Re: Live Migration of 32-bit Linux guest broken since 2.6.35-rc2

Avi Kivity
2010-06-08T13:34:41Z

On 06/08/2010 04:28 PM, Peter Lieven wrote:
>>
>>> i will retry the case later today and send info register output.
>>> what is the recommended value for nx (and why)?
>>
>> Enabled (so you get no-execute memory protection).
>
> do you have a guideline which flags should be identical to ensure
> proper live migration?
> i would like to do an automatic compare before life migration to avoid
> crashes.

All of them [1]. If you have an asymmetric machine, you can disable
those flags with the -cpu switch.

Note the default qemu cpu disables many flags, so if one machine has
sse4.2 and the other doesn't, migration will still work without
disabling anything.

[1] Rather, all flags understood by qemu and kvm that are enabled by the
cpu model that you gave to qemu with -cpu.

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