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target/s390x: move sysemu-only code out to cpu-sysemu.c

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move sysemu-only code out to cpu-sysemu.c

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Signed-off-by: Cho, Yu-Chen <acho@suse.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20210707105324.23400-9-acho@suse.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Cho, Yu-Chen 2021-07-07 18:53:18 +08:00 committed by Cornelia Huck
parent c9274b6bf0
commit 72ffb6310b
5 changed files with 327 additions and 278 deletions
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309
target/s390x/cpu-sysemu.c Normal file
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@ -0,0 +1,309 @@
/*
* QEMU S/390 CPU - System Emulation-only code
*
* 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 "s390x-internal.h"
#include "kvm_s390x.h"
#include "sysemu/kvm.h"
#include "sysemu/reset.h"
#include "qemu/timer.h"
#include "trace.h"
#include "qapi/qapi-visit-run-state.h"
#include "sysemu/hw_accel.h"
#include "hw/s390x/pv.h"
#include "hw/boards.h"
#include "sysemu/arch_init.h"
#include "sysemu/sysemu.h"
#include "sysemu/tcg.h"
#include "hw/core/sysemu-cpu-ops.h"
/* 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);
}
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);
}
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);
}
void s390_cpu_init_sysemu(Object *obj)
{
CPUState *cs = CPU(obj);
S390CPU *cpu = S390_CPU(obj);
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);
}
bool s390_cpu_realize_sysemu(DeviceState *dev, Error **errp)
{
S390CPU *cpu = S390_CPU(dev);
MachineState *ms = MACHINE(qdev_get_machine());
unsigned int max_cpus = ms->smp.max_cpus;
if (cpu->env.core_id >= max_cpus) {
error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
", maximum core-id: %d", cpu->env.core_id,
max_cpus - 1);
return false;
}
if (cpu_exists(cpu->env.core_id)) {
error_setg(errp, "Unable to add CPU with core-id: %" PRIu32
", it already exists", cpu->env.core_id);
return false;
}
/* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
CPU(cpu)->cpu_index = cpu->env.core_id;
return true;
}
void s390_cpu_finalize(Object *obj)
{
S390CPU *cpu = S390_CPU(obj);
timer_free(cpu->env.tod_timer);
timer_free(cpu->env.cpu_timer);
qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
g_free(cpu->irqstate);
}
static const struct SysemuCPUOps s390_sysemu_ops = {
.get_phys_page_debug = s390_cpu_get_phys_page_debug,
.get_crash_info = s390_cpu_get_crash_info,
.write_elf64_note = s390_cpu_write_elf64_note,
.legacy_vmsd = &vmstate_s390_cpu,
};
void s390_cpu_class_init_sysemu(CPUClass *cc)
{
S390CPUClass *scc = S390_CPU_CLASS(cc);
scc->load_normal = s390_cpu_load_normal;
cc->sysemu_ops = &s390_sysemu_ops;
}
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);
}
}
void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg)
{
if (kvm_enabled()) {
kvm_s390_set_diag318(cs, arg.host_ulong);
}
}

287
target/s390x/cpu.c
View File

@ -27,21 +27,11 @@
#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/tcg.h"
#endif
#include "fpu/softfloat-helpers.h"
#include "disas/capstone.h"
@ -72,33 +62,6 @@ static bool s390_cpu_has_work(CPUState *cs)
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)
{
@ -169,15 +132,6 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
}
}
#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;
@ -191,9 +145,6 @@ 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 */
@ -203,23 +154,9 @@ static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
}
#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);
if (!s390_cpu_realize_sysemu(dev, &err)) {
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);
@ -228,7 +165,7 @@ static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
}
#if !defined(CONFIG_USER_ONLY)
qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
qemu_register_reset(s390_cpu_machine_reset_cb, S390_CPU(dev));
#endif
s390_cpu_gdb_init(cs);
qemu_init_vcpu(cs);
@ -250,44 +187,6 @@ 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);
@ -295,168 +194,11 @@ static void s390_cpu_initfn(Object *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
}
static void s390_cpu_finalize(Object *obj)
{
#if !defined(CONFIG_USER_ONLY)
S390CPU *cpu = S390_CPU(obj);
timer_free(cpu->env.tod_timer);
timer_free(cpu->env.cpu_timer);
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);
}
}
void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg)
{
if (kvm_enabled()) {
kvm_s390_set_diag318(cs, arg.host_ulong);
}
}
s390_cpu_init_sysemu(obj);
#endif
}
static gchar *s390_gdb_arch_name(CPUState *cs)
{
@ -476,17 +218,6 @@ static void s390_cpu_reset_full(DeviceState *dev)
return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
}
#ifndef CONFIG_USER_ONLY
#include "hw/core/sysemu-cpu-ops.h"
static const struct SysemuCPUOps s390_sysemu_ops = {
.get_phys_page_debug = s390_cpu_get_phys_page_debug,
.get_crash_info = s390_cpu_get_crash_info,
.write_elf64_note = s390_cpu_write_elf64_note,
.legacy_vmsd = &vmstate_s390_cpu,
};
#endif
#ifdef CONFIG_TCG
#include "hw/core/tcg-cpu-ops.h"
@ -515,9 +246,7 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
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;
@ -526,7 +255,7 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
cc->gdb_read_register = s390_cpu_gdb_read_register;
cc->gdb_write_register = s390_cpu_gdb_write_register;
#ifndef CONFIG_USER_ONLY
cc->sysemu_ops = &s390_sysemu_ops;
s390_cpu_class_init_sysemu(cc);
#endif
cc->disas_set_info = s390_cpu_disas_set_info;
cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
@ -546,7 +275,11 @@ static const TypeInfo s390_cpu_type_info = {
.instance_size = sizeof(S390CPU),
.instance_align = __alignof__(S390CPU),
.instance_init = s390_cpu_initfn,
#ifndef CONFIG_USER_ONLY
.instance_finalize = s390_cpu_finalize,
#endif /* !CONFIG_USER_ONLY */
.abstract = true,
.class_size = sizeof(S390CPUClass),
.class_init = s390_cpu_class_init,

1
target/s390x/meson.build
View File

@ -28,6 +28,7 @@ s390x_softmmu_ss.add(files(
'machine.c',
'mmu_helper.c',
'sigp.c',
'cpu-sysemu.c',
))
# Newer kernels on s390 check for an S390_PGSTE program header and

6
target/s390x/s390x-internal.h
View File

@ -240,6 +240,12 @@ uint32_t calc_cc(CPUS390XState *env, uint32_t cc_op, uint64_t src, uint64_t dst,
#ifndef CONFIG_USER_ONLY
unsigned int s390_cpu_halt(S390CPU *cpu);
void s390_cpu_unhalt(S390CPU *cpu);
void s390_cpu_init_sysemu(Object *obj);
bool s390_cpu_realize_sysemu(DeviceState *dev, Error **errp);
void s390_cpu_finalize(Object *obj);
void s390_cpu_class_init_sysemu(CPUClass *cc);
void s390_cpu_machine_reset_cb(void *opaque);
#else
static inline unsigned int s390_cpu_halt(S390CPU *cpu)
{

2
target/s390x/trace-events
View File

@ -16,7 +16,7 @@ kvm_clear_cmma(int rc) "CMMA: clearing with result code %d"
kvm_failed_cpu_state_set(int cpu_index, uint8_t state, const char *msg) "Warning: Unable to set cpu %d state %" PRIu8 " to KVM: %s"
kvm_assign_subch_ioeventfd(int fd, uint32_t addr, bool assign, int datamatch) "fd: %d sch: @0x%x assign: %d vq: %d"
# cpu.c
# cpu-sysemu.c
cpu_set_state(int cpu_index, uint8_t state) "setting cpu %d state to %" PRIu8
cpu_halt(int cpu_index) "halting cpu %d"
cpu_unhalt(int cpu_index) "unhalting cpu %d"