Windows 2008+ is very sensitive to missed ticks. The RTC is used by default as the time source. If time drift is not enabled, Windows is prone to blue screening.
Signed-off-by: Crístian Viana <via...@linux.vnet.ibm.com> --- hw/mc146818rtc.c | 2 +- vl.c | 10 +++++----- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c index 2b59c36..2b31587 100644 --- a/hw/mc146818rtc.c +++ b/hw/mc146818rtc.c @@ -726,7 +726,7 @@ ISADevice *rtc_init(ISABus *bus, int base_year, qemu_irq intercept_irq) static Property mc146818rtc_properties[] = { DEFINE_PROP_INT32("base_year", RTCState, base_year, 1980), DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", RTCState, - lost_tick_policy, LOST_TICK_DISCARD), + lost_tick_policy, LOST_TICK_SLEW), DEFINE_PROP_END_OF_LIST(), }; diff --git a/vl.c b/vl.c index 112b0e0..11817e5 100644 --- a/vl.c +++ b/vl.c @@ -539,18 +539,18 @@ static void configure_rtc(QemuOpts *opts) value = qemu_opt_get(opts, "driftfix"); if (value) { if (!strcmp(value, "slew")) { - static GlobalProperty slew_lost_ticks[] = { + /* slew is default */ + } else if (!strcmp(value, "none")) { + static GlobalProperty discard_lost_ticks[] = { { .driver = "mc146818rtc", .property = "lost_tick_policy", - .value = "slew", + .value = "discard", }, { /* end of list */ } }; - qdev_prop_register_global_list(slew_lost_ticks); - } else if (!strcmp(value, "none")) { - /* discard is default */ + qdev_prop_register_global_list(discard_lost_ticks); } else { fprintf(stderr, "qemu: invalid option value '%s'\n", value); exit(1); -- 1.7.8.5