Hi guys, I am working on the time drift issue as background info here.
http://mid.gmane.org/87pq5r5otp....@codemonkey.ws As Anthony proposed, one part of the solutions is that we want to add a qemu-ga command to resync the guest clock by reading the wallclock time when the tick overflow the limit to the number of missed ticks. When I implement on the qemu-ga side, I got some problems and I'd like to send this RFC out and ask for suggestions and comments to make sure I am in the right direction before I send out the code. The proposed interface for qemu-ga command as link here: http://wiki.qemu.org/Features/GuestAgent/UsefulCommands This maybe easier to implement, but I think this interface may have problem, like the delta issue. So I am trying to implement it like below. The interface looks like: { 'command': 'guest-resync-time' } The way it works: When calling this command in the host, qemu-ga would try to get the wallclock time in the host by handling guest->host commands, and then write this time to the guest hardware. But looks like we don't have the way to get host information now, since qemu-ga just handle host->guest commands (Correct me if I am wrong). To solve this, we should add support to get host information by handling guest->host commands by qemu-ga first. Please correct me if I am wrong. And suggestions and comments are very appreciated, specifically the way to handle quest->host commands by qemu-ga since I am still struggling with this. Thanks! -- Lei
