Re: [Qemu-devel] [PATCH 1/2] hw: cannot_instantiate_with_device_add_yet due to pointer props

[Peter Maydell <peter.maydell@linaro.org>]

On 7 January 2014 12:33, Andreas Färber <afaerber@suse.de> wrote:
> Am 16.12.2013 10:33, schrieb Peter Maydell:
>> Anyway, I don't actively object to this series. I just think
>> Anthony's going in the wrong direction which is why I haven't
>> been particularly eager to actively mark it as reviewed-by me
>> either...
>
> Sorry for not taking the time to reply to these concerns earlier. I
> thought it was self-speaking that the enterprise Linux distributors
> among us want a safeguard to avoid customers from crashing a
> long-running VM with some avoidable device_add.

Sure. I think the right way to do that is to only allow
them to plug in devices that are truly pluggable (ie which
are on some pluggable bus like PCI or USB), rather than
this way round, which is trying to blacklist devices rather
than whitelist bus types.

In short, we shouldn't be trying to cram all of "hotplug",
"I want an extra PCI card in my VM" and "I want to do
complete from-scratch construction of a machine model
including wiring up all the interrupts and defining the
memory map" into the same interface, because the flexibility
you need for the last one of these is going to cause endless
user errors when attempting the first two.

thanks
-- PMM