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/*
* 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 "qemu/error-report.h"
#include "qapi/error.h"
#include "cpu.h"
#include "s390x-internal.h"
#include "kvm/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 "target/s390x/kvm/pv.h"
#include "hw/boards.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_new0(GuestPanicInformation, 1);
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);
}
}
void s390_cpu_topology_set_changed(bool changed)
{
int ret;
if (kvm_enabled()) {
ret = kvm_s390_topology_set_mtcr(changed);
if (ret) {
error_report("Failed to set Modified Topology Change Report: %s",
strerror(-ret));
}
}
}