qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
Log | Files | Refs | Submodules | LICENSE

tod.c (3447B)

      1 /*
      2  * TOD (Time Of Day) clock
      3  *
      4  * Copyright 2018 Red Hat, Inc.
      5  * Author(s): David Hildenbrand <david@redhat.com>
      6  *
      7  * This work is licensed under the terms of the GNU GPL, version 2 or later.
      8  * See the COPYING file in the top-level directory.
      9  */
     10 
     11 #include "qemu/osdep.h"
     12 #include "hw/s390x/tod.h"
     13 #include "qapi/error.h"
     14 #include "qemu/error-report.h"
     15 #include "qemu/module.h"
     16 #include "sysemu/kvm.h"
     17 #include "sysemu/tcg.h"
     18 #include "sysemu/qtest.h"
     19 #include "migration/qemu-file-types.h"
     20 #include "migration/register.h"
     21 
     22 void s390_init_tod(void)
     23 {
     24     Object *obj;
     25 
     26     if (kvm_enabled()) {
     27         obj = object_new(TYPE_KVM_S390_TOD);
     28     } else if (tcg_enabled()) {
     29         obj = object_new(TYPE_QEMU_S390_TOD);
     30     } else if (qtest_enabled()) {
     31         return;
     32     } else {
     33         error_report("current accelerator not handled in s390_init_tod!");
     34         abort();
     35     }
     36     object_property_add_child(qdev_get_machine(), TYPE_S390_TOD, obj);
     37     object_unref(obj);
     38 
     39     qdev_realize(DEVICE(obj), NULL, &error_fatal);
     40 }
     41 
     42 S390TODState *s390_get_todstate(void)
     43 {
     44     static S390TODState *ts;
     45 
     46     if (!ts) {
     47         ts = S390_TOD(object_resolve_path_type("", TYPE_S390_TOD, NULL));
     48     }
     49 
     50     return ts;
     51 }
     52 
     53 #define S390_TOD_CLOCK_VALUE_MISSING    0x00
     54 #define S390_TOD_CLOCK_VALUE_PRESENT    0x01
     55 
     56 static void s390_tod_save(QEMUFile *f, void *opaque)
     57 {
     58     S390TODState *td = opaque;
     59     S390TODClass *tdc = S390_TOD_GET_CLASS(td);
     60     Error *err = NULL;
     61     S390TOD tod;
     62 
     63     tdc->get(td, &tod, &err);
     64     if (err) {
     65         warn_report_err(err);
     66         error_printf("Guest clock will not be migrated "
     67                      "which could cause the guest to hang.");
     68         qemu_put_byte(f, S390_TOD_CLOCK_VALUE_MISSING);
     69         return;
     70     }
     71 
     72     qemu_put_byte(f, S390_TOD_CLOCK_VALUE_PRESENT);
     73     qemu_put_byte(f, tod.high);
     74     qemu_put_be64(f, tod.low);
     75 }
     76 
     77 static int s390_tod_load(QEMUFile *f, void *opaque, int version_id)
     78 {
     79     S390TODState *td = opaque;
     80     S390TODClass *tdc = S390_TOD_GET_CLASS(td);
     81     Error *err = NULL;
     82     S390TOD tod;
     83 
     84     if (qemu_get_byte(f) == S390_TOD_CLOCK_VALUE_MISSING) {
     85         warn_report("Guest clock was not migrated. This could "
     86                     "cause the guest to hang.");
     87         return 0;
     88     }
     89 
     90     tod.high = qemu_get_byte(f);
     91     tod.low = qemu_get_be64(f);
     92 
     93     tdc->set(td, &tod, &err);
     94     if (err) {
     95         error_report_err(err);
     96         return -1;
     97     }
     98     return 0;
     99 }
    100 
    101 static SaveVMHandlers savevm_tod = {
    102     .save_state = s390_tod_save,
    103     .load_state = s390_tod_load,
    104 };
    105 
    106 static void s390_tod_realize(DeviceState *dev, Error **errp)
    107 {
    108     S390TODState *td = S390_TOD(dev);
    109 
    110     /* Legacy migration interface */
    111     register_savevm_live("todclock", 0, 1, &savevm_tod, td);
    112 }
    113 
    114 static void s390_tod_class_init(ObjectClass *oc, void *data)
    115 {
    116     DeviceClass *dc = DEVICE_CLASS(oc);
    117 
    118     dc->desc = "TOD (Time Of Day) Clock";
    119     dc->realize = s390_tod_realize;
    120     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
    121 
    122     /* We only have one TOD clock in the system attached to the machine */
    123     dc->user_creatable = false;
    124 }
    125 
    126 static const TypeInfo s390_tod_info = {
    127     .name = TYPE_S390_TOD,
    128     .parent = TYPE_DEVICE,
    129     .instance_size = sizeof(S390TODState),
    130     .class_init = s390_tod_class_init,
    131     .class_size = sizeof(S390TODClass),
    132     .abstract = true,
    133 };
    134 
    135 static void register_types(void)
    136 {
    137     type_register_static(&s390_tod_info);
    138 }
    139 type_init(register_types);