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Re: [Qemu-devel] [PATCH v3 2/2] target-i386: add migration support for I

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v3 2/2] target-i386: add migration support for Intel LMCE
Date: Thu, 9 Jun 2016 10:23:52 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0

On 09/06/2016 09:16, Haozhong Zhang wrote:
> On 06/08/16 13:36, Paolo Bonzini wrote:
>> On 03/06/2016 08:09, Haozhong Zhang wrote:
>>> LMCE is disabled by default, but a cpu option 'lmce=on/off' is provided
>>> to enable/disable it. Migration is only allowed between VCPUs with the
>>> same lmce option.
>> This is not needed at all if you do the change in patch 1 that Eduardo
>> requested (refuse to start if the host doesn't have the required
>> capabilities).
>> So if you do that you can just move the lmce property to patch 1.
> But it doesn't cover the migration from lmce-enabled qemu to
> lmce-disabled qemu where KVM on both hosts support LMCE.

That's a configuration problem; configuration is not migrated and is
assumed to be the same on the source and the destination.  You don't
need to test for this scenario.


 In that case,
> both qemu can start without failure, but the guest OS will run in a VM
> with different configurations after migration. To avoid this, I didn't
> leave the lmce property in patch 1, so that users have no way to
> enable LMCE without this patch 2.

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