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Date: Wed, 3 Oct 2012 11:55:32 +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@siemens.com>
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 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.

> > Default nic is rtl8139 vs. e1000.
> > 
> > Some logic to move change the default VGA ram size to 16mb for pc-1.2
> > (QEMU uses 16mb by default now too).
> 
> Also nicely manageable in a wrapper.
> 
> > 
> > I think at this point, none of this matters but I added the various
> > distro maintainers to the thread.
> > 
> > I think it's time for the distros to drop qemu-kvm and just ship
> > qemu.git.
> 
> +1
> 
> Jan
> 
> >  Is there anything else that needs to happen to make that
> > switch?
> > 
> > Regards,
> > 
> > Anthony Liguori
> 
> -- 
> Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
> Corporate Competence Center Embedded Linux

--
			Gleb.