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
