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Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes b

From: Marcin Gibuła
Subject: Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes backward
Date: Mon, 05 May 2014 19:46:41 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

W dniu 2014-05-05 15:51, Alexander Graf pisze:
When we migrate we ask the kernel about its current belief on what the guest
time would be. However, I've seen cases where the kvmclock guest structure
indicates a time more recent than the kvm returned time.


is it possible to have kvmclock jumping forward?

Because I've reproducible case when at about 1 per 20 vm restores, VM freezes for couple of hours and then resumes with date few hundreds years ahead. Happens only with kvmclock.

And this patch seems to fix very similar issue so maybe it's all the same bug.


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