From 3ef0eab178e5120a0e1c079d163d5c71689d9b71 Mon Sep 17 00:00:00 2001 From: Pavel Dovgalyuk Date: Fri, 7 Nov 2014 13:31:33 +0300 Subject: [PATCH] acpi: accurate overflow check Compare clock in ns, because acpi_pm_tmr_update uses rounded to ns value instead of ticks. Signed-off-by: Pavel Dovgalyuk [This lets Windows boot in icount mode. - Paolo] Signed-off-by: Paolo Bonzini --- hw/acpi/core.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/hw/acpi/core.c b/hw/acpi/core.c index a7368fb242..51913d6932 100644 --- a/hw/acpi/core.c +++ b/hw/acpi/core.c @@ -376,8 +376,11 @@ static void acpi_notify_wakeup(Notifier *notifier, void *data) /* ACPI PM1a EVT */ uint16_t acpi_pm1_evt_get_sts(ACPIREGS *ar) { - int64_t d = acpi_pm_tmr_get_clock(); - if (d >= ar->tmr.overflow_time) { + /* Compare ns-clock, not PM timer ticks, because + acpi_pm_tmr_update function uses ns for setting the timer. */ + int64_t d = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + if (d >= muldiv64(ar->tmr.overflow_time, + get_ticks_per_sec(), PM_TIMER_FREQUENCY)) { ar->pm1.evt.sts |= ACPI_BITMASK_TIMER_STATUS; } return ar->pm1.evt.sts;