target/s390x/cpu-sysemu.c

   1 /*
   2  * QEMU S/390 CPU - System Emulation-only code
   3  *
   4  * Copyright (c) 2009 Ulrich Hecht
   5  * Copyright (c) 2011 Alexander Graf
   6  * Copyright (c) 2012 SUSE LINUX Products GmbH
   7  * Copyright (c) 2012 IBM Corp.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include "qemu/osdep.h"
  24 #include "qemu/error-report.h"
  25 #include "qapi/error.h"
  26 #include "cpu.h"
  27 #include "s390x-internal.h"
  28 #include "kvm/kvm_s390x.h"
  29 #include "sysemu/kvm.h"
  30 #include "sysemu/reset.h"
  31 #include "qemu/timer.h"
  32 #include "trace.h"
  33 #include "qapi/qapi-visit-run-state.h"
  34 #include "sysemu/hw_accel.h"
  35
  36 #include "target/s390x/kvm/pv.h"
  37 #include "hw/boards.h"
  38 #include "sysemu/sysemu.h"
  39 #include "sysemu/tcg.h"
  40 #include "hw/core/sysemu-cpu-ops.h"
  41
  42 /* S390CPUClass::load_normal() */
  43 static void s390_cpu_load_normal(CPUState *s)
  44 {
  45     S390CPU *cpu = S390_CPU(s);
  46     uint64_t spsw;
  47
  48     if (!s390_is_pv()) {
  49         spsw = ldq_phys(s->as, 0);
  50         cpu->env.psw.mask = spsw & PSW_MASK_SHORT_CTRL;
  51         /*
  52          * Invert short psw indication, so SIE will report a specification
  53          * exception if it was not set.
  54          */
  55         cpu->env.psw.mask ^= PSW_MASK_SHORTPSW;
  56         cpu->env.psw.addr = spsw & PSW_MASK_SHORT_ADDR;
  57     } else {
  58         /*
  59          * Firmware requires us to set the load state before we set
  60          * the cpu to operating on protected guests.
  61          */
  62         s390_cpu_set_state(S390_CPU_STATE_LOAD, cpu);
  63     }
  64     s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
  65 }
  66
  67 void s390_cpu_machine_reset_cb(void *opaque)
  68 {
  69     S390CPU *cpu = opaque;
  70
  71     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
  72 }
  73
  74 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
  75 {
  76     GuestPanicInformation *panic_info;
  77     S390CPU *cpu = S390_CPU(cs);
  78
  79     cpu_synchronize_state(cs);
  80     panic_info = g_new0(GuestPanicInformation, 1);
  81
  82     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
  83     panic_info->u.s390.core = cpu->env.core_id;
  84     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
  85     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
  86     panic_info->u.s390.reason = cpu->env.crash_reason;
  87
  88     return panic_info;
  89 }
  90
  91 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
  92                                         const char *name, void *opaque,
  93                                         Error **errp)
  94 {
  95     CPUState *cs = CPU(obj);
  96     GuestPanicInformation *panic_info;
  97
  98     if (!cs->crash_occurred) {
  99         error_setg(errp, "No crash occurred");
 100         return;
 101     }
 102
 103     panic_info = s390_cpu_get_crash_info(cs);
 104
 105     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 106                                      errp);
 107     qapi_free_GuestPanicInformation(panic_info);
 108 }
 109
 110 void s390_cpu_init_sysemu(Object *obj)
 111 {
 112     CPUState *cs = CPU(obj);
 113     S390CPU *cpu = S390_CPU(obj);
 114
 115     cs->start_powered_off = true;
 116     object_property_add(obj, "crash-information", "GuestPanicInformation",
 117                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL);
 118     cpu->env.tod_timer =
 119         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 120     cpu->env.cpu_timer =
 121         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 122     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 123 }
 124
 125 bool s390_cpu_realize_sysemu(DeviceState *dev, Error **errp)
 126 {
 127     S390CPU *cpu = S390_CPU(dev);
 128     MachineState *ms = MACHINE(qdev_get_machine());
 129     unsigned int max_cpus = ms->smp.max_cpus;
 130
 131     if (cpu->env.core_id >= max_cpus) {
 132         error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
 133                    ", maximum core-id: %d", cpu->env.core_id,
 134                    max_cpus - 1);
 135         return false;
 136     }
 137
 138     if (cpu_exists(cpu->env.core_id)) {
 139         error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
 140                    ", it already exists", cpu->env.core_id);
 141         return false;
 142     }
 143
 144     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 145     CPU(cpu)->cpu_index = cpu->env.core_id;
 146     return true;
 147 }
 148
 149 void s390_cpu_finalize(Object *obj)
 150 {
 151     S390CPU *cpu = S390_CPU(obj);
 152
 153     timer_free(cpu->env.tod_timer);
 154     timer_free(cpu->env.cpu_timer);
 155
 156     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 157     g_free(cpu->irqstate);
 158 }
 159
 160 static const struct SysemuCPUOps s390_sysemu_ops = {
 161     .get_phys_page_debug = s390_cpu_get_phys_page_debug,
 162     .get_crash_info = s390_cpu_get_crash_info,
 163     .write_elf64_note = s390_cpu_write_elf64_note,
 164     .legacy_vmsd = &vmstate_s390_cpu,
 165 };
 166
 167 void s390_cpu_class_init_sysemu(CPUClass *cc)
 168 {
 169     S390CPUClass *scc = S390_CPU_CLASS(cc);
 170
 171     scc->load_normal = s390_cpu_load_normal;
 172     cc->sysemu_ops = &s390_sysemu_ops;
 173 }
 174
 175 static bool disabled_wait(CPUState *cpu)
 176 {
 177     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 178                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 179 }
 180
 181 static unsigned s390_count_running_cpus(void)
 182 {
 183     CPUState *cpu;
 184     int nr_running = 0;
 185
 186     CPU_FOREACH(cpu) {
 187         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 188         if (state == S390_CPU_STATE_OPERATING ||
 189             state == S390_CPU_STATE_LOAD) {
 190             if (!disabled_wait(cpu)) {
 191                 nr_running++;
 192             }
 193         }
 194     }
 195
 196     return nr_running;
 197 }
 198
 199 unsigned int s390_cpu_halt(S390CPU *cpu)
 200 {
 201     CPUState *cs = CPU(cpu);
 202     trace_cpu_halt(cs->cpu_index);
 203
 204     if (!cs->halted) {
 205         cs->halted = 1;
 206         cs->exception_index = EXCP_HLT;
 207     }
 208
 209     return s390_count_running_cpus();
 210 }
 211
 212 void s390_cpu_unhalt(S390CPU *cpu)
 213 {
 214     CPUState *cs = CPU(cpu);
 215     trace_cpu_unhalt(cs->cpu_index);
 216
 217     if (cs->halted) {
 218         cs->halted = 0;
 219         cs->exception_index = -1;
 220     }
 221 }
 222
 223 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 224  {
 225     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 226
 227     switch (cpu_state) {
 228     case S390_CPU_STATE_STOPPED:
 229     case S390_CPU_STATE_CHECK_STOP:
 230         /* halt the cpu for common infrastructure */
 231         s390_cpu_halt(cpu);
 232         break;
 233     case S390_CPU_STATE_OPERATING:
 234     case S390_CPU_STATE_LOAD:
 235         /*
 236          * Starting a CPU with a PSW WAIT bit set:
 237          * KVM: handles this internally and triggers another WAIT exit.
 238          * TCG: will actually try to continue to run. Don't unhalt, will
 239          *      be done when the CPU actually has work (an interrupt).
 240          */
 241         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 242             s390_cpu_unhalt(cpu);
 243         }
 244         break;
 245     default:
 246         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 247                      cpu_state);
 248         exit(1);
 249     }
 250     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 251         kvm_s390_set_cpu_state(cpu, cpu_state);
 252     }
 253     cpu->env.cpu_state = cpu_state;
 254
 255     return s390_count_running_cpus();
 256 }
 257
 258 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 259 {
 260     if (kvm_enabled()) {
 261         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 262     }
 263     return 0;
 264 }
 265
 266 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 267 {
 268     if (kvm_enabled()) {
 269         kvm_s390_set_max_pagesize(pagesize, errp);
 270     }
 271 }
 272
 273 void s390_cmma_reset(void)
 274 {
 275     if (kvm_enabled()) {
 276         kvm_s390_cmma_reset();
 277     }
 278 }
 279
 280 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 281                                 int vq, bool assign)
 282 {
 283     if (kvm_enabled()) {
 284         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 285     } else {
 286         return 0;
 287     }
 288 }
 289
 290 void s390_crypto_reset(void)
 291 {
 292     if (kvm_enabled()) {
 293         kvm_s390_crypto_reset();
 294     }
 295 }
 296
 297 void s390_enable_css_support(S390CPU *cpu)
 298 {
 299     if (kvm_enabled()) {
 300         kvm_s390_enable_css_support(cpu);
 301     }
 302 }
 303
 304 void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg)
 305 {
 306     if (kvm_enabled()) {
 307         kvm_s390_set_diag318(cs, arg.host_ulong);
 308     }
 309 }
 310
 311 void s390_cpu_topology_set_changed(bool changed)
 312 {
 313     int ret;
 314
 315     if (kvm_enabled()) {
 316         ret = kvm_s390_topology_set_mtcr(changed);
 317         if (ret) {
 318             error_report("Failed to set Modified Topology Change Report: %s",
 319                          strerror(-ret));
 320         }
 321     }
 322 }