Re: [Qemu-devel] [PATCH 2/5] exec: qemu_ram_alloc_device, qemu_ram_resize

[Paolo Bonzini]

On 19/11/2014 14:57, Juan Quintela wrote:
> > Shipping a separate BIOS for different machine types is unrealistic and
> > pointless.  It would also be a good terrain for bug reports, unless you
> > also do things like "forbid creating -device megasas-gen2 on 2.1 because
> > it was introduced in 2.2".
>
> And I agree with that.  If it got introduced on 2.2, it should not be
> allowed on pc-2.1.  It just makes things more complicated.  We don't
> have infrastructure to enforce that.  And I am claining that is the
> problem.  We are just papering over this problem each time that it
> happens.  I honestely think that the only way to really fix
> compatibility is enforcing that machine types are stable.  right now
> they are now, and we ended nothing it.

Weird, I have bought this USB device last month and I plugged it into a
two-year-old laptop.

    QEMU version = when did I last update firmware / buy hardware
    Machine type = when did I buy the computer

I honestly think that you are talking out of design dogma, without
really thinking through the consequences of the design.

Paolo