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

[Alexander Graf]

On 01.10.2012, at 15:19, Anthony Liguori wrote:

> Jan Kiszka <address@hidden> 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

Should be easy to have around as backwards compat hack. All it needs to do is 
set accel=tcg.

> -no-kvm-irqchip
> -no-kvm-pit
> -no-kvm-pit-reinjection

Those are quite important, as we need cmdline backwards compatibility.

> -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.
> 
> -drive ...,boot= <- this is ignored

It's ignored, but useful for certain things. I don't know how many of our users 
use boot= today, but it's certainly still in the code, and supported. I 
honestly wouldn't mind to carry a SUSE specific patch that implements boot= for 
now until we can deem it deprecated enough that we can drop it.

> cpu_set command for CPU hotplug which is known broken in qemu-kvm.
> 
> testdev which is nice but only used for development
> 
> Default nic is rtl8139 vs. e1000.

Couldn't we have a machine option that tells us that -M pc-1.2 is really -M 
pc-kvm-1.2? That way we could implement the device difference, right?


Alex

> 
> Some logic to move change the default VGA ram size to 16mb for pc-1.2
> (QEMU uses 16mb by default now too).
> 
> 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.  Is there anything else that needs to happen to make that
> switch?
> 
> Regards,
> 
> Anthony Liguori
> 
>> 
>> But I would really stop worrying about the qemu-kvm code base.
>> 
>> Jan
>> 
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>