+static void timebase_pre_save(void *opaque)
+{
+ PPCTimebase *tb = opaque;
+ uint64_t ticks = cpu_get_real_ticks();
+ PowerPCCPU *first_ppc_cpu = POWERPC_CPU(first_cpu);
+
+ if (!first_ppc_cpu->env.tb_env) {
+ error_report("No timebase object");
+ return;
+ }
+
+ tb->time_of_the_day_ns = get_clock_realtime();
+ /*
+ * tb_offset is only expected to be changed by migration so
+ * there is no need to update it from KVM here
+ */
+ tb->guest_timebase = ticks + first_ppc_cpu->env.tb_env->tb_offset;
+}
+
+static int timebase_post_load(void *opaque, int version_id)
+{
+ PPCTimebase *tb_remote = opaque;
+ CPUState *cpu;
+ PowerPCCPU *first_ppc_cpu = POWERPC_CPU(first_cpu);
+ int64_t tb_off_adj, tb_off, ns_diff;
+ int64_t migration_duration_ns, migration_duration_tb, guest_tb, host_ns;
+ unsigned long freq;
+
+ if (!first_ppc_cpu->env.tb_env) {
+ error_report("No timebase object");
+ return -1;
+ }
+
+ freq = first_ppc_cpu->env.tb_env->tb_freq;
+ /*
+ * Calculate timebase on the destination side of migration.
+ * The destination timebase must be not less than the source timebase.
+ * We try to adjust timebase by downtime if host clocks are not
+ * too much out of sync (1 second for now).
+ */
+ host_ns = get_clock_realtime();
+ ns_diff = MAX(0, host_ns - tb_remote->time_of_the_day_ns);
+ migration_duration_ns = MIN(NSEC_PER_SEC, ns_diff);
+ migration_duration_tb = muldiv64(migration_duration_ns, freq, NSEC_PER_SEC);
+ guest_tb = tb_remote->guest_timebase + MIN(0, migration_duration_tb);
+
+ tb_off_adj = guest_tb - cpu_get_real_ticks();
+
+ tb_off = first_ppc_cpu->env.tb_env->tb_offset;
+ trace_ppc_tb_adjust(tb_off, tb_off_adj, tb_off_adj - tb_off,
+ (tb_off_adj - tb_off) / freq);
+
+ /* Set new offset to all CPUs */
+ CPU_FOREACH(cpu) {
+ PowerPCCPU *pcpu = POWERPC_CPU(cpu);
+ pcpu->env.tb_env->tb_offset = tb_off_adj;
+ }
+
+ return 0;
+}
+
+const VMStateDescription vmstate_ppc_timebase = {
+ .name = "timebase",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .pre_save = timebase_pre_save,
+ .post_load = timebase_post_load,
+ .fields = (VMStateField []) {
+ VMSTATE_UINT64(guest_timebase, PPCTimebase),
+ VMSTATE_INT64(time_of_the_day_ns, PPCTimebase),
+ VMSTATE_END_OF_LIST()
+ },
+};
+
projects / qemu.git / blobdiff