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7de3b1cdc6
Right now, each CPU has its own TOD. Especially, the TOD will differ based on creation time of a CPU - e.g. when hotplugging a CPU the times will differ quite a lot, resulting in stall warnings in the guest. Let's use a single TOD by implementing our new TOD device. Prepare it for TOD-clock epoch extension. Most importantly, whenever we set the TOD, we have to update the CKC timer. Introduce "tcg_s390x.h" just like "kvm_s390x.h" for tcg specific function declarations that should not go into cpu.h. Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20180627134410.4901-6-david@redhat.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/*
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* TOD (Time Of Day) clock
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*
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* Copyright 2018 Red Hat, Inc.
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* Author(s): David Hildenbrand <david@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "hw/s390x/tod.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "sysemu/kvm.h"
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#include "migration/register.h"
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void s390_init_tod(void)
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{
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Object *obj;
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if (kvm_enabled()) {
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obj = object_new(TYPE_KVM_S390_TOD);
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} else {
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obj = object_new(TYPE_QEMU_S390_TOD);
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}
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object_property_add_child(qdev_get_machine(), TYPE_S390_TOD, obj, NULL);
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object_unref(obj);
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qdev_init_nofail(DEVICE(obj));
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}
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S390TODState *s390_get_todstate(void)
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{
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static S390TODState *ts;
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if (!ts) {
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ts = S390_TOD(object_resolve_path_type("", TYPE_S390_TOD, NULL));
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}
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return ts;
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}
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#define S390_TOD_CLOCK_VALUE_MISSING 0x00
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#define S390_TOD_CLOCK_VALUE_PRESENT 0x01
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static void s390_tod_save(QEMUFile *f, void *opaque)
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{
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S390TODState *td = opaque;
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S390TODClass *tdc = S390_TOD_GET_CLASS(td);
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Error *err = NULL;
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S390TOD tod;
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tdc->get(td, &tod, &err);
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if (err) {
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warn_report_err(err);
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error_printf("Guest clock will not be migrated "
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"which could cause the guest to hang.");
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qemu_put_byte(f, S390_TOD_CLOCK_VALUE_MISSING);
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return;
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}
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qemu_put_byte(f, S390_TOD_CLOCK_VALUE_PRESENT);
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qemu_put_byte(f, tod.high);
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qemu_put_be64(f, tod.low);
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}
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static int s390_tod_load(QEMUFile *f, void *opaque, int version_id)
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{
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S390TODState *td = opaque;
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S390TODClass *tdc = S390_TOD_GET_CLASS(td);
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Error *err = NULL;
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S390TOD tod;
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if (qemu_get_byte(f) == S390_TOD_CLOCK_VALUE_MISSING) {
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warn_report("Guest clock was not migrated. This could "
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"cause the guest to hang.");
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return 0;
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}
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tod.high = qemu_get_byte(f);
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tod.low = qemu_get_be64(f);
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tdc->set(td, &tod, &err);
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if (err) {
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error_report_err(err);
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return -1;
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}
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return 0;
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}
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static SaveVMHandlers savevm_tod = {
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.save_state = s390_tod_save,
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.load_state = s390_tod_load,
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};
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static void s390_tod_realize(DeviceState *dev, Error **errp)
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{
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S390TODState *td = S390_TOD(dev);
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/* Legacy migration interface */
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register_savevm_live(NULL, "todclock", 0, 1, &savevm_tod, td);
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}
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static void s390_tod_class_init(ObjectClass *oc, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(oc);
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dc->desc = "TOD (Time Of Day) Clock";
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dc->realize = s390_tod_realize;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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/* We only have one TOD clock in the system attached to the machine */
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dc->user_creatable = false;
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}
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static TypeInfo s390_tod_info = {
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.name = TYPE_S390_TOD,
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.parent = TYPE_DEVICE,
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.instance_size = sizeof(S390TODState),
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.class_init = s390_tod_class_init,
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.class_size = sizeof(S390TODClass),
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.abstract = true,
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};
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static void register_types(void)
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{
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type_register_static(&s390_tod_info);
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}
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type_init(register_types);
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