Re: [PATCH v3 1/2] qapi: Add exit-failure PanicAction

[Markus Armbruster <armbru@redhat.com>]

Ilya Leoshkevich <iii@linux.ibm.com> writes:

> Currently QEMU exits with code 0 on both panic an shutdown. For tests
> it is useful to return 1 on panic, so that it counts as a test
> failure.
>
> Introduce a new exit-failure PanicAction that makes main() return
> EXIT_FAILURE. Tests can use -action panic=exit-failure option to
> activate this behavior.
>
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> Reviewed-by: David Hildenbrand <david@redhat.com>

[...]

> diff --git a/qapi/run-state.json b/qapi/run-state.json
> index 6e2162d7b3..9273ea6516 100644
> --- a/qapi/run-state.json
> +++ b/qapi/run-state.json
> @@ -364,10 +364,13 @@
   ##
   # @PanicAction:

This is the type of set-action argument @panic, which is documented as
"action taken on guest panic."

   #
   # @none: Continue VM execution

I guess this is effectively "do nothing / ignore".

   #
   # @pause: Pause the VM

Clear enough.

>  #
>  # @shutdown: Shutdown the VM and exit, according to the shutdown action

I guess this is the value of set-action argument @shutdown, which is
can be

* @poweroff, documented as "Shutdown the VM and exit"

  Do we exit successfully, i.e. with zero status?

* @pause, documented as "pause the VM"

  PanicAction's documentation claims "shutdown the VM and exit", but we
  don't, we pause instead.  Not this patch's problem.

>  #
> +# @exit-failure: Shutdown the VM and exit with nonzero status

non-zero

> +#                (since 7.1)
> +#
>  # Since: 6.0
>  ##
>  { 'enum': 'PanicAction',
> -  'data': [ 'pause', 'shutdown', 'none' ] }
> +  'data': [ 'pause', 'shutdown', 'exit-failure', 'none' ] }
>  
>  ##
>  # @watchdog-set-action:

Not this patch's problem, but here goes anyway:

   ##
   # @set-action:
   #
   # Set the actions that will be taken by the emulator in response to guest
   # events.
   #
   # @reboot: @RebootAction action taken on guest reboot.
   #
   # @shutdown: @ShutdownAction action taken on guest shutdown.
   #
   # @panic: @PanicAction action taken on guest panic.
   #
   # @watchdog: @WatchdogAction action taken when watchdog timer expires .
   #
   # Returns: Nothing on success.
   #
   # Since: 6.0
   #
   # Example:
   #
   # -> { "execute": "set-action",
   #      "arguments": { "reboot": "shutdown",
   #                     "shutdown" : "pause",
   #                     "panic": "pause",
   #                     "watchdog": "inject-nmi" } }
   # <- { "return": {} }
   ##

The arguments are all optional, but the documentation neglects to spell
out what "absent" means.  I guess it means "no change".

The documentation also neglects to spell out the initial settings,
i.e. behavior when you don't configure an action with set-action.

[...]