173 lines
4.7 KiB
C
173 lines
4.7 KiB
C
/*
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* TOD (Time Of Day) clock - KVM 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 "qemu/module.h"
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#include "sysemu/runstate.h"
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#include "hw/s390x/tod.h"
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#include "hw/s390x/pv.h"
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#include "kvm/kvm_s390x.h"
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static void kvm_s390_get_tod_raw(S390TOD *tod, Error **errp)
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{
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int r;
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r = kvm_s390_get_clock_ext(&tod->high, &tod->low);
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if (r == -ENXIO) {
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r = kvm_s390_get_clock(&tod->high, &tod->low);
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}
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if (r) {
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error_setg(errp, "Unable to get KVM guest TOD clock: %s",
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strerror(-r));
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}
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}
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static void kvm_s390_tod_get(const S390TODState *td, S390TOD *tod, Error **errp)
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{
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if (td->stopped) {
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*tod = td->base;
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return;
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}
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kvm_s390_get_tod_raw(tod, errp);
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}
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static void kvm_s390_set_tod_raw(const S390TOD *tod, Error **errp)
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{
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int r;
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r = kvm_s390_set_clock_ext(tod->high, tod->low);
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if (r == -ENXIO) {
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r = kvm_s390_set_clock(tod->high, tod->low);
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}
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if (r) {
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error_setg(errp, "Unable to set KVM guest TOD clock: %s",
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strerror(-r));
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}
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}
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static void kvm_s390_tod_set(S390TODState *td, const S390TOD *tod, Error **errp)
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{
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Error *local_err = NULL;
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/*
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* Somebody (e.g. migration) set the TOD. We'll store it into KVM to
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* properly detect errors now but take a look at the runstate to decide
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* whether really to keep the tod running. E.g. during migration, this
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* is the point where we want to stop the initially running TOD to fire
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* it back up when actually starting the migrated guest.
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*/
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kvm_s390_set_tod_raw(tod, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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if (runstate_is_running()) {
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td->stopped = false;
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} else {
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td->stopped = true;
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td->base = *tod;
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}
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}
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static void kvm_s390_tod_vm_state_change(void *opaque, bool running,
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RunState state)
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{
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S390TODState *td = opaque;
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Error *local_err = NULL;
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/*
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* Under PV, the clock is under ultravisor control, hence we cannot restore
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* it on resume.
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*/
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if (s390_is_pv()) {
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return;
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}
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if (running && td->stopped) {
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/* Set the old TOD when running the VM - start the TOD clock. */
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kvm_s390_set_tod_raw(&td->base, &local_err);
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if (local_err) {
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warn_report_err(local_err);
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}
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/* Treat errors like the TOD was running all the time. */
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td->stopped = false;
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} else if (!running && !td->stopped) {
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/* Store the TOD when stopping the VM - stop the TOD clock. */
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kvm_s390_get_tod_raw(&td->base, &local_err);
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if (local_err) {
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/* Keep the TOD running in case we could not back it up. */
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warn_report_err(local_err);
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} else {
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td->stopped = true;
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}
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}
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}
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static void kvm_s390_tod_realize(DeviceState *dev, Error **errp)
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{
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S390TODState *td = S390_TOD(dev);
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S390TODClass *tdc = S390_TOD_GET_CLASS(td);
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Error *local_err = NULL;
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tdc->parent_realize(dev, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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/*
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* We need to know when the VM gets started/stopped to start/stop the TOD.
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* As we can never have more than one TOD instance (and that will never be
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* removed), registering here and never unregistering is good enough.
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*/
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qemu_add_vm_change_state_handler(kvm_s390_tod_vm_state_change, td);
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}
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static void kvm_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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device_class_set_parent_realize(DEVICE_CLASS(oc), kvm_s390_tod_realize,
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&tdc->parent_realize);
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tdc->get = kvm_s390_tod_get;
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tdc->set = kvm_s390_tod_set;
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}
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static void kvm_s390_tod_init(Object *obj)
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{
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S390TODState *td = S390_TOD(obj);
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/*
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* The TOD is initially running (value stored in KVM). Avoid needless
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* loading/storing of the TOD when starting a simple VM, so let it
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* run although the (never started) VM is stopped. For migration, we
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* will properly set the TOD later.
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*/
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td->stopped = false;
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}
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static const TypeInfo kvm_s390_tod_info = {
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.name = TYPE_KVM_S390_TOD,
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.parent = TYPE_S390_TOD,
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.instance_size = sizeof(S390TODState),
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.instance_init = kvm_s390_tod_init,
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.class_init = kvm_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(&kvm_s390_tod_info);
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}
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type_init(register_types);
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