Re: Limiting instructions for guest to help with migration to different host

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On 01/04/2018 02:54 AM, R wrote:
> Hello,
> 
> I am migrating a suspended x86-64 guest (disk & state) across
> different x86-64 hosts with small differences in the available CPU
> instructions and when I try to resume the guest on the different host
> libvirt reports an error like this "CPU feature XXX not found" and
> fails. My question is, is there a way to limit the instructions that
> are used on the "origin" host when creating the guest to avoid this
> error? I am pretty sure there is a set of basic instructions that are
> available across all hosts which could be used for this purpose.
> 
> Thank you!
> 


You want to take a look at specifying the guest CPU:

https://libvirt.org/formatdomain.html#elementsCPU

Michal

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