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 "qapi/error.h"
  25 #include "cpu.h"
  26 #include "s390x-internal.h"
  27 #include "kvm/kvm_s390x.h"
  28 #include "sysemu/kvm.h"
  29 #include "sysemu/reset.h"
  30 #include "qemu/timer.h"
  31 #include "trace.h"
  32 #include "qapi/qapi-visit-run-state.h"
  33 #include "sysemu/hw_accel.h"
  34
  35 #include "hw/s390x/pv.h"
  36 #include "hw/boards.h"
  37 #include "sysemu/sysemu.h"
  38 #include "sysemu/tcg.h"
  39 #include "hw/core/sysemu-cpu-ops.h"
  40
  41 /* S390CPUClass::load_normal() */
  42 static void s390_cpu_load_normal(CPUState *s)
  43 {
  44     S390CPU *cpu = S390_CPU(s);
  45     uint64_t spsw;
  46
  47     if (!s390_is_pv()) {
  48         spsw = ldq_phys(s->as, 0);
  49         cpu->env.psw.mask = spsw & PSW_MASK_SHORT_CTRL;
  50         /*
  51          * Invert short psw indication, so SIE will report a specification
  52          * exception if it was not set.
  53          */
  54         cpu->env.psw.mask ^= PSW_MASK_SHORTPSW;
  55         cpu->env.psw.addr = spsw & PSW_MASK_SHORT_ADDR;
  56     } else {
  57         /*
  58          * Firmware requires us to set the load state before we set
  59          * the cpu to operating on protected guests.
  60          */
  61         s390_cpu_set_state(S390_CPU_STATE_LOAD, cpu);
  62     }
  63     s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
  64 }
  65
  66 void s390_cpu_machine_reset_cb(void *opaque)
  67 {
  68     S390CPU *cpu = opaque;
  69
  70     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
  71 }
  72
  73 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
  74 {
  75     GuestPanicInformation *panic_info;
  76     S390CPU *cpu = S390_CPU(cs);
  77
  78     cpu_synchronize_state(cs);
  79     panic_info = g_new0(GuestPanicInformation, 1);
  80
  81     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
  82     panic_info->u.s390.core = cpu->env.core_id;
  83     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
  84     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
  85     panic_info->u.s390.reason = cpu->env.crash_reason;
  86
  87     return panic_info;
  88 }
  89
  90 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
  91                                         const char *name, void *opaque,
  92                                         Error **errp)
  93 {
  94     CPUState *cs = CPU(obj);
  95     GuestPanicInformation *panic_info;
  96
  97     if (!cs->crash_occurred) {
  98         error_setg(errp, "No crash occurred");
  99         return;
 100     }
 101
 102     panic_info = s390_cpu_get_crash_info(cs);
 103
 104     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 105                                      errp);
 106     qapi_free_GuestPanicInformation(panic_info);
 107 }
 108
 109 void s390_cpu_init_sysemu(Object *obj)
 110 {
 111     CPUState *cs = CPU(obj);
 112     S390CPU *cpu = S390_CPU(obj);
 113
 114     cs->start_powered_off = true;
 115     object_property_add(obj, "crash-information", "GuestPanicInformation",
 116                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL);
 117     cpu->env.tod_timer =
 118         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 119     cpu->env.cpu_timer =
 120         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 121     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 122 }
 123
 124 bool s390_cpu_realize_sysemu(DeviceState *dev, Error **errp)
 125 {
 126     S390CPU *cpu = S390_CPU(dev);
 127     MachineState *ms = MACHINE(qdev_get_machine());
 128     unsigned int max_cpus = ms->smp.max_cpus;
 129
 130     if (cpu->env.core_id >= max_cpus) {
 131         error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
 132                    ", maximum core-id: %d", cpu->env.core_id,
 133                    max_cpus - 1);
 134         return false;
 135     }
 136
 137     if (cpu_exists(cpu->env.core_id)) {
 138         error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
 139                    ", it already exists", cpu->env.core_id);
 140         return false;
 141     }
 142
 143     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 144     CPU(cpu)->cpu_index = cpu->env.core_id;
 145     return true;
 146 }
 147
 148 void s390_cpu_finalize(Object *obj)
 149 {
 150     S390CPU *cpu = S390_CPU(obj);
 151
 152     timer_free(cpu->env.tod_timer);
 153     timer_free(cpu->env.cpu_timer);
 154
 155     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 156     g_free(cpu->irqstate);
 157 }
 158
 159 static const struct SysemuCPUOps s390_sysemu_ops = {
 160     .get_phys_page_debug = s390_cpu_get_phys_page_debug,
 161     .get_crash_info = s390_cpu_get_crash_info,
 162     .write_elf64_note = s390_cpu_write_elf64_note,
 163     .legacy_vmsd = &vmstate_s390_cpu,
 164 };
 165
 166 void s390_cpu_class_init_sysemu(CPUClass *cc)
 167 {
 168     S390CPUClass *scc = S390_CPU_CLASS(cc);
 169
 170     scc->load_normal = s390_cpu_load_normal;
 171     cc->sysemu_ops = &s390_sysemu_ops;
 172 }
 173
 174 static bool disabled_wait(CPUState *cpu)
 175 {
 176     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 177                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 178 }
 179
 180 static unsigned s390_count_running_cpus(void)
 181 {
 182     CPUState *cpu;
 183     int nr_running = 0;
 184
 185     CPU_FOREACH(cpu) {
 186         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 187         if (state == S390_CPU_STATE_OPERATING ||
 188             state == S390_CPU_STATE_LOAD) {
 189             if (!disabled_wait(cpu)) {
 190                 nr_running++;
 191             }
 192         }
 193     }
 194
 195     return nr_running;
 196 }
 197
 198 unsigned int s390_cpu_halt(S390CPU *cpu)
 199 {
 200     CPUState *cs = CPU(cpu);
 201     trace_cpu_halt(cs->cpu_index);
 202
 203     if (!cs->halted) {
 204         cs->halted = 1;
 205         cs->exception_index = EXCP_HLT;
 206     }
 207
 208     return s390_count_running_cpus();
 209 }
 210
 211 void s390_cpu_unhalt(S390CPU *cpu)
 212 {
 213     CPUState *cs = CPU(cpu);
 214     trace_cpu_unhalt(cs->cpu_index);
 215
 216     if (cs->halted) {
 217         cs->halted = 0;
 218         cs->exception_index = -1;
 219     }
 220 }
 221
 222 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 223  {
 224     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 225
 226     switch (cpu_state) {
 227     case S390_CPU_STATE_STOPPED:
 228     case S390_CPU_STATE_CHECK_STOP:
 229         /* halt the cpu for common infrastructure */
 230         s390_cpu_halt(cpu);
 231         break;
 232     case S390_CPU_STATE_OPERATING:
 233     case S390_CPU_STATE_LOAD:
 234         /*
 235          * Starting a CPU with a PSW WAIT bit set:
 236          * KVM: handles this internally and triggers another WAIT exit.
 237          * TCG: will actually try to continue to run. Don't unhalt, will
 238          *      be done when the CPU actually has work (an interrupt).
 239          */
 240         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 241             s390_cpu_unhalt(cpu);
 242         }
 243         break;
 244     default:
 245         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 246                      cpu_state);
 247         exit(1);
 248     }
 249     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 250         kvm_s390_set_cpu_state(cpu, cpu_state);
 251     }
 252     cpu->env.cpu_state = cpu_state;
 253
 254     return s390_count_running_cpus();
 255 }
 256
 257 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 258 {
 259     if (kvm_enabled()) {
 260         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 261     }
 262     return 0;
 263 }
 264
 265 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 266 {
 267     if (kvm_enabled()) {
 268         kvm_s390_set_max_pagesize(pagesize, errp);
 269     }
 270 }
 271
 272 void s390_cmma_reset(void)
 273 {
 274     if (kvm_enabled()) {
 275         kvm_s390_cmma_reset();
 276     }
 277 }
 278
 279 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 280                                 int vq, bool assign)
 281 {
 282     if (kvm_enabled()) {
 283         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 284     } else {
 285         return 0;
 286     }
 287 }
 288
 289 void s390_crypto_reset(void)
 290 {
 291     if (kvm_enabled()) {
 292         kvm_s390_crypto_reset();
 293     }
 294 }
 295
 296 void s390_enable_css_support(S390CPU *cpu)
 297 {
 298     if (kvm_enabled()) {
 299         kvm_s390_enable_css_support(cpu);
 300     }
 301 }
 302
 303 void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg)
 304 {
 305     if (kvm_enabled()) {
 306         kvm_s390_set_diag318(cs, arg.host_ulong);
 307     }
 308 }