/* * 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 "sysemu/kvm.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(NULL, "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);