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
