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0754f60429
qemu/target-s390x/cpu.c
David Hildenbrand 0754f60429 s390x/cpumodel: expose features and feature groups as properties 
Let's add all features and feature groups as properties to all CPU models.
If the "host" CPU model is unknown, we can neither query nor change
features. KVM will just continue to work like it did until now.

We will not allow to enable features that were not part of the original
CPU model, because that could collide with the IBC in KVM.

Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Message-Id: <20160905085244.99980-11-dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2016-09-06 17:06:50 +02:00

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/*
* 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 library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/lgpl-2.1.html>
* Contributions after 2012-12-11 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "cpu.h"
#include "qemu-common.h"
#include "qemu/cutils.h"
#include "qemu/timer.h"
#include "qemu/error-report.h"
#include "trace.h"
#include "qapi/visitor.h"
#include "migration/vmstate.h"
#include "exec/exec-all.h"
#ifndef CONFIG_USER_ONLY
#include "hw/hw.h"
#include "sysemu/arch_init.h"
#include "sysemu/sysemu.h"
#include "hw/s390x/sclp.h"
#endif
#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);
CPUS390XState *env = &cpu->env;
return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
(env->psw.mask & PSW_MASK_EXT);
}
#if !defined(CONFIG_USER_ONLY)
/* S390CPUClass::load_normal() */
static void s390_cpu_load_normal(CPUState *s)
{
S390CPU *cpu = S390_CPU(s);
cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
}
#endif
/* S390CPUClass::cpu_reset() */
static void s390_cpu_reset(CPUState *s)
{
S390CPU *cpu = S390_CPU(s);
S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
CPUS390XState *env = &cpu->env;
env->pfault_token = -1UL;
scc->parent_reset(s);
cpu->env.sigp_order = 0;
s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
tlb_flush(s, 1);
}
/* S390CPUClass::initial_reset() */
static void s390_cpu_initial_reset(CPUState *s)
{
S390CPU *cpu = S390_CPU(s);
CPUS390XState *env = &cpu->env;
int i;
s390_cpu_reset(s);
/* initial reset does not touch regs,fregs and aregs */
memset(&env->fpc, 0, offsetof(CPUS390XState, cpu_num) -
offsetof(CPUS390XState, fpc));
/* architectured initial values for CR 0 and 14 */
env->cregs[0] = CR0_RESET;
env->cregs[14] = CR14_RESET;
/* architectured initial value for Breaking-Event-Address register */
env->gbea = 1;
env->pfault_token = -1UL;
env->ext_index = -1;
for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
env->io_index[i] = -1;
}
/* tininess for underflow is detected before rounding */
set_float_detect_tininess(float_tininess_before_rounding,
&env->fpu_status);
/* Reset state inside the kernel that we cannot access yet from QEMU. */
if (kvm_enabled()) {
kvm_s390_reset_vcpu(cpu);
}
tlb_flush(s, 1);
}
/* CPUClass:reset() */
static void s390_cpu_full_reset(CPUState *s)
{
S390CPU *cpu = S390_CPU(s);
S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
CPUS390XState *env = &cpu->env;
int i;
scc->parent_reset(s);
cpu->env.sigp_order = 0;
s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
memset(env, 0, offsetof(CPUS390XState, cpu_num));
/* architectured initial values for CR 0 and 14 */
env->cregs[0] = CR0_RESET;
env->cregs[14] = CR14_RESET;
/* architectured initial value for Breaking-Event-Address register */
env->gbea = 1;
env->pfault_token = -1UL;
env->ext_index = -1;
for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
env->io_index[i] = -1;
}
/* tininess for underflow is detected before rounding */
set_float_detect_tininess(float_tininess_before_rounding,
&env->fpu_status);
/* Reset state inside the kernel that we cannot access yet from QEMU. */
if (kvm_enabled()) {
kvm_s390_reset_vcpu(cpu);
}
tlb_flush(s, 1);
}
#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, CPU(cpu));
}
#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);
S390CPU *cpu = S390_CPU(dev);
CPUS390XState *env = &cpu->env;
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)
if (cpu->id >= max_cpus) {
error_setg(&err, "Unable to add CPU: %" PRIi64
", max allowed: %d", cpu->id, max_cpus - 1);
goto out;
}
#endif
if (cpu_exists(cpu->id)) {
error_setg(&err, "Unable to add CPU: %" PRIi64
", it already exists", cpu->id);
goto out;
}
if (cpu->id != scc->next_cpu_id) {
error_setg(&err, "Unable to add CPU: %" PRIi64
", The next available id is %" PRIi64, cpu->id,
scc->next_cpu_id);
goto out;
}
cpu_exec_init(cs, &err);
if (err != NULL) {
goto out;
}
scc->next_cpu_id++;
#if !defined(CONFIG_USER_ONLY)
qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
#endif
env->cpu_num = cpu->id;
s390_cpu_gdb_init(cs);
qemu_init_vcpu(cs);
#if !defined(CONFIG_USER_ONLY)
run_on_cpu(cs, s390_do_cpu_full_reset, cs);
#else
cpu_reset(cs);
#endif
scc->parent_realize(dev, &err);
#if !defined(CONFIG_USER_ONLY)
if (dev->hotplugged) {
raise_irq_cpu_hotplug();
}
#endif
out:
error_propagate(errp, err);
}
static void s390x_cpu_get_id(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
S390CPU *cpu = S390_CPU(obj);
int64_t value = cpu->id;
visit_type_int(v, name, &value, errp);
}
static void s390x_cpu_set_id(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
S390CPU *cpu = S390_CPU(obj);
DeviceState *dev = DEVICE(obj);
const int64_t min = 0;
const int64_t max = UINT32_MAX;
Error *err = NULL;
int64_t value;
if (dev->realized) {
error_setg(errp, "Attempt to set property '%s' on '%s' after "
"it was realized", name, object_get_typename(obj));
return;
}
visit_type_int(v, name, &value, &err);
if (err) {
error_propagate(errp, err);
return;
}
if (value < min || value > max) {
error_setg(errp, "Property %s.%s doesn't take value %" PRId64
" (minimum: %" PRId64 ", maximum: %" PRId64 ")" ,
object_get_typename(obj), name, value, min, max);
return;
}
cpu->id = value;
}
static void s390_cpu_initfn(Object *obj)
{
CPUState *cs = CPU(obj);
S390CPU *cpu = S390_CPU(obj);
CPUS390XState *env = &cpu->env;
static bool inited;
#if !defined(CONFIG_USER_ONLY)
struct tm tm;
#endif
cs->env_ptr = env;
cs->halted = 1;
cs->exception_index = EXCP_HLT;
object_property_add(OBJECT(cpu), "id", "int64_t", s390x_cpu_get_id,
s390x_cpu_set_id, NULL, NULL, NULL);
s390_cpu_model_register_props(obj);
#if !defined(CONFIG_USER_ONLY)
qemu_get_timedate(&tm, 0);
env->tod_offset = TOD_UNIX_EPOCH +
(time2tod(mktimegm(&tm)) * 1000000000ULL);
env->tod_basetime = 0;
env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
#endif
if (tcg_enabled() && !inited) {
inited = true;
s390x_translate_init();
}
}
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 == CPU_STATE_OPERATING ||
state == 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 CPU_STATE_STOPPED:
case CPU_STATE_CHECK_STOP:
/* halt the cpu for common infrastructure */
s390_cpu_halt(cpu);
break;
case CPU_STATE_OPERATING:
case CPU_STATE_LOAD:
/* unhalt the cpu for common infrastructure */
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();
}
#endif
static gchar *s390_gdb_arch_name(CPUState *cs)
{
return g_strdup("s390:64-bit");
}
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);
scc->next_cpu_id = 0;
scc->parent_realize = dc->realize;
dc->realize = s390_cpu_realizefn;
scc->parent_reset = cc->reset;
#if !defined(CONFIG_USER_ONLY)
scc->load_normal = s390_cpu_load_normal;
#endif
scc->cpu_reset = s390_cpu_reset;
scc->initial_cpu_reset = s390_cpu_initial_reset;
cc->reset = s390_cpu_full_reset;
cc->class_by_name = s390_cpu_class_by_name,
cc->has_work = s390_cpu_has_work;
cc->do_interrupt = s390_cpu_do_interrupt;
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;
#ifdef CONFIG_USER_ONLY
cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
#else
cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
cc->vmsd = &vmstate_s390_cpu;
cc->write_elf64_note = s390_cpu_write_elf64_note;
cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
#endif
cc->disas_set_info = s390_cpu_disas_set_info;
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;
/*
* Reason: s390_cpu_realizefn() calls cpu_exec_init(), which saves
* the object in cpus -> dangling pointer after final
* object_unref().
*/
dc->cannot_destroy_with_object_finalize_yet = true;
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_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)
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