2021-07-07 13:53:18 +03:00
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/*
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* QEMU S/390 CPU - System Emulation-only code
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*
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* Copyright (c) 2009 Ulrich Hecht
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* Copyright (c) 2011 Alexander Graf
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* Copyright (c) 2012 SUSE LINUX Products GmbH
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* Copyright (c) 2012 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "cpu.h"
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#include "s390x-internal.h"
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2021-07-07 13:53:23 +03:00
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#include "kvm/kvm_s390x.h"
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2021-07-07 13:53:18 +03:00
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#include "sysemu/kvm.h"
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#include "sysemu/reset.h"
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#include "qemu/timer.h"
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#include "trace.h"
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#include "qapi/qapi-visit-run-state.h"
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#include "sysemu/hw_accel.h"
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#include "hw/s390x/pv.h"
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#include "hw/boards.h"
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#include "sysemu/arch_init.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/tcg.h"
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#include "hw/core/sysemu-cpu-ops.h"
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/* S390CPUClass::load_normal() */
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static void s390_cpu_load_normal(CPUState *s)
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{
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S390CPU *cpu = S390_CPU(s);
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uint64_t spsw;
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if (!s390_is_pv()) {
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spsw = ldq_phys(s->as, 0);
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cpu->env.psw.mask = spsw & PSW_MASK_SHORT_CTRL;
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/*
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* Invert short psw indication, so SIE will report a specification
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* exception if it was not set.
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*/
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cpu->env.psw.mask ^= PSW_MASK_SHORTPSW;
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cpu->env.psw.addr = spsw & PSW_MASK_SHORT_ADDR;
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} else {
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/*
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* Firmware requires us to set the load state before we set
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* the cpu to operating on protected guests.
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*/
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s390_cpu_set_state(S390_CPU_STATE_LOAD, cpu);
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}
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s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
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}
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void s390_cpu_machine_reset_cb(void *opaque)
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{
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S390CPU *cpu = opaque;
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run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
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}
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static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
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{
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GuestPanicInformation *panic_info;
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S390CPU *cpu = S390_CPU(cs);
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cpu_synchronize_state(cs);
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panic_info = g_malloc0(sizeof(GuestPanicInformation));
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panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
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panic_info->u.s390.core = cpu->env.core_id;
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panic_info->u.s390.psw_mask = cpu->env.psw.mask;
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panic_info->u.s390.psw_addr = cpu->env.psw.addr;
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panic_info->u.s390.reason = cpu->env.crash_reason;
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return panic_info;
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}
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static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
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const char *name, void *opaque,
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Error **errp)
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{
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CPUState *cs = CPU(obj);
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GuestPanicInformation *panic_info;
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if (!cs->crash_occurred) {
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error_setg(errp, "No crash occurred");
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return;
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}
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panic_info = s390_cpu_get_crash_info(cs);
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visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
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errp);
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qapi_free_GuestPanicInformation(panic_info);
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}
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void s390_cpu_init_sysemu(Object *obj)
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{
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CPUState *cs = CPU(obj);
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S390CPU *cpu = S390_CPU(obj);
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cs->start_powered_off = true;
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object_property_add(obj, "crash-information", "GuestPanicInformation",
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s390_cpu_get_crash_info_qom, NULL, NULL, NULL);
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cpu->env.tod_timer =
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timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
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cpu->env.cpu_timer =
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timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
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s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
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}
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bool s390_cpu_realize_sysemu(DeviceState *dev, Error **errp)
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{
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S390CPU *cpu = S390_CPU(dev);
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MachineState *ms = MACHINE(qdev_get_machine());
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unsigned int max_cpus = ms->smp.max_cpus;
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if (cpu->env.core_id >= max_cpus) {
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error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
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", maximum core-id: %d", cpu->env.core_id,
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max_cpus - 1);
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return false;
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}
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if (cpu_exists(cpu->env.core_id)) {
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error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
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", it already exists", cpu->env.core_id);
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return false;
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}
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/* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
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CPU(cpu)->cpu_index = cpu->env.core_id;
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return true;
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}
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void s390_cpu_finalize(Object *obj)
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{
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S390CPU *cpu = S390_CPU(obj);
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timer_free(cpu->env.tod_timer);
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timer_free(cpu->env.cpu_timer);
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qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
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g_free(cpu->irqstate);
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}
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static const struct SysemuCPUOps s390_sysemu_ops = {
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.get_phys_page_debug = s390_cpu_get_phys_page_debug,
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.get_crash_info = s390_cpu_get_crash_info,
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.write_elf64_note = s390_cpu_write_elf64_note,
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.legacy_vmsd = &vmstate_s390_cpu,
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};
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void s390_cpu_class_init_sysemu(CPUClass *cc)
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{
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S390CPUClass *scc = S390_CPU_CLASS(cc);
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scc->load_normal = s390_cpu_load_normal;
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cc->sysemu_ops = &s390_sysemu_ops;
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}
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static bool disabled_wait(CPUState *cpu)
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{
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return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
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(PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
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}
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static unsigned s390_count_running_cpus(void)
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{
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CPUState *cpu;
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int nr_running = 0;
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CPU_FOREACH(cpu) {
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uint8_t state = S390_CPU(cpu)->env.cpu_state;
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if (state == S390_CPU_STATE_OPERATING ||
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state == S390_CPU_STATE_LOAD) {
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if (!disabled_wait(cpu)) {
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nr_running++;
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}
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}
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}
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return nr_running;
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}
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unsigned int s390_cpu_halt(S390CPU *cpu)
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{
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CPUState *cs = CPU(cpu);
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trace_cpu_halt(cs->cpu_index);
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if (!cs->halted) {
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cs->halted = 1;
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cs->exception_index = EXCP_HLT;
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}
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return s390_count_running_cpus();
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}
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void s390_cpu_unhalt(S390CPU *cpu)
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{
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CPUState *cs = CPU(cpu);
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trace_cpu_unhalt(cs->cpu_index);
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if (cs->halted) {
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cs->halted = 0;
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cs->exception_index = -1;
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}
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}
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unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
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{
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trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
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switch (cpu_state) {
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case S390_CPU_STATE_STOPPED:
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case S390_CPU_STATE_CHECK_STOP:
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/* halt the cpu for common infrastructure */
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s390_cpu_halt(cpu);
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break;
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case S390_CPU_STATE_OPERATING:
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case S390_CPU_STATE_LOAD:
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/*
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* Starting a CPU with a PSW WAIT bit set:
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* KVM: handles this internally and triggers another WAIT exit.
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* TCG: will actually try to continue to run. Don't unhalt, will
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* be done when the CPU actually has work (an interrupt).
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*/
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if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
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s390_cpu_unhalt(cpu);
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}
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break;
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default:
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error_report("Requested CPU state is not a valid S390 CPU state: %u",
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cpu_state);
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exit(1);
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}
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if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
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kvm_s390_set_cpu_state(cpu, cpu_state);
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}
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cpu->env.cpu_state = cpu_state;
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return s390_count_running_cpus();
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}
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int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
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{
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if (kvm_enabled()) {
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return kvm_s390_set_mem_limit(new_limit, hw_limit);
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}
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return 0;
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}
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void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
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{
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if (kvm_enabled()) {
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kvm_s390_set_max_pagesize(pagesize, errp);
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}
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}
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void s390_cmma_reset(void)
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{
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if (kvm_enabled()) {
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kvm_s390_cmma_reset();
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}
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}
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int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
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int vq, bool assign)
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{
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if (kvm_enabled()) {
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return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
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} else {
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return 0;
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}
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}
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void s390_crypto_reset(void)
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{
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if (kvm_enabled()) {
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kvm_s390_crypto_reset();
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}
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}
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void s390_enable_css_support(S390CPU *cpu)
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{
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if (kvm_enabled()) {
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kvm_s390_enable_css_support(cpu);
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}
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}
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void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg)
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{
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if (kvm_enabled()) {
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kvm_s390_set_diag318(cs, arg.host_ulong);
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}
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}
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