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

[Kevin Wolf]

Am 09.07.2012 12:02, schrieb Gleb Natapov:
> On Mon, Jul 09, 2012 at 11:52:32AM +0200, Kevin Wolf wrote:
>>> 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.
>>
> Would break it how?

A guest that has an IDE driver, but not an AHCI one can be started with
'qemu -hda foo.img' today. After changing the default to a q35 machine
type which uses AHCI by default, this guest wouldn't boot any more with
the same command line.

Kevin