aboutsummaryrefslogtreecommitdiff
path: root/target/s390x/cpu.c
blob: e350edc9f53af75c275d1033dfc4a78b29888911 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
/*
 * QEMU S/390 CPU
 *
 * Copyright (c) 2009 Ulrich Hecht
 * Copyright (c) 2011 Alexander Graf
 * Copyright (c) 2012 SUSE LINUX Products GmbH
 * Copyright (c) 2012 IBM Corp.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "qemu/osdep.h"
#include "qapi/error.h"
#include "cpu.h"
#include "internal.h"
#include "kvm_s390x.h"
#include "sysemu/kvm.h"
#include "sysemu/reset.h"
#include "qemu/timer.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "trace.h"
#include "qapi/visitor.h"
#include "qapi/qapi-types-machine.h"
#include "qapi/qapi-visit-run-state.h"
#include "sysemu/hw_accel.h"
#include "hw/qdev-properties.h"
#ifndef CONFIG_USER_ONLY
#include "hw/s390x/pv.h"
#include "hw/boards.h"
#include "sysemu/arch_init.h"
#include "sysemu/sysemu.h"
#include "sysemu/tcg.h"
#endif
#include "fpu/softfloat-helpers.h"

#define CR0_RESET       0xE0UL
#define CR14_RESET      0xC2000000UL;

static void s390_cpu_set_pc(CPUState *cs, vaddr value)
{
    S390CPU *cpu = S390_CPU(cs);

    cpu->env.psw.addr = value;
}

static bool s390_cpu_has_work(CPUState *cs)
{
    S390CPU *cpu = S390_CPU(cs);

    /* STOPPED cpus can never wake up */
    if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
        s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
        return false;
    }

    if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
        return false;
    }

    return s390_cpu_has_int(cpu);
}

#if !defined(CONFIG_USER_ONLY)
/* S390CPUClass::load_normal() */
static void s390_cpu_load_normal(CPUState *s)
{
    S390CPU *cpu = S390_CPU(s);
    uint64_t spsw;

    if (!s390_is_pv()) {
        spsw = ldq_phys(s->as, 0);
        cpu->env.psw.mask = spsw & PSW_MASK_SHORT_CTRL;
        /*
         * Invert short psw indication, so SIE will report a specification
         * exception if it was not set.
         */
        cpu->env.psw.mask ^= PSW_MASK_SHORTPSW;
        cpu->env.psw.addr = spsw & PSW_MASK_SHORT_ADDR;
    } else {
        /*
         * Firmware requires us to set the load state before we set
         * the cpu to operating on protected guests.
         */
        s390_cpu_set_state(S390_CPU_STATE_LOAD, cpu);
    }
    s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
}
#endif

/* S390CPUClass::reset() */
static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
{
    S390CPU *cpu = S390_CPU(s);
    S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
    CPUS390XState *env = &cpu->env;
    DeviceState *dev = DEVICE(s);

    scc->parent_reset(dev);
    cpu->env.sigp_order = 0;
    s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);

    switch (type) {
    case S390_CPU_RESET_CLEAR:
        memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
        /* fall through */
    case S390_CPU_RESET_INITIAL:
        /* initial reset does not clear everything! */
        memset(&env->start_initial_reset_fields, 0,
               offsetof(CPUS390XState, start_normal_reset_fields) -
               offsetof(CPUS390XState, start_initial_reset_fields));

        /* architectured initial value for Breaking-Event-Address register */
        env->gbea = 1;

        /* architectured initial values for CR 0 and 14 */
        env->cregs[0] = CR0_RESET;
        env->cregs[14] = CR14_RESET;

#if defined(CONFIG_USER_ONLY)
        /* user mode should always be allowed to use the full FPU */
        env->cregs[0] |= CR0_AFP;
        if (s390_has_feat(S390_FEAT_VECTOR)) {
            env->cregs[0] |= CR0_VECTOR;
        }
#endif

        /* tininess for underflow is detected before rounding */
        set_float_detect_tininess(float_tininess_before_rounding,
                                  &env->fpu_status);
       /* fall through */
    case S390_CPU_RESET_NORMAL:
        env->psw.mask &= ~PSW_MASK_RI;
        memset(&env->start_normal_reset_fields, 0,
               offsetof(CPUS390XState, end_reset_fields) -
               offsetof(CPUS390XState, start_normal_reset_fields));

        env->pfault_token = -1UL;
        env->bpbc = false;
        break;
    default:
        g_assert_not_reached();
    }

    /* Reset state inside the kernel that we cannot access yet from QEMU. */
    if (kvm_enabled()) {
        switch (type) {
        case S390_CPU_RESET_CLEAR:
            kvm_s390_reset_vcpu_clear(cpu);
            break;
        case S390_CPU_RESET_INITIAL:
            kvm_s390_reset_vcpu_initial(cpu);
            break;
        case S390_CPU_RESET_NORMAL:
            kvm_s390_reset_vcpu_normal(cpu);
            break;
        }
    }
}

#if !defined(CONFIG_USER_ONLY)
static void s390_cpu_machine_reset_cb(void *opaque)
{
    S390CPU *cpu = opaque;

    run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
}
#endif

static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
{
    info->mach = bfd_mach_s390_64;
    info->print_insn = print_insn_s390;
}

static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
{
    CPUState *cs = CPU(dev);
    S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
#if !defined(CONFIG_USER_ONLY)
    S390CPU *cpu = S390_CPU(dev);
#endif
    Error *err = NULL;

    /* the model has to be realized before qemu_init_vcpu() due to kvm */
    s390_realize_cpu_model(cs, &err);
    if (err) {
        goto out;
    }

#if !defined(CONFIG_USER_ONLY)
    MachineState *ms = MACHINE(qdev_get_machine());
    unsigned int max_cpus = ms->smp.max_cpus;
    if (cpu->env.core_id >= max_cpus) {
        error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
                   ", maximum core-id: %d", cpu->env.core_id,
                   max_cpus - 1);
        goto out;
    }

    if (cpu_exists(cpu->env.core_id)) {
        error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
                   ", it already exists", cpu->env.core_id);
        goto out;
    }

    /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
    cs->cpu_index = cpu->env.core_id;
#endif

    cpu_exec_realizefn(cs, &err);
    if (err != NULL) {
        goto out;
    }

#if !defined(CONFIG_USER_ONLY)
    qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
#endif
    s390_cpu_gdb_init(cs);
    qemu_init_vcpu(cs);

    /*
     * KVM requires the initial CPU reset ioctl to be executed on the target
     * CPU thread. CPU hotplug under single-threaded TCG will not work with
     * run_on_cpu(), as run_on_cpu() will not work properly if called while
     * the main thread is already running but the CPU hasn't been realized.
     */
    if (kvm_enabled()) {
        run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
    } else {
        cpu_reset(cs);
    }

    scc->parent_realize(dev, &err);
out:
    error_propagate(errp, err);
}

#if !defined(CONFIG_USER_ONLY)
static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
{
    GuestPanicInformation *panic_info;
    S390CPU *cpu = S390_CPU(cs);

    cpu_synchronize_state(cs);
    panic_info = g_malloc0(sizeof(GuestPanicInformation));

    panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
    panic_info->u.s390.core = cpu->env.core_id;
    panic_info->u.s390.psw_mask = cpu->env.psw.mask;
    panic_info->u.s390.psw_addr = cpu->env.psw.addr;
    panic_info->u.s390.reason = cpu->env.crash_reason;

    return panic_info;
}

static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
                                        const char *name, void *opaque,
                                        Error **errp)
{
    CPUState *cs = CPU(obj);
    GuestPanicInformation *panic_info;

    if (!cs->crash_occurred) {
        error_setg(errp, "No crash occurred");
        return;
    }

    panic_info = s390_cpu_get_crash_info(cs);

    visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
                                     errp);
    qapi_free_GuestPanicInformation(panic_info);
}
#endif

static void s390_cpu_initfn(Object *obj)
{
    CPUState *cs = CPU(obj);
    S390CPU *cpu = S390_CPU(obj);

    cpu_set_cpustate_pointers(cpu);
    cs->exception_index = EXCP_HLT;
#if !defined(CONFIG_USER_ONLY)
    cs->start_powered_off = true;
    object_property_add(obj, "crash-information", "GuestPanicInformation",
                        s390_cpu_get_crash_info_qom, NULL, NULL, NULL);
    cpu->env.tod_timer =
        timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
    cpu->env.cpu_timer =
        timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
    s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
#endif
    s390_cpu_model_register_props(obj);
}

static void s390_cpu_finalize(Object *obj)
{
#if !defined(CONFIG_USER_ONLY)
    S390CPU *cpu = S390_CPU(obj);

    qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
    g_free(cpu->irqstate);
#endif
}

#if !defined(CONFIG_USER_ONLY)
static bool disabled_wait(CPUState *cpu)
{
    return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
                            (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
}

static unsigned s390_count_running_cpus(void)
{
    CPUState *cpu;
    int nr_running = 0;

    CPU_FOREACH(cpu) {
        uint8_t state = S390_CPU(cpu)->env.cpu_state;
        if (state == S390_CPU_STATE_OPERATING ||
            state == S390_CPU_STATE_LOAD) {
            if (!disabled_wait(cpu)) {
                nr_running++;
            }
        }
    }

    return nr_running;
}

unsigned int s390_cpu_halt(S390CPU *cpu)
{
    CPUState *cs = CPU(cpu);
    trace_cpu_halt(cs->cpu_index);

    if (!cs->halted) {
        cs->halted = 1;
        cs->exception_index = EXCP_HLT;
    }

    return s390_count_running_cpus();
}

void s390_cpu_unhalt(S390CPU *cpu)
{
    CPUState *cs = CPU(cpu);
    trace_cpu_unhalt(cs->cpu_index);

    if (cs->halted) {
        cs->halted = 0;
        cs->exception_index = -1;
    }
}

unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 {
    trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);

    switch (cpu_state) {
    case S390_CPU_STATE_STOPPED:
    case S390_CPU_STATE_CHECK_STOP:
        /* halt the cpu for common infrastructure */
        s390_cpu_halt(cpu);
        break;
    case S390_CPU_STATE_OPERATING:
    case S390_CPU_STATE_LOAD:
        /*
         * Starting a CPU with a PSW WAIT bit set:
         * KVM: handles this internally and triggers another WAIT exit.
         * TCG: will actually try to continue to run. Don't unhalt, will
         *      be done when the CPU actually has work (an interrupt).
         */
        if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
            s390_cpu_unhalt(cpu);
        }
        break;
    default:
        error_report("Requested CPU state is not a valid S390 CPU state: %u",
                     cpu_state);
        exit(1);
    }
    if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
        kvm_s390_set_cpu_state(cpu, cpu_state);
    }
    cpu->env.cpu_state = cpu_state;

    return s390_count_running_cpus();
}

int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
{
    if (kvm_enabled()) {
        return kvm_s390_set_mem_limit(new_limit, hw_limit);
    }
    return 0;
}

void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
{
    if (kvm_enabled()) {
        kvm_s390_set_max_pagesize(pagesize, errp);
    }
}

void s390_cmma_reset(void)
{
    if (kvm_enabled()) {
        kvm_s390_cmma_reset();
    }
}

int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
                                int vq, bool assign)
{
    if (kvm_enabled()) {
        return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
    } else {
        return 0;
    }
}

void s390_crypto_reset(void)
{
    if (kvm_enabled()) {
        kvm_s390_crypto_reset();
    }
}

void s390_enable_css_support(S390CPU *cpu)
{
    if (kvm_enabled()) {
        kvm_s390_enable_css_support(cpu);
    }
}
#endif

static gchar *s390_gdb_arch_name(CPUState *cs)
{
    return g_strdup("s390:64-bit");
}

static Property s390x_cpu_properties[] = {
#if !defined(CONFIG_USER_ONLY)
    DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
#endif
    DEFINE_PROP_END_OF_LIST()
};

static void s390_cpu_reset_full(DeviceState *dev)
{
    CPUState *s = CPU(dev);
    return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
}

static void s390_cpu_class_init(ObjectClass *oc, void *data)
{
    S390CPUClass *scc = S390_CPU_CLASS(oc);
    CPUClass *cc = CPU_CLASS(scc);
    DeviceClass *dc = DEVICE_CLASS(oc);

    device_class_set_parent_realize(dc, s390_cpu_realizefn,
                                    &scc->parent_realize);
    device_class_set_props(dc, s390x_cpu_properties);
    dc->user_creatable = true;

    device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset);
#if !defined(CONFIG_USER_ONLY)
    scc->load_normal = s390_cpu_load_normal;
#endif
    scc->reset = s390_cpu_reset;
    cc->class_by_name = s390_cpu_class_by_name,
    cc->has_work = s390_cpu_has_work;
#ifdef CONFIG_TCG
    cc->do_interrupt = s390_cpu_do_interrupt;
#endif
    cc->dump_state = s390_cpu_dump_state;
    cc->set_pc = s390_cpu_set_pc;
    cc->gdb_read_register = s390_cpu_gdb_read_register;
    cc->gdb_write_register = s390_cpu_gdb_write_register;
#ifndef CONFIG_USER_ONLY
    cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
    cc->vmsd = &vmstate_s390_cpu;
    cc->get_crash_info = s390_cpu_get_crash_info;
    cc->write_elf64_note = s390_cpu_write_elf64_note;
#ifdef CONFIG_TCG
    cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
    cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
    cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
#endif
#endif
    cc->disas_set_info = s390_cpu_disas_set_info;
#ifdef CONFIG_TCG
    cc->tcg_initialize = s390x_translate_init;
    cc->tlb_fill = s390_cpu_tlb_fill;
#endif

    cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
    cc->gdb_core_xml_file = "s390x-core64.xml";
    cc->gdb_arch_name = s390_gdb_arch_name;

    s390_cpu_model_class_register_props(oc);
}

static const TypeInfo s390_cpu_type_info = {
    .name = TYPE_S390_CPU,
    .parent = TYPE_CPU,
    .instance_size = sizeof(S390CPU),
    .instance_align = __alignof__(S390CPU),
    .instance_init = s390_cpu_initfn,
    .instance_finalize = s390_cpu_finalize,
    .abstract = true,
    .class_size = sizeof(S390CPUClass),
    .class_init = s390_cpu_class_init,
};

static void s390_cpu_register_types(void)
{
    type_register_static(&s390_cpu_type_info);
}

type_init(s390_cpu_register_types)