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[Qemu-devel] [PATCH 0/2 v3] Time resync support by qemu-ga
From: |
Lei Li |
Subject: |
[Qemu-devel] [PATCH 0/2 v3] Time resync support by qemu-ga |
Date: |
Fri, 1 Mar 2013 17:32:58 +0800 |
This patch series attempts to add time resync support
to qemu-ga by introducing qemu-ga commands guest-get-time
and guest-set-time.
Right now, when a guest is paused or migrated to a file
then loaded from that file, the guest OS has no idea that
there was a big gap in the time. Depending on how long the
gap was, NTP might not be able to resynchronize the guest.
So adding new guest-agent command that is called any time
a guest is resumed and which tells the guest to update its
own wall clock time based on the information from the host
will make it easier for a guest to resynchronize without
waiting for NTP.
The previous RFC send for discussion and suggestion as link
here:
http://article.gmane.org/gmane.comp.emulators.qemu/186126
The interface for these commands like:
{ 'command': 'guest-get-time', 'returns': 'int' }
{ 'command': 'guest-set-time', 'data': { 'time': int } }
Notes:
For the implementition of win32-specific commands, I plan
to send it out in another thread later.
Suggestions and comments are welcome!
Changes since v2:
- Get rid of utc-offset, and make it just pass single nanoseconds
relative to the Epoch in UTC/GMT according to Anthony and
Eric's comments.
- Make time argument mandatory.
- Fix the overflow check for year-2038 problem.
- Error handel improvment from Eric.
Changes since v1:
- Squashed patches add support to get host time and add
guest-get-time command into one.
- Documents improvment based on the suggestions from
Eric and Mike.
- Change the name of 'HostTimeInfo' to 'TimeInfo'.
- Better use-case and logic for 'guest-set-time'
command suggested by Eric.
- Error handel improvment from Luiz.
Lei Li (2):
qga: add guest-get-time command
qga: add guest-set-time command
- [Qemu-devel] [PATCH 0/2 v3] Time resync support by qemu-ga,
Lei Li <=