Re: [Xen-devel] [Qemu-devel] [PATCH 19/18] Introduce "xen-load-devices-state"

[Wen Congyang <wency@xxxxxxxxxxxxxx>]

On 10/24/2014 10:04 PM, Eric Blake wrote:
> On 10/24/2014 01:06 AM, Wen Congyang wrote:
>> Introduce a "xen-load-devices-state" QAPI command that can be used to load
>> the state of all devices, but not the RAM or the block devices of the
>> VM.
>>
>> We only have hmp commands savevm/loadvm, and qmp commands
>> xen-save-devices-state.
>>
>> We use this new command for COLO:
>> 1. suspend both primay vm and secondary vm
>> 2. sync the state
>> 3. resume both primary vm and secondary vm
>>
>> In such case, we need to update all devices's state in any time.
>>
>> Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
>> Cc: qemu-devl <qemu-devel@xxxxxxxxxx>
>> Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
>> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
>> ---
>>  qapi-schema.json | 18 ++++++++++++++++++
>>  qmp-commands.hx  | 27 +++++++++++++++++++++++++++
>>  savevm.c         | 36 ++++++++++++++++++++++++++++++++++++
>>  3 files changed, 81 insertions(+)
>>
> 
>> +#
>> +# Since: 2.0
>> +##
>> +{ 'command': 'xen-load-devices-state', 'data': {'filename': 'str'} }
> 
> s/2.0/2.2/ - if you even get it in 2.2 (haven't we already passed soft
> freeze, but this is a feature addition?)
> 

I forgot to update it. I will update it in the next version. But this qmp
command is for COLO, so I don't post the next version until xen-4.5 is
released.

Thanks
Wen Congyang

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