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>
88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
/*
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* TOD (Time Of Day) clock - QEMU implementation
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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 "qapi/error.h"
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#include "hw/s390x/tod.h"
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#include "qemu/timer.h"
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#include "qemu/cutils.h"
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#include "cpu.h"
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#include "tcg_s390x.h"
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static void qemu_s390_tod_get(const S390TODState *td, S390TOD *tod,
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Error **errp)
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{
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*tod = td->base;
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tod->low += time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
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if (tod->low < td->base.low) {
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tod->high++;
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}
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}
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static void qemu_s390_tod_set(S390TODState *td, const S390TOD *tod,
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Error **errp)
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{
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CPUState *cpu;
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td->base = *tod;
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td->base.low -= time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
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if (td->base.low > tod->low) {
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td->base.high--;
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}
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/*
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* The TOD has been changed and we have to recalculate the CKC values
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* for all CPUs. We do this asynchronously, as "SET CLOCK should be
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* issued only while all other activity on all CPUs .. has been
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* suspended".
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*/
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CPU_FOREACH(cpu) {
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async_run_on_cpu(cpu, tcg_s390_tod_updated, RUN_ON_CPU_NULL);
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}
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}
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static void qemu_s390_tod_class_init(ObjectClass *oc, void *data)
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{
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S390TODClass *tdc = S390_TOD_CLASS(oc);
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tdc->get = qemu_s390_tod_get;
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tdc->set = qemu_s390_tod_set;
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}
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static void qemu_s390_tod_init(Object *obj)
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{
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S390TODState *td = S390_TOD(obj);
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struct tm tm;
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qemu_get_timedate(&tm, 0);
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td->base.high = 0;
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td->base.low = TOD_UNIX_EPOCH + (time2tod(mktimegm(&tm)) * 1000000000ULL);
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if (td->base.low < TOD_UNIX_EPOCH) {
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td->base.high += 1;
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}
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}
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static TypeInfo qemu_s390_tod_info = {
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.name = TYPE_QEMU_S390_TOD,
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.parent = TYPE_S390_TOD,
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.instance_size = sizeof(S390TODState),
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.instance_init = qemu_s390_tod_init,
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.class_init = qemu_s390_tod_class_init,
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.class_size = sizeof(S390TODClass),
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};
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static void register_types(void)
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{
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type_register_static(&qemu_s390_tod_info);
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}
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type_init(register_types);
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