#include "qemu/osdep.h"
#include "qapi/error.h"
+#include "sysemu/sysemu.h"
#include "hw/s390x/tod.h"
#include "kvm_s390x.h"
-static void kvm_s390_tod_get(const S390TODState *td, S390TOD *tod, Error **errp)
+static void kvm_s390_get_tod_raw(S390TOD *tod, Error **errp)
{
int r;
}
}
-static void kvm_s390_tod_set(S390TODState *td, const S390TOD *tod, Error **errp)
+static void kvm_s390_tod_get(const S390TODState *td, S390TOD *tod, Error **errp)
+{
+ if (td->stopped) {
+ *tod = td->base;
+ return;
+ }
+
+ kvm_s390_get_tod_raw(tod, errp);
+}
+
+static void kvm_s390_set_tod_raw(const S390TOD *tod, Error **errp)
{
int r;
}
}
+static void kvm_s390_tod_set(S390TODState *td, const S390TOD *tod, Error **errp)
+{
+ Error *local_err = NULL;
+
+ /*
+ * Somebody (e.g. migration) set the TOD. We'll store it into KVM to
+ * properly detect errors now but take a look at the runstate to decide
+ * whether really to keep the tod running. E.g. during migration, this
+ * is the point where we want to stop the initially running TOD to fire
+ * it back up when actually starting the migrated guest.
+ */
+ kvm_s390_set_tod_raw(tod, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ if (runstate_is_running()) {
+ td->stopped = false;
+ } else {
+ td->stopped = true;
+ td->base = *tod;
+ }
+}
+
+static void kvm_s390_tod_vm_state_change(void *opaque, int running,
+ RunState state)
+{
+ S390TODState *td = opaque;
+ Error *local_err = NULL;
+
+ if (running && td->stopped) {
+ /* Set the old TOD when running the VM - start the TOD clock. */
+ kvm_s390_set_tod_raw(&td->base, &local_err);
+ if (local_err) {
+ warn_report_err(local_err);
+ }
+ /* Treat errors like the TOD was running all the time. */
+ td->stopped = false;
+ } else if (!running && !td->stopped) {
+ /* Store the TOD when stopping the VM - stop the TOD clock. */
+ kvm_s390_get_tod_raw(&td->base, &local_err);
+ if (local_err) {
+ /* Keep the TOD running in case we could not back it up. */
+ warn_report_err(local_err);
+ } else {
+ td->stopped = true;
+ }
+ }
+}
+
+static void kvm_s390_tod_realize(DeviceState *dev, Error **errp)
+{
+ S390TODState *td = S390_TOD(dev);
+ S390TODClass *tdc = S390_TOD_GET_CLASS(td);
+ Error *local_err = NULL;
+
+ tdc->parent_realize(dev, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ /*
+ * We need to know when the VM gets started/stopped to start/stop the TOD.
+ * As we can never have more than one TOD instance (and that will never be
+ * removed), registering here and never unregistering is good enough.
+ */
+ qemu_add_vm_change_state_handler(kvm_s390_tod_vm_state_change, td);
+}
+
static void kvm_s390_tod_class_init(ObjectClass *oc, void *data)
{
S390TODClass *tdc = S390_TOD_CLASS(oc);
+ device_class_set_parent_realize(DEVICE_CLASS(oc), kvm_s390_tod_realize,
+ &tdc->parent_realize);
tdc->get = kvm_s390_tod_get;
tdc->set = kvm_s390_tod_set;
}
+static void kvm_s390_tod_init(Object *obj)
+{
+ S390TODState *td = S390_TOD(obj);
+
+ /*
+ * The TOD is initially running (value stored in KVM). Avoid needless
+ * loading/storing of the TOD when starting a simple VM, so let it
+ * run although the (never started) VM is stopped. For migration, we
+ * will properly set the TOD later.
+ */
+ td->stopped = false;
+}
+
static TypeInfo kvm_s390_tod_info = {
.name = TYPE_KVM_S390_TOD,
.parent = TYPE_S390_TOD,
.instance_size = sizeof(S390TODState),
+ .instance_init = kvm_s390_tod_init,
.class_init = kvm_s390_tod_class_init,
.class_size = sizeof(S390TODClass),
};