index;
Avi Kivity75858a82009-01-04 17:10:50 +0200106 bool mask_before, mask_after;
Gleb Natapov70f93da2009-07-05 18:48:12 +0300107 union kvm_ioapic_redirect_entry *e;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300108
109 switch (ioapic->ioregsel) {
110 case IOAPIC_REG_VERSION:
111 /* Writes are ignored. */
112 break;
113
114 case IOAPIC_REG_APIC_ID:
115 ioapic->id = (val >> 24) & 0xf;
116 break;
117
118 case IOAPIC_REG_ARB_ID:
119 break;
120
121 default:
122 index = (ioapic->ioregsel - 0x10) >> 1;
123
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200124 ioapic_debug("change redir index %x val %x\n", index, val);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300125 if (index >= IOAPIC_NUM_PINS)
126 return;
Gleb Natapov70f93da2009-07-05 18:48:12 +0300127 e = &ioapic->redirtbl[index];
128 mask_before = e->fields.mask;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300129 if (ioapic->ioregsel & 1) {
Gleb Natapov70f93da2009-07-05 18:48:12 +0300130 e->bits &= 0xffffffff;
131 e->bits |= (u64) val << 32;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300132 } else {
Gleb Natapov70f93da2009-07-05 18:48:12 +0300133 e->bits &= ~0xffffffffULL;
134 e->bits |= (u32) val;
135 e->fields.remote_irr = 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300136 }
Gleb Natapov70f93da2009-07-05 18:48:12 +0300137 mask_after = e->fields.mask;
Avi Kivity75858a82009-01-04 17:10:50 +0200138 if (mask_before != mask_after)
139 kvm_fire_mask_notifiers(ioapic->kvm, index, mask_after);
Gleb Natapov70f93da2009-07-05 18:48:12 +0300140 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG
Gleb Natapovb4a2f5e2009-07-05 18:48:11 +0300141 && ioapic->irr & (1 << index))
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300142 ioapic_service(ioapic, index);
143 break;
144 }
145}
146
Marcelo Tosattiff4b9df2008-06-05 00:08:11 -0300147static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300148{
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200149 union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
150 struct kvm_lapic_irq irqe;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300151
152 ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200153 "vector=%x trig_mode=%x\n",
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200154 entry->fields.dest, entry->fields.dest_mode,
155 entry->fields.delivery_mode, entry->fields.vector,
156 entry->fields.trig_mode);
157
158 irqe.dest_id = entry->fields.dest_id;
159 irqe.vector = entry->fields.vector;
160 irqe.dest_mode = entry->fields.dest_mode;
161 irqe.trig_mode = entry->fields.trig_mode;
162 irqe.delivery_mode = entry->fields.delivery_mode << 8;
163 irqe.level = 1;
164 irqe.shorthand = 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300165
Avi Kivity8c35f232008-02-25 10:28:31 +0200166#ifdef CONFIG_X86
Gleb Natapova53c17d2009-03-05 16:34:49 +0200167 /* Always delivery PIT interrupt to vcpu 0 */
Sheng Yang74a3a8f2009-03-04 13:33:02 +0800168 if (irq == 0) {
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200169 irqe.dest_mode = 0; /* Physical mode. */
Gleb Natapovc5af89b2009-06-09 15:56:26 +0300170 /* need to read apic_id from apic regiest since
171 * it can be rewritten */
172 irqe.dest_id = ioapic->kvm->bsp_vcpu->vcpu_id;
Gleb Natapova53c17d2009-03-05 16:34:49 +0200173 }
Avi Kivity8c35f232008-02-25 10:28:31 +0200174#endif
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200175 return kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300176}
177
Gleb Natapov49256632009-02-04 17:28:14 +0200178int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300179{
180 u32 old_irr = ioapic->irr;
181 u32 mask = 1 << irq;
Sheng Yangcf9e4e12009-02-11 16:03:36 +0800182 union kvm_ioapic_redirect_entry entry;
Gleb Natapov49256632009-02-04 17:28:14 +0200183 int ret = 1;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300184
Gleb Natapoveba02262009-08-24 11:54:25 +0300185 mutex_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300186 if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
187 entry = ioapic->redirtbl[irq];
188 level ^= entry.fields.polarity;
189 if (!level)
190 ioapic->irr &= ~mask;
191 else {
Gleb Natapovb4a2f5e2009-07-05 18:48:11 +0300192 int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300193 ioapic->irr |= mask;
Gleb Natapovb4a2f5e2009-07-05 18:48:11 +0300194 if ((edge && old_irr != ioapic->irr) ||
195 (!edge && !entry.fields.remote_irr))
Gleb Natapov49256632009-02-04 17:28:14 +0200196 ret = ioapic_service(ioapic, irq);
Gleb Natapov65a82212009-09-03 12:10:34 +0300197 else
198 ret = 0; /* report coalesced interrupt */
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300199 }
Gleb Natapov1000ff82009-07-07 16:00:57 +0300200 trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300201 }
Gleb Natapoveba02262009-08-24 11:54:25 +0300202 mutex_unlock(&ioapic->lock);
203
Gleb Natapov49256632009-02-04 17:28:14 +0200204 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300205}
206
Gleb Natapoveba02262009-08-24 11:54:25 +0300207static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int vector,
208 int trigger_mode)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300209{
Gleb Natapoveba02262009-08-24 11:54:25 +0300210 int i;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300211
Gleb Natapoveba02262009-08-24 11:54:25 +0300212 for (i = 0; i < IOAPIC_NUM_PINS; i++) {
213 union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300214
Gleb Natapoveba02262009-08-24 11:54:25 +0300215 if (ent->fields.vector != vector)
216 continue;
Marcelo Tosattif5244722008-07-26 17:01:00 -0300217
Gleb Natapoveba02262009-08-24 11:54:25 +0300218 /*
219 * We are dropping lock while calling ack notifiers because ack
220 * notifier callbacks for assigned devices call into IOAPIC
221 * recursively. Since remote_irr is cleared only after call
222 * to notifiers if the same vector will be delivered while lock
223 * is dropped it will be put into irr and will be delivered
224 * after ack notifier returns.
225 */
226 mutex_unlock(&ioapic->lock);
227 kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i);
228 mutex_lock(&ioapic->lock);
229
230 if (trigger_mode != IOAPIC_LEVEL_TRIG)
231 continue;
232
Marcelo Tosattif5244722008-07-26 17:01:00 -0300233 ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
234 ent->fields.remote_irr = 0;
Gleb Natapoveba02262009-08-24 11:54:25 +0300235 if (!ent->fields.mask && (ioapic->irr & (1 << i)))
236 ioapic_service(ioapic, i);
Marcelo Tosattif5244722008-07-26 17:01:00 -0300237 }
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300238}
239
Marcelo Tosattif5244722008-07-26 17:01:00 -0300240void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700241{
242 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700243
Gleb Natapoveba02262009-08-24 11:54:25 +0300244 mutex_lock(&ioapic->lock);
245 __kvm_ioapic_update_eoi(ioapic, vector, trigger_mode);
246 mutex_unlock(&ioapic->lock);
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700247}
248
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400249static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
250{
251 return container_of(dev, struct kvm_ioapic, dev);
252}
253
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300254static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300255{
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300256 return ((addr >= ioapic->base_address &&
257 (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
258}
259
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300260static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
261 void *val)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300262{
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400263 struct kvm_ioapic *ioapic = to_ioapic(this);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300264 u32 result;
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300265 if (!ioapic_in_range(ioapic, addr))
266 return -EOPNOTSUPP;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300267
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200268 ioapic_debug("addr %lx\n", (unsigned long)addr);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300269 ASSERT(!(addr & 0xf)); /* check alignment */
270
271 addr &= 0xff;
Gleb Natapoveba02262009-08-24 11:54:25 +0300272 mutex_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300273 switch (addr) {
274 case IOAPIC_REG_SELECT:
275 result = ioapic->ioregsel;
276 break;
277
278 case IOAPIC_REG_WINDOW:
279 result = ioapic_read_indirect(ioapic, addr, len);
280 break;
281
282 default:
283 result = 0;
284 break;
285 }
Gleb Natapoveba02262009-08-24 11:54:25 +0300286 mutex_unlock(&ioapic->lock);
287
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300288 switch (len) {
289 case 8:
290 *(u64 *) val = result;
291 break;
292 case 1:
293 case 2:
294 case 4:
295 memcpy(val, (char *)&result, len);
296 break;
297 default:
298 printk(KERN_WARNING "ioapic: wrong length %d\n", len);
299 }
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300300 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300301}
302
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300303static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
304 const void *val)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300305{
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400306 struct kvm_ioapic *ioapic = to_ioapic(this);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300307 u32 data;
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300308 if (!ioapic_in_range(ioapic, addr))
309 return -EOPNOTSUPP;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300310
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200311 ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
312 (void*)addr, len, val);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300313 ASSERT(!(addr & 0xf)); /* check alignment */
Marcelo Tosatti60eead72009-06-04 15:08:23 -0300314
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300315 if (len == 4 || len == 8)
316 data = *(u32 *) val;
317 else {
318 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
Gleb Natapoveba02262009-08-24 11:54:25 +0300319 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300320 }
321
322 addr &= 0xff;
Gleb Natapoveba02262009-08-24 11:54:25 +0300323 mutex_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300324 switch (addr) {
325 case IOAPIC_REG_SELECT:
326 ioapic->ioregsel = data;
327 break;
328
329 case IOAPIC_REG_WINDOW:
330 ioapic_write_indirect(ioapic, data);
331 break;
Zhang Xiantaob1fd3d32007-12-02 22:53:07 +0800332#ifdef CONFIG_IA64
333 case IOAPIC_REG_EOI:
Gleb Natapoveba02262009-08-24 11:54:25 +0300334 __kvm_ioapic_update_eoi(ioapic, data, IOAPIC_LEVEL_TRIG);
Zhang Xiantaob1fd3d32007-12-02 22:53:07 +0800335 break;
336#endif
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300337
338 default:
339 break;
340 }
Gleb Natapoveba02262009-08-24 11:54:25 +0300341 mutex_unlock(&ioapic->lock);
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300342 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300343}
344
Eddie Dong8c392692007-10-10 12:15:54 +0200345void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
346{
347 int i;
348
349 for (i = 0; i < IOAPIC_NUM_PINS; i++)
350 ioapic->redirtbl[i].fields.mask = 1;
351 ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
352 ioapic->ioregsel = 0;
353 ioapic->irr = 0;
354 ioapic->id = 0;
355}
356
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400357static const struct kvm_io_device_ops ioapic_mmio_ops = {
358 .read = ioapic_mmio_read,
359 .write = ioapic_mmio_write,
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400360};
361
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300362int kvm_ioapic_init(struct kvm *kvm)
363{
364 struct kvm_ioapic *ioapic;
Gregory Haskins090b7af2009-07-07 17:08:44 -0400365 int ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300366
367 ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
368 if (!ioapic)
369 return -ENOMEM;
Gleb Natapoveba02262009-08-24 11:54:25 +0300370 mutex_init(&ioapic->lock);
Zhang Xiantaod7deeeb2007-12-14 10:17:34 +0800371 kvm->arch.vioapic = ioapic;
Eddie Dong8c392692007-10-10 12:15:54 +0200372 kvm_ioapic_reset(ioapic);
Gregory Haskinsd76685c2009-06-01 12:54:50 -0400373 kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300374 ioapic->kvm = kvm;
Gregory Haskins090b7af2009-07-07 17:08:44 -0400375 ret = kvm_io_bus_register_dev(kvm, &kvm->mmio_bus, &ioapic->dev);
376 if (ret < 0)
377 kfree(ioapic);
378
379 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300380}
Avi Kivity75858a82009-01-04 17:10:50 +0200381
Gleb Natapoveba02262009-08-24 11:54:25 +0300382int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
383{
384 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
385 if (!ioapic)
386 return -EINVAL;
387
388 mutex_lock(&ioapic->lock);
389 memcpy(state, ioapic, sizeof(struct kvm_ioapic_state));
390 mutex_unlock(&ioapic->lock);
391 return 0;
392}
393
394int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
395{
396 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
397 if (!ioapic)
398 return -EINVAL;
399
400 mutex_lock(&ioapic->lock);
401 memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
402 mutex_unlock(&ioapic->lock);
403 return 0;
404}