Re: [Qemu-devel] qemu-kvm: remove "boot=on|off" drive parameter compatibility

[Jan Kiszka <jan.kiszka@siemens.com>]

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
> 
> 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

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