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Re: [Qemu-devel] [RFC] exec: eliminate ram naming issue as migration


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RFC] exec: eliminate ram naming issue as migration
Date: Mon, 5 Feb 2018 17:53:43 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2

On 05/02/2018 17:44, Tan, Jianfeng wrote:
>>>
>> I understand.  However it's not as bad as "there's no possibility at all
>> to migrate from vhost-kernel to vhost-user".  There are cases that are
>> more problematic: for example, there's no possibility at all to add
>> memory NUMA policy during a live migration, unless -object
>> memory-backend-* was used on the source.
> 
> Please help me to understand: Are you saying it's always recommended to
> use -object memory-backend-* configuration even with vhost-kernel
> backend for the reason you mentioned?

Indeed---in general, there's no downside to always using -object to
start a virtual machine.  Of course when migrating a machine that was
started without -object, you need to use it on the destination too.

Paolo



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