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From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] ahci drive: how to make it non-bootable?
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To: Michael Tokarev <mjt@tls.msk.ru>
Cc: qemu-devel <qemu-devel@nongnu.org>

  Hi,

>> bootindex=1 for virtio
> 
> -drive file=winguest.raw,if=virtio,bootindex=1 --
> 
> this does not work:

Oops.  I through it does, but seems this is only the case for the old &
deprecated boot=on (and maybe even that only in qemu-kvm).

>  qemu: -drive file=winguest.raw,if=virtio,bootindex=1: Invalid parameter 'bootindex'
> 
> I understand that I probably can replace this single
> -drive with 3 parameters -- -device virtio-blk-pci,
> -drive if=none, and -device ide-drive.

It's two only:
  -drive if=none,id=<name>,...
  -device virtio-blk-pci,drive=<name>

> Also, still, the question in the $subj: how to make the ahci
> drive non-bootable?

I think you can't.

seabios uses a few numbers just above 100 for the internal default
ordering (hd first, then cdrom, then nic, then others) in case no
bootindex is specified.  So you can try bootindex=200, that should get
ahci to the bottom of the boot menu, maybe that is good enougth.

cheers,
  Gerd