Re: [PATCH v1 1/1] util/async-teardown: wire up query-command-line-options

[Claudio Imbrenda <imbrenda@linux.ibm.com>]

On Mon, 20 Mar 2023 09:56:05 +0100
Thomas Huth <thuth@redhat.com> wrote:

> On 20/03/2023 08.48, Claudio Imbrenda wrote:
> > The recently introduced -async-teardown commandline option was not
> > wired up properly and did not show up in the output of the QMP command
> > query-command-line-options. This means that libvirt will have no way to
> > discover whether the feature is supported.
> > 
> > This patch fixes the issue by correctly wiring up the commandline
> > option so that it appears in the output of query-command-line-options.
> > 
> > Reported-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
> > Fixes: c891c24b1a ("os-posix: asynchronous teardown for shutdown on Linux")
> > Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
> > ---
> >   util/async-teardown.c | 18 ++++++++++++++++++
> >   1 file changed, 18 insertions(+)
> > 
> > diff --git a/util/async-teardown.c b/util/async-teardown.c
> > index 62cdeb0f20..9a2e7bc146 100644
> > --- a/util/async-teardown.c
> > +++ b/util/async-teardown.c
> > @@ -12,6 +12,9 @@
> >    */
> >   
> >   #include "qemu/osdep.h"
> > +#include "qemu/config-file.h"
> > +#include "qemu/option.h"
> > +#include "qemu/module.h"
> >   #include <dirent.h>
> >   #include <sys/prctl.h>
> >   #include <sched.h>
> > @@ -144,3 +147,18 @@ void init_async_teardown(void)
> >       clone(async_teardown_fn, new_stack_for_clone(), CLONE_VM, NULL);
> >       sigprocmask(SIG_SETMASK, &old_signals, NULL);
> >   }
> > +
> > +static QemuOptsList qemu_async_teardown_opts = {
> > +    .name = "async-teardown",
> > +    .implied_opt_name = "enable",  
> 
> Are you sure about the "implied_opt_name" field? If I got that right, it's 

yeah that should not be there, I'll fix and send a v2

> used for options where you can omit the part before the "=" in the first 
> paramter, e.g.
> 
>   -netdev user
> 
> is the same as:
> 
>   -netdev type=user
> 
> ... but as far as I can see, there is no way to use
> 
>   -async-teardown enable=off
> 
> at the command line?
> 
>   Thomas
> 
> 
> > +    .head = QTAILQ_HEAD_INITIALIZER(qemu_async_teardown_opts.head),
> > +    .desc = {
> > +        { /* end of list */ }
> > +    },
> > +};
> > +
> > +static void register_async_teardown(void)
> > +{
> > +    qemu_add_opts(&qemu_async_teardown_opts);
> > +}
> > +opts_init(register_async_teardown);  
>