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Re: [BUG] Migration hv_time rollback

From: Paolo Bonzini
Subject: Re: [BUG] Migration hv_time rollback
Date: Wed, 16 Sep 2020 15:05:40 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0

On 16/09/20 13:29, Dr. David Alan Gilbert wrote:
>> I have tracked the bug to the fact that `kvmclock` is not exposed and
>> disabled from qemu PoV but is in fact used by `hv-time` (in KVM).
>> I think we should enable the `kvmclock` (qemu device) if `hv-time` is
>> present and add Hyper-V support for the `kvmclock_current_nsec`
>> function.

Yes, this seems correct.  I would have to check but it may even be
better to _always_ send kvmclock data in the live migration stream.


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