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icount: Add align option to icount

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The align option is used for activating the align algorithm
in order to synchronise the host clock and the guest clock.

Signed-off-by: Sebastian Tanase <sebastian.tanase@openwide.fr>
Tested-by: Camille Bégué <camille.begue@openwide.fr>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sebastian Tanase 2014-07-25 11:56:29 +02:00 • committed by Paolo Bonzini
parent 1ad9580bd7
commit a8bfac3708
4 changed files with 30 additions and 9 deletions
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19
cpus.c
View file

@ -476,25 +476,30 @@ static const VMStateDescription vmstate_timers = {
void configure_icount(QemuOpts *opts, Error **errp)
{
const char *option;
char *rem_str = NULL;
seqlock_init(&timers_state.vm_clock_seqlock, NULL);
vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
option = qemu_opt_get(opts, "shift");
if (!option) {
if (qemu_opt_get(opts, "align") != NULL) {
error_setg(errp, "Please specify shift option when using align");
}
return;
}
/* When using -icount shift, the shift option will be
misinterpreted as a boolean */
if (strcmp(option, "on") == 0 || strcmp(option, "off") == 0) {
error_setg(errp, "The shift option must be a number or auto");
}
icount_align_option = qemu_opt_get_bool(opts, "align", false);
icount_warp_timer = timer_new_ns(QEMU_CLOCK_REALTIME,
icount_warp_rt, NULL);
if (strcmp(option, "auto") != 0) {
icount_time_shift = strtol(option, NULL, 0);
errno = 0;
icount_time_shift = strtol(option, &rem_str, 0);
if (errno != 0 || *rem_str != '\0' || !strlen(option)) {
error_setg(errp, "icount: Invalid shift value");
}
use_icount = 1;
return;
} else if (icount_align_option) {
error_setg(errp, "shift=auto and align=on are incompatible");
}
use_icount = 2;