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Date: Wed, 3 Oct 2012 12:11:04 +0200
From: Gleb Natapov <gleb@redhat.com>
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Subject: Re: [Qemu-devel] qemu-kvm: remove "boot=on|off" drive parameter
 compatibility
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To: Jan Kiszka <jan.kiszka@web.de>
Cc: kvm <kvm@vger.kernel.org>, Scott Moser <smoser@ubuntu.com>, Marcelo Tosatti <mtosatti@redhat.com>, Michael Tokarev <mjt@tls.msk.ru>, qemu-devel <qemu-devel@nongnu.org>, Anthony Liguori <anthony@codemonkey.ws>, Cole Robinson <crobinso@redhat.com>, Andreas =?utf-8?Q?F=C3=A4rber?= <afaerber@suse.de>

On Wed, Oct 03, 2012 at 12:06:57PM +0200, Jan Kiszka wrote:
> On 2012-10-03 11:55, Gleb Natapov wrote:
> > On Mon, Oct 01, 2012 at 03:26:05PM +0200, Jan Kiszka wrote:
> >> On 2012-10-01 15:19, Anthony Liguori wrote:
> >>> Jan Kiszka <jan.kiszka@siemens.com> writes:
> >>>
> >>>> On 2012-10-01 11:31, Marcelo Tosatti wrote:
> >>>>
> >>>> It's not just about default configs. We need to validate if the
> >>>> migration formats are truly compatible (qemu-kvm -> QEMU, the other way
> >>>> around definitely not). For the command line switches, we could provide
> >>>> a wrapper script that translates them into upstream format or simply
> >>>> ignores them. That should be harmless to carry upstream.
> >>>
> >>> qemu-kvm has:
> >>>
> >>>  -no-kvm
> >>>  -no-kvm-irqchip
> >>>  -no-kvm-pit
> >>>  -no-kvm-pit-reinjection
> >>>  -tdf <- does nothing
> >>>
> >>> There are replacements for all of the above.  If we need to add them to
> >>> qemu.git, it's not big deal to add them.
> >>
> >> But I don't think we should add them to the source code. This can
> >> perfectly be handled my a (disposable) script layer on top of
> >> qemu-system-x86_64 - the namespace (qemu-kvm in most cases) is also free.
> >>
> >>>
> >>>  -drive ...,boot= <- this is ignored
> >>>
> >>> cpu_set command for CPU hotplug which is known broken in qemu-kvm.
> >>
> >> Right, so nothing is lost when migrating to QEMU.
> >>
> >>>
> >>> testdev which is nice but only used for development
> >>>
> > Jan, do you have a plan for testdev device? It would be a pity to have
> > qemu-kvm just for that.
> 
> Nope, not on my schedule.
> 
Understood :)

--
			Gleb.