Re: [Qemu-devel] [patch 1/3] kvmclock: Ensure time in migration never goes backward

[Alexander Graf]

Who are you pinging?


Alex

On 09.09.14 17:12, Marcelo Tosatti wrote:
> Ping?
> 
> On Fri, Sep 05, 2014 at 10:52:45AM -0300, Marcelo Tosatti wrote:
>> From: Alexander Graf <address@hidden>
>>
>> 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.
>>
>> To make sure we never go backwards, calculate what the guest would have seen 
>> as time at the point of migration and use that value instead of the kernel 
>> returned one when it's more recent.  
>> This bases the view of the kvmclock after migration on the 
>> same foundation in host as well as guest.
>>
>> Signed-off-by: Alexander Graf <address@hidden>
>> Cc: address@hidden
>> Reviewed-by: Marcelo Tosatti <address@hidden>
>> Signed-off-by: Paolo Bonzini <address@hidden>
> 
>