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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: Tue, 06 May 2014 21:54:35 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

Yes, and it isn't. Any ideas why it's not? This patch really just uses
the guest visible kvmclock time rather than the host view of it on

There is definitely something very broken on the host's side since it
does return a smaller time than the guest exposed interface indicates.

Don't know if helps but here are example values from time_at_migration and s->clock from your patch.

Tested on 5 restores of saved VM that (used to) hang:

   s->clock      time_at_migration
157082235125698  157113284546655
157082235125698  157113298196976
157082235125698  157113284615117
157082235125698  157113284486601
157082235125698  157113284479740

Now, when I compare system time on guest with and without patch:

On unpatched qemu vm restores with date: Apr 18 06:56:36
On patched qemu it says: Apr 18 06:57:06


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