Changes in v3: Rebase to latest head. Remove the logic to update time format when DM bit changed. Allow to migrate from old version. Solve the async when reading UF and UIP Changes in v2: Add UIP check logic. Add logic that next second tick will occur in exactly 500ms later after reset divider 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 (7): RTC: Remove the logic to update time format when DM bit changed RTC: Update the RTC clock only when reading it RTC: Add UIP(update in progress) check logic RTC: Set internal millisecond register to 500ms when reset divider RTC: Add RTC update-ended interrupt support RTC: Add alarm support RTC: Allow to migrate from old version hw/mc146818rtc.c | 427 ++++++++++++++++++++++++++++++++++------------------- 1 files changed, 274 insertions(+), 153 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
