Re: [Qemu-devel] [PATCH v2] ahci: add -drive support

[Gerd Hoffmann]

  Hi,

>> If -hda has the semantics of "create an IDE device", then no, we can't 
>> change it. It doesn't however. IIRC on -M pseries -hda creates SCSI devices. 
>> On s390 -hda creates virtio devices. So if on -M q35 -hda would create 
>> if=ahci, I don't see how that breaks the CLI.
> 
> It doesn't per se, that is as long as you need to explicitly specify -M
> q35. But then changing the default machine from the existing pc to q35
> would break the command line.

That will happen _anyway_.  No doubt there will be configurations which
work with -M pc and break with -M q35.

cheers,
  Gerd