133 lines
3.1 KiB
C
133 lines
3.1 KiB
C
/*
|
|
* TOD (Time Of Day) clock
|
|
*
|
|
* Copyright 2018 Red Hat, Inc.
|
|
* Author(s): David Hildenbrand <david@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "hw/s390x/tod.h"
|
|
#include "qapi/error.h"
|
|
#include "qemu/error-report.h"
|
|
#include "qemu/module.h"
|
|
#include "sysemu/kvm.h"
|
|
#include "migration/qemu-file-types.h"
|
|
#include "migration/register.h"
|
|
|
|
void s390_init_tod(void)
|
|
{
|
|
Object *obj;
|
|
|
|
if (kvm_enabled()) {
|
|
obj = object_new(TYPE_KVM_S390_TOD);
|
|
} else {
|
|
obj = object_new(TYPE_QEMU_S390_TOD);
|
|
}
|
|
object_property_add_child(qdev_get_machine(), TYPE_S390_TOD, obj, NULL);
|
|
object_unref(obj);
|
|
|
|
qdev_init_nofail(DEVICE(obj));
|
|
}
|
|
|
|
S390TODState *s390_get_todstate(void)
|
|
{
|
|
static S390TODState *ts;
|
|
|
|
if (!ts) {
|
|
ts = S390_TOD(object_resolve_path_type("", TYPE_S390_TOD, NULL));
|
|
}
|
|
|
|
return ts;
|
|
}
|
|
|
|
#define S390_TOD_CLOCK_VALUE_MISSING 0x00
|
|
#define S390_TOD_CLOCK_VALUE_PRESENT 0x01
|
|
|
|
static void s390_tod_save(QEMUFile *f, void *opaque)
|
|
{
|
|
S390TODState *td = opaque;
|
|
S390TODClass *tdc = S390_TOD_GET_CLASS(td);
|
|
Error *err = NULL;
|
|
S390TOD tod;
|
|
|
|
tdc->get(td, &tod, &err);
|
|
if (err) {
|
|
warn_report_err(err);
|
|
error_printf("Guest clock will not be migrated "
|
|
"which could cause the guest to hang.");
|
|
qemu_put_byte(f, S390_TOD_CLOCK_VALUE_MISSING);
|
|
return;
|
|
}
|
|
|
|
qemu_put_byte(f, S390_TOD_CLOCK_VALUE_PRESENT);
|
|
qemu_put_byte(f, tod.high);
|
|
qemu_put_be64(f, tod.low);
|
|
}
|
|
|
|
static int s390_tod_load(QEMUFile *f, void *opaque, int version_id)
|
|
{
|
|
S390TODState *td = opaque;
|
|
S390TODClass *tdc = S390_TOD_GET_CLASS(td);
|
|
Error *err = NULL;
|
|
S390TOD tod;
|
|
|
|
if (qemu_get_byte(f) == S390_TOD_CLOCK_VALUE_MISSING) {
|
|
warn_report("Guest clock was not migrated. This could "
|
|
"cause the guest to hang.");
|
|
return 0;
|
|
}
|
|
|
|
tod.high = qemu_get_byte(f);
|
|
tod.low = qemu_get_be64(f);
|
|
|
|
tdc->set(td, &tod, &err);
|
|
if (err) {
|
|
error_report_err(err);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static SaveVMHandlers savevm_tod = {
|
|
.save_state = s390_tod_save,
|
|
.load_state = s390_tod_load,
|
|
};
|
|
|
|
static void s390_tod_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
S390TODState *td = S390_TOD(dev);
|
|
|
|
/* Legacy migration interface */
|
|
register_savevm_live("todclock", 0, 1, &savevm_tod, td);
|
|
}
|
|
|
|
static void s390_tod_class_init(ObjectClass *oc, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(oc);
|
|
|
|
dc->desc = "TOD (Time Of Day) Clock";
|
|
dc->realize = s390_tod_realize;
|
|
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
|
|
|
|
/* We only have one TOD clock in the system attached to the machine */
|
|
dc->user_creatable = false;
|
|
}
|
|
|
|
static TypeInfo s390_tod_info = {
|
|
.name = TYPE_S390_TOD,
|
|
.parent = TYPE_DEVICE,
|
|
.instance_size = sizeof(S390TODState),
|
|
.class_init = s390_tod_class_init,
|
|
.class_size = sizeof(S390TODClass),
|
|
.abstract = true,
|
|
};
|
|
|
|
static void register_types(void)
|
|
{
|
|
type_register_static(&s390_tod_info);
|
|
}
|
|
type_init(register_types);
|