This can be used to force-synchronize the time in guest after a long stop-cont pause, which can be useful for serverless-type workload.
Signed-off-by: Daniil Tatianin <d-tatia...@yandex-team.ru> --- hw/rtc/mc146818rtc.c | 15 +++++++++++++++ include/hw/rtc/mc146818rtc.h | 1 + qapi/misc-target.json | 16 ++++++++++++++++ 3 files changed, 32 insertions(+) diff --git a/hw/rtc/mc146818rtc.c b/hw/rtc/mc146818rtc.c index f4c1869232..6980a78d5f 100644 --- a/hw/rtc/mc146818rtc.c +++ b/hw/rtc/mc146818rtc.c @@ -116,6 +116,21 @@ void qmp_rtc_reset_reinjection(Error **errp) } } +void qmp_rtc_notify(Error **errp) +{ + MC146818RtcState *s; + + /* + * See: + * https://www.kernel.org/doc/Documentation/virtual/kvm/timekeeping.txt + */ + QLIST_FOREACH(s, &rtc_devices, link) { + s->cmos_data[RTC_REG_B] |= REG_B_UIE; + s->cmos_data[RTC_REG_C] |= REG_C_IRQF | REG_C_UF; + qemu_irq_raise(s->irq); + } +} + static bool rtc_policy_slew_deliver_irq(MC146818RtcState *s) { kvm_reset_irq_delivered(); diff --git a/include/hw/rtc/mc146818rtc.h b/include/hw/rtc/mc146818rtc.h index 97cec0b3e8..5229dffbbd 100644 --- a/include/hw/rtc/mc146818rtc.h +++ b/include/hw/rtc/mc146818rtc.h @@ -56,5 +56,6 @@ MC146818RtcState *mc146818_rtc_init(ISABus *bus, int base_year, void mc146818rtc_set_cmos_data(MC146818RtcState *s, int addr, int val); int mc146818rtc_get_cmos_data(MC146818RtcState *s, int addr); void qmp_rtc_reset_reinjection(Error **errp); +void qmp_rtc_notify(Error **errp); #endif /* HW_RTC_MC146818RTC_H */ diff --git a/qapi/misc-target.json b/qapi/misc-target.json index 4e0a6492a9..20457b0acc 100644 --- a/qapi/misc-target.json +++ b/qapi/misc-target.json @@ -19,6 +19,22 @@ { 'command': 'rtc-reset-reinjection', 'if': 'TARGET_I386' } +## +# @rtc-notify: +# +# Generate an RTC interrupt. +# +# Since: 9.1 +# +# Example: +# +# -> { "execute": "rtc-notify" } +# <- { "return": {} } +# +## +{ 'command': 'rtc-notify', + 'if': 'TARGET_I386' } + ## # @SevState: # -- 2.34.1