Re: If your networking is failing after updating to the latest git version of QEMU...

[Alex Bennée]

Thomas Huth <thuth@redhat.com> writes:

> On 29/09/2022 04.32, Jason Wang wrote:
>> On Thu, Sep 29, 2022 at 1:06 AM Philippe Mathieu-Daudé <f4bug@amsat.org> 
>> wrote:
>>>
>>> On 28/9/22 10:27, Thomas Huth wrote:
>>>>
>>>> ... it might have happened due to the removal of the "slirp" submodule
>>>> from the git repository. For example if you see an error message like this:
>>>>
>>>>    Parameter 'type' expects a netdev backend type
>>>>
>>>> this likely means that the "user" mode backend type is not available in
>>>> your binary anymore. To fix it, simply install "libslirp-devel" (or
>>>> libslirp-dev or however it is called) from your OS distribution and
>>>> recompile.
>>>
>>> Thanks for the hint Thomas. I'm afraid many developers will miss your
>>> email.
>>>
>>> Jason, Marc-André, could we improve the buildsys check or display
>>> a more helpful information from the code instead?
>> It looks to me we need to improve the build.
>
> I'm not sure there is anything to improve in the build system -
> configure/meson.build are just doing what they should: Pick the
> default value for "slirp" if the user did not explicitly specify
> "--enable-slirp".

Shouldn't it be the other way round and fail to configure unless the
user explicitly calls --disable-slirp?

>
> But the error message is not very helpful. It should rather say
> something like (partly suggested by Daniel in IRC yesterday already):
>
>  Type 'user' is not a supported netdev backend by this QEMU build.
>  Please check the spelling or whether it has been enabled at
> compilation time.
>
> ... or something like this.
>
> Someone interested to write a patch?
>
>  Thomas


-- 
Alex Bennée