Subject: [PATCH v12 0/6] arm/KVM: dirty page logging support for ARMv7 (3.17.0-rc1)

From: [email-masked] (Wanpeng Li)
Date: Tue, 28 Oct 2014 09:24:31 +0800

On Mon, Oct 27, 2014 at 05:28:28PM -0700, Mario Smarduch wrote:
>Hi Wanpeng,
>
>On 10/27/2014 04:26 PM, Wanpeng Li wrote:
>[...]
>>>
>>> Testing:
>>> - Generally live migration + checksumming of source/destination memory regions 
>>>  is used validate correctness. 
>> 
>> Could you tell me where to get the checksum you are using? In addition,
>> checksum should be used at which point of live migration?
>> 
>> Regards,
>> Wanpeng Li 
>qemu in https://github.com/mjsmar/arm-dirtylog-tests/tree/master/v7/test
>is instrumented to save the guest ram on source and destination.
>
>On source it dumps ram to file (ramimage0) from ram VMHandler
>save_live_complete, right after source has stopped iterating and
>remaining memory (and other VM state) to transfer is within
>downtime threshold (about 70-90mS).
>
>On destination guest ram is dumped to file qemu_loadvm_state() just
>before the guest is started.

Do you mean the file on destination include the guest ram which right after 
source has stopped iterating and remaining memory(and other VM state), however,
the file on source just include the guest ram which right after source has 
stopped iterating? 

In addition, how to get the checksum which you are using?

Regards,
Wanpeng Li 

>
>It works for 'machvirt' and 'VExpress' machine models, the start
>addresses are hardcoded while walking ram_list searching for a matching
>RAMBlock.
>
>Unless you have armv7 hardware I'm not sure how you can reproduce
>it, it may be possible on Fast Models but I have not tried it, most
>likely it would be extremely slow.
>
>- Mario
>
>
>> 
>>> - qemu machvirt, VExpress - Exynos 5440, FastModels - lmbench + dirty guest
>>>  memory cycling.
>>> - ARMv8 Foundation Model/kvmtool - Due to slight overlap in 2nd stage handlers
>>>  did a basic bringup using qemu.
>>> - x86_64 qemu  default machine model, tested migration on HP Z620, tested 
>>>  convergence for several dirty page rates
>>>
>>> See https://github.com/mjsmar/arm-dirtylog-tests
>>>    - Dirtlogtest-setup.pdf for ARMv7
>>>    - https://github.com/mjsmar/arm-dirtylog-tests/tree/master/v7 - README
>>>
>[...]
>>>
>>> -- 
>>> 1.7.9.5
>>>
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