xref: /openbmc/qemu/hw/intc/apic_common.c (revision 2fc979cb) 
1 /*
2  *  APIC support - common bits of emulated and KVM kernel model
3  *
4  *  Copyright (c) 2004-2005 Fabrice Bellard
5  *  Copyright (c) 2011      Jan Kiszka, Siemens AG
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library; if not, see <http://www.gnu.org/licenses/>
19  */
20 
21 #include "qemu/osdep.h"
22 #include "qemu/error-report.h"
23 #include "qemu/module.h"
24 #include "qapi/error.h"
25 #include "cpu.h"
26 #include "qapi/visitor.h"
27 #include "hw/i386/apic.h"
28 #include "hw/i386/apic_internal.h"
29 #include "trace.h"
30 #include "sysemu/hax.h"
31 #include "sysemu/kvm.h"
32 #include "hw/qdev-properties.h"
33 #include "hw/sysbus.h"
34 #include "migration/vmstate.h"
35 
36 static int apic_irq_delivered;
37 bool apic_report_tpr_access;
38 
39 void cpu_set_apic_base(DeviceState *dev, uint64_t val)
40 {
41     trace_cpu_set_apic_base(val);
42 
43     if (dev) {
44         APICCommonState *s = APIC_COMMON(dev);
45         APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
46         /* switching to x2APIC, reset possibly modified xAPIC ID */
47         if (!(s->apicbase & MSR_IA32_APICBASE_EXTD) &&
48             (val & MSR_IA32_APICBASE_EXTD)) {
49             s->id = s->initial_apic_id;
50         }
51         info->set_base(s, val);
52     }
53 }
54 
55 uint64_t cpu_get_apic_base(DeviceState *dev)
56 {
57     if (dev) {
58         APICCommonState *s = APIC_COMMON(dev);
59         trace_cpu_get_apic_base((uint64_t)s->apicbase);
60         return s->apicbase;
61     } else {
62         trace_cpu_get_apic_base(MSR_IA32_APICBASE_BSP);
63         return MSR_IA32_APICBASE_BSP;
64     }
65 }
66 
67 void cpu_set_apic_tpr(DeviceState *dev, uint8_t val)
68 {
69     APICCommonState *s;
70     APICCommonClass *info;
71 
72     if (!dev) {
73         return;
74     }
75 
76     s = APIC_COMMON(dev);
77     info = APIC_COMMON_GET_CLASS(s);
78 
79     info->set_tpr(s, val);
80 }
81 
82 uint8_t cpu_get_apic_tpr(DeviceState *dev)
83 {
84     APICCommonState *s;
85     APICCommonClass *info;
86 
87     if (!dev) {
88         return 0;
89     }
90 
91     s = APIC_COMMON(dev);
92     info = APIC_COMMON_GET_CLASS(s);
93 
94     return info->get_tpr(s);
95 }
96 
97 void apic_enable_tpr_access_reporting(DeviceState *dev, bool enable)
98 {
99     APICCommonState *s = APIC_COMMON(dev);
100     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
101 
102     apic_report_tpr_access = enable;
103     if (info->enable_tpr_reporting) {
104         info->enable_tpr_reporting(s, enable);
105     }
106 }
107 
108 void apic_enable_vapic(DeviceState *dev, hwaddr paddr)
109 {
110     APICCommonState *s = APIC_COMMON(dev);
111     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
112 
113     s->vapic_paddr = paddr;
114     info->vapic_base_update(s);
115 }
116 
117 void apic_handle_tpr_access_report(DeviceState *dev, target_ulong ip,
118                                    TPRAccess access)
119 {
120     APICCommonState *s = APIC_COMMON(dev);
121 
122     vapic_report_tpr_access(s->vapic, CPU(s->cpu), ip, access);
123 }
124 
125 void apic_report_irq_delivered(int delivered)
126 {
127     apic_irq_delivered += delivered;
128 
129     trace_apic_report_irq_delivered(apic_irq_delivered);
130 }
131 
132 void apic_reset_irq_delivered(void)
133 {
134     /* Copy this into a local variable to encourage gcc to emit a plain
135      * register for a sys/sdt.h marker.  For details on this workaround, see:
136      * https://sourceware.org/bugzilla/show_bug.cgi?id=13296
137      */
138     volatile int a_i_d = apic_irq_delivered;
139     trace_apic_reset_irq_delivered(a_i_d);
140 
141     apic_irq_delivered = 0;
142 }
143 
144 int apic_get_irq_delivered(void)
145 {
146     trace_apic_get_irq_delivered(apic_irq_delivered);
147 
148     return apic_irq_delivered;
149 }
150 
151 void apic_deliver_nmi(DeviceState *dev)
152 {
153     APICCommonState *s = APIC_COMMON(dev);
154     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
155 
156     info->external_nmi(s);
157 }
158 
159 bool apic_next_timer(APICCommonState *s, int64_t current_time)
160 {
161     int64_t d;
162 
163     /* We need to store the timer state separately to support APIC
164      * implementations that maintain a non-QEMU timer, e.g. inside the
165      * host kernel. This open-coded state allows us to migrate between
166      * both models. */
167     s->timer_expiry = -1;
168 
169     if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_MASKED) {
170         return false;
171     }
172 
173     d = (current_time - s->initial_count_load_time) >> s->count_shift;
174 
175     if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
176         if (!s->initial_count) {
177             return false;
178         }
179         d = ((d / ((uint64_t)s->initial_count + 1)) + 1) *
180             ((uint64_t)s->initial_count + 1);
181     } else {
182         if (d >= s->initial_count) {
183             return false;
184         }
185         d = (uint64_t)s->initial_count + 1;
186     }
187     s->next_time = s->initial_count_load_time + (d << s->count_shift);
188     s->timer_expiry = s->next_time;
189     return true;
190 }
191 
192 void apic_init_reset(DeviceState *dev)
193 {
194     APICCommonState *s;
195     APICCommonClass *info;
196     int i;
197 
198     if (!dev) {
199         return;
200     }
201     s = APIC_COMMON(dev);
202     s->tpr = 0;
203     s->spurious_vec = 0xff;
204     s->log_dest = 0;
205     s->dest_mode = 0xf;
206     memset(s->isr, 0, sizeof(s->isr));
207     memset(s->tmr, 0, sizeof(s->tmr));
208     memset(s->irr, 0, sizeof(s->irr));
209     for (i = 0; i < APIC_LVT_NB; i++) {
210         s->lvt[i] = APIC_LVT_MASKED;
211     }
212     s->esr = 0;
213     memset(s->icr, 0, sizeof(s->icr));
214     s->divide_conf = 0;
215     s->count_shift = 0;
216     s->initial_count = 0;
217     s->initial_count_load_time = 0;
218     s->next_time = 0;
219     s->wait_for_sipi = !cpu_is_bsp(s->cpu);
220 
221     if (s->timer) {
222         timer_del(s->timer);
223     }
224     s->timer_expiry = -1;
225 
226     info = APIC_COMMON_GET_CLASS(s);
227     if (info->reset) {
228         info->reset(s);
229     }
230 }
231 
232 void apic_designate_bsp(DeviceState *dev, bool bsp)
233 {
234     if (dev == NULL) {
235         return;
236     }
237 
238     APICCommonState *s = APIC_COMMON(dev);
239     if (bsp) {
240         s->apicbase |= MSR_IA32_APICBASE_BSP;
241     } else {
242         s->apicbase &= ~MSR_IA32_APICBASE_BSP;
243     }
244 }
245 
246 static void apic_reset_common(DeviceState *dev)
247 {
248     APICCommonState *s = APIC_COMMON(dev);
249     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
250     uint32_t bsp;
251 
252     bsp = s->apicbase & MSR_IA32_APICBASE_BSP;
253     s->apicbase = APIC_DEFAULT_ADDRESS | bsp | MSR_IA32_APICBASE_ENABLE;
254     s->id = s->initial_apic_id;
255 
256     apic_reset_irq_delivered();
257 
258     s->vapic_paddr = 0;
259     info->vapic_base_update(s);
260 
261     apic_init_reset(dev);
262 }
263 
264 static const VMStateDescription vmstate_apic_common;
265 
266 static void apic_common_realize(DeviceState *dev, Error **errp)
267 {
268     APICCommonState *s = APIC_COMMON(dev);
269     APICCommonClass *info;
270     static DeviceState *vapic;
271     uint32_t instance_id = s->initial_apic_id;
272 
273     /* Normally initial APIC ID should be no more than hundreds */
274     assert(instance_id != VMSTATE_INSTANCE_ID_ANY);
275 
276     info = APIC_COMMON_GET_CLASS(s);
277     info->realize(dev, errp);
278 
279     /* Note: We need at least 1M to map the VAPIC option ROM */
280     if (!vapic && s->vapic_control & VAPIC_ENABLE_MASK &&
281         !hax_enabled() && ram_size >= 1024 * 1024) {
282         vapic = sysbus_create_simple("kvmvapic", -1, NULL);
283     }
284     s->vapic = vapic;
285     if (apic_report_tpr_access && info->enable_tpr_reporting) {
286         info->enable_tpr_reporting(s, true);
287     }
288 
289     if (s->legacy_instance_id) {
290         instance_id = VMSTATE_INSTANCE_ID_ANY;
291     }
292     vmstate_register_with_alias_id(NULL, instance_id, &vmstate_apic_common,
293                                    s, -1, 0, NULL);
294 }
295 
296 static void apic_common_unrealize(DeviceState *dev)
297 {
298     APICCommonState *s = APIC_COMMON(dev);
299     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
300 
301     vmstate_unregister(NULL, &vmstate_apic_common, s);
302     info->unrealize(dev);
303 
304     if (apic_report_tpr_access && info->enable_tpr_reporting) {
305         info->enable_tpr_reporting(s, false);
306     }
307 }
308 
309 static int apic_pre_load(void *opaque)
310 {
311     APICCommonState *s = APIC_COMMON(opaque);
312 
313     /* The default is !cpu_is_bsp(s->cpu), but the common value is 0
314      * so that's what apic_common_sipi_needed checks for.  Reset to
315      * the value that is assumed when the apic_sipi subsection is
316      * absent.
317      */
318     s->wait_for_sipi = 0;
319     return 0;
320 }
321 
322 static int apic_dispatch_pre_save(void *opaque)
323 {
324     APICCommonState *s = APIC_COMMON(opaque);
325     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
326 
327     if (info->pre_save) {
328         info->pre_save(s);
329     }
330 
331     return 0;
332 }
333 
334 static int apic_dispatch_post_load(void *opaque, int version_id)
335 {
336     APICCommonState *s = APIC_COMMON(opaque);
337     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
338 
339     if (info->post_load) {
340         info->post_load(s);
341     }
342     return 0;
343 }
344 
345 static bool apic_common_sipi_needed(void *opaque)
346 {
347     APICCommonState *s = APIC_COMMON(opaque);
348     return s->wait_for_sipi != 0;
349 }
350 
351 static const VMStateDescription vmstate_apic_common_sipi = {
352     .name = "apic_sipi",
353     .version_id = 1,
354     .minimum_version_id = 1,
355     .needed = apic_common_sipi_needed,
356     .fields = (VMStateField[]) {
357         VMSTATE_INT32(sipi_vector, APICCommonState),
358         VMSTATE_INT32(wait_for_sipi, APICCommonState),
359         VMSTATE_END_OF_LIST()
360     }
361 };
362 
363 static const VMStateDescription vmstate_apic_common = {
364     .name = "apic",
365     .version_id = 3,
366     .minimum_version_id = 3,
367     .pre_load = apic_pre_load,
368     .pre_save = apic_dispatch_pre_save,
369     .post_load = apic_dispatch_post_load,
370     .fields = (VMStateField[]) {
371         VMSTATE_UINT32(apicbase, APICCommonState),
372         VMSTATE_UINT8(id, APICCommonState),
373         VMSTATE_UINT8(arb_id, APICCommonState),
374         VMSTATE_UINT8(tpr, APICCommonState),
375         VMSTATE_UINT32(spurious_vec, APICCommonState),
376         VMSTATE_UINT8(log_dest, APICCommonState),
377         VMSTATE_UINT8(dest_mode, APICCommonState),
378         VMSTATE_UINT32_ARRAY(isr, APICCommonState, 8),
379         VMSTATE_UINT32_ARRAY(tmr, APICCommonState, 8),
380         VMSTATE_UINT32_ARRAY(irr, APICCommonState, 8),
381         VMSTATE_UINT32_ARRAY(lvt, APICCommonState, APIC_LVT_NB),
382         VMSTATE_UINT32(esr, APICCommonState),
383         VMSTATE_UINT32_ARRAY(icr, APICCommonState, 2),
384         VMSTATE_UINT32(divide_conf, APICCommonState),
385         VMSTATE_INT32(count_shift, APICCommonState),
386         VMSTATE_UINT32(initial_count, APICCommonState),
387         VMSTATE_INT64(initial_count_load_time, APICCommonState),
388         VMSTATE_INT64(next_time, APICCommonState),
389         VMSTATE_INT64(timer_expiry,
390                       APICCommonState), /* open-coded timer state */
391         VMSTATE_END_OF_LIST()
392     },
393     .subsections = (const VMStateDescription*[]) {
394         &vmstate_apic_common_sipi,
395         NULL
396     }
397 };
398 
399 static Property apic_properties_common[] = {
400     DEFINE_PROP_UINT8("version", APICCommonState, version, 0x14),
401     DEFINE_PROP_BIT("vapic", APICCommonState, vapic_control, VAPIC_ENABLE_BIT,
402                     true),
403     DEFINE_PROP_BOOL("legacy-instance-id", APICCommonState, legacy_instance_id,
404                      false),
405     DEFINE_PROP_END_OF_LIST(),
406 };
407 
408 static void apic_common_get_id(Object *obj, Visitor *v, const char *name,
409                                void *opaque, Error **errp)
410 {
411     APICCommonState *s = APIC_COMMON(obj);
412     uint32_t value;
413 
414     value = s->apicbase & MSR_IA32_APICBASE_EXTD ? s->initial_apic_id : s->id;
415     visit_type_uint32(v, name, &value, errp);
416 }
417 
418 static void apic_common_set_id(Object *obj, Visitor *v, const char *name,
419                                void *opaque, Error **errp)
420 {
421     APICCommonState *s = APIC_COMMON(obj);
422     DeviceState *dev = DEVICE(obj);
423     Error *local_err = NULL;
424     uint32_t value;
425 
426     if (dev->realized) {
427         qdev_prop_set_after_realize(dev, name, errp);
428         return;
429     }
430 
431     visit_type_uint32(v, name, &value, &local_err);
432     if (local_err) {
433         error_propagate(errp, local_err);
434         return;
435     }
436 
437     s->initial_apic_id = value;
438     s->id = (uint8_t)value;
439 }
440 
441 static void apic_common_initfn(Object *obj)
442 {
443     APICCommonState *s = APIC_COMMON(obj);
444 
445     s->id = s->initial_apic_id = -1;
446     object_property_add(obj, "id", "uint32",
447                         apic_common_get_id,
448                         apic_common_set_id, NULL, NULL);
449 }
450 
451 static void apic_common_class_init(ObjectClass *klass, void *data)
452 {
453     DeviceClass *dc = DEVICE_CLASS(klass);
454 
455     dc->reset = apic_reset_common;
456     device_class_set_props(dc, apic_properties_common);
457     dc->realize = apic_common_realize;
458     dc->unrealize = apic_common_unrealize;
459     /*
460      * Reason: APIC and CPU need to be wired up by
461      * x86_cpu_apic_create()
462      */
463     dc->user_creatable = false;
464 }
465 
466 static const TypeInfo apic_common_type = {
467     .name = TYPE_APIC_COMMON,
468     .parent = TYPE_DEVICE,
469     .instance_size = sizeof(APICCommonState),
470     .instance_init = apic_common_initfn,
471     .class_size = sizeof(APICCommonClass),
472     .class_init = apic_common_class_init,
473     .abstract = true,
474 };
475 
476 static void apic_common_register_types(void)
477 {
478     type_register_static(&apic_common_type);
479 }
480 
481 type_init(apic_common_register_types)
482