Re: [Qemu-devel] [RFC PATCH] tests/device-introspect: Test devices with all machines, not only with "none"

[Eduardo Habkost <ehabkost@redhat.com>]

On Mon, Mar 19, 2018 at 10:39:36AM +0100, Thomas Huth wrote:
> Many device introspection crashes only happen if you are using a
> certain machine, e.g.:
> 
> $ ppc-softmmu/qemu-system-ppc -S -M ref405ep,accel=qtest -qmp stdio
> {"QMP": {"version": {"qemu": {"micro": 50, "minor": 11, "major": 2},
>  "package": "build-all"}, "capabilities": []}}
> { 'execute': 'qmp_capabilities' }
> {"return": {}}
> { 'execute': 'device-list-properties',
>   'arguments': {'typename': 'macio-newworld'}}
> Unexpected error in qemu_chr_fe_init() at chardev/char-fe.c:222:
> Device 'serial0' is in use
> Aborted (core dumped)
> 
> To be able to catch these problems, let's extend the device-introspect
> test to check the devices on all machine types. Since this is a rather
> slow operation, the test is only run in "SPEED=slow" mode.
> 
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>  In case someone wants to help with creating some bug fix patches
>  during the QEMU hard freeze phase: This test can now be used to
>  trigger lots of introspection bugs that we were not aware of yet.
>  I think most of the bugs are due to wrong handling of instance_init
>  vs. realize functions.
[...]

This looks very useful, thanks!

I wonder if we could have something that would make it simpler
for us to cover more command-line combinations + QMP commands in
simple "validate output and check if QEMU won't crash" test cases
without writing extra C or Python code every time.

device-crash-test could be used for that, but I'd like to make it
simpler to extend.

-- 
Eduardo