Changes in v2: Add UIP check logic. Add logic that next second tick will occur in exactly 500ms later after setting the clock Current RTC emulation uses periodic timer(2 timers per second) to update RTC clock. And it will stop CPU staying at deep C-state for long period. Our experience shows the Pkg C6 residency reduced 6% when running 64 idle guest. The following patch stop the two periodic timer and only updating RTC clock when guest try to read it. --- Yang Zhang (4): RTC: Update the RTC clock only when reading it RTC: Add RTC update-ended interrupt support RTC: Add alarm support RTC: Add UIP(update in progress) check logic hw/mc146818rtc.c | 447 +++++++++++++++++++++++++++++++++++++----------------- 1 files changed, 308 insertions(+), 139 deletions(-) best regards yang -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
