Improve default machine type selection

[Ján Tomko]

On a Monday in 2023, Jim Fehlig wrote:
>If an explicit machine type is not specified in the VM config, the 
>qemu driver will select the first machine type in the list of machine 
>types for the specified accelerator. See 
>virQEMUCapsGetPreferredMachine
>
>https://gitlab.com/libvirt/libvirt/-/blob/master/src/qemu/qemu_capabilities.c#L6133
>
>On my test machines, this works reasonably well for x86_64 where the 
>first machine type is pc-i440fx-7.1. But for aarch64, the first 
>machine is integratorcp, which is not very useful with maxCpus=1 and 
>other limitations. 

Is it possible to run such machine with libvirt?

If not, we could say our default is faulty and pick a new one.

Jano

>Would it be possible to select a "better" default 
>machine type? E.g. 'pc' for x86_64, 'virt' for aarch64, etc. I'm happy 
>to work on this if folks deem it's a reasonable improvement. It would 
>benefit tools like the libvirt terraform provider, which prefer to use 
>something more generic like <type>hvm</type>.
>
>Regards,
>Jim
>
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