Re: [Qemu-devel] [QEMU PATCH v2] kvmclock: advance clock by time window between vm_stop and pre_save

[Juan Quintela]

Marcelo Tosatti <address@hidden> wrote:
> This patch, relative to pre-copy migration codepath,
> measures the time between vm_stop() and pre_save(),
> which includes copying the remaining RAM to destination,
> and advances the clock by that amount.
>
> In a VM with 5 seconds downtime, this reduces the guest
> clock difference on destination from 5s to 0.2s.
>
> Tested with Linux and Windows 2012 R2 guests with -cpu XXX,+hv-time.
>
> Signed-off-by: Marcelo Tosatti <address@hidden>
>
> ---
>
> v2: use subsection (Juan Quintela)
>     fix older machine types support
>

Reviewed-by: Juan Quintela <address@hidden>