On Mon, Oct 16, 2017 at 07:01:01PM +0200, Paolo Bonzini wrote:
> On 16/10/2017 18:59, Eduardo Habkost wrote:
> >> +DEF("paused", HAS_ARG, QEMU_OPTION_paused, \
> >> + "-paused [state=]postconf|preconf\n"
> >> + " postconf: pause QEMU after machine is initialized\n"
> >> + " preconf: pause QEMU before machine is initialized\n",
> >> + QEMU_ARCH_ALL)
> > I would like to allow pausing before machine-type is selected, so
> > management could run query-machines before choosing a
> > machine-type. Would that need a third "-pause" mode, or will we
> > be able to change "preconf" to pause before select_machine() is
> > called?
> >
> > The same probably applies to other things initialized before
> > machine_run_board_init() that could be configurable using QMP,
> > including but not limited to:
> > * Accelerator configuration
> > * Registering global properties
> > * RAM size
> > * SMP/CPU configuration
>
> Should (or could) "-M none" be changed in a backwards-compatible way to
> allow such preconfiguration? For example
>
> qemu -M none -monitor stdio
> (qemu) machine-set-options pc,accel=kvm
> (qemu) c
Sounds like an interesting idea. It would require ensuring it's
really safe to destroy current_machine/accel (and other global
state) and replace them with another object on the fly (which is
probably a nice goal by itself).
--
Eduardo
