Re: [PATCH 2/6] tests/qtest: Add qtest_probe_accel() method

[Thomas Huth <thuth@redhat.com>]

On 12/03/2021 00.11, Philippe Mathieu-Daudé wrote:
> Introduce the qtest_probe_accel() method which allows
> to query at runtime if a QEMU instance has an accelerator
> built-in.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>   tests/qtest/libqos/libqtest.h |  9 +++++++++
>   tests/qtest/libqtest.c        | 24 ++++++++++++++++++++++++
>   2 files changed, 33 insertions(+)
> 
> diff --git a/tests/qtest/libqos/libqtest.h b/tests/qtest/libqos/libqtest.h
> index a68dcd79d44..ebedb82ec98 100644
> --- a/tests/qtest/libqos/libqtest.h
> +++ b/tests/qtest/libqos/libqtest.h
> @@ -763,6 +763,15 @@ void qmp_expect_error_and_unref(QDict *rsp, const char *class);
>    */
>   bool qtest_probe_child(QTestState *s);
>   
> +/**
> + * qtest_probe_accel:
> + * @s: QTestState instance to operate on.
> + * @name: Accelerator name to check for.
> + *
> + * Returns: true if the accelerator is built in.
> + */
> +bool qtest_probe_accel(QTestState *s, const char *name);

Maybe better qtest_has_accel() ? ... that makes it clear right from the 
start what the return type is about.

>   /**
>    * qtest_set_expected_status:
>    * @s: QTestState instance to operate on.
> diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
> index 71e359efcd3..57e7e55b9cc 100644
> --- a/tests/qtest/libqtest.c
> +++ b/tests/qtest/libqtest.c
> @@ -872,6 +872,30 @@ void qtest_qmp_eventwait(QTestState *s, const char *event)
>       qobject_unref(response);
>   }
>   
> +bool qtest_probe_accel(QTestState *s, const char *name)
> +{
> +    bool has_accel = false;
> +    QDict *response;
> +    QList *accels;
> +    QListEntry *accel;
> +
> +    response = qtest_qmp(s, "{'execute': 'query-accels'}");
> +    accels = qdict_get_qlist(response, "return");
> +
> +    QLIST_FOREACH_ENTRY(accels, accel) {
> +        QDict *accel_dict = qobject_to(QDict, qlist_entry_obj(accel));
> +        const char *accel_name = qdict_get_str(accel_dict, "name");
> +
> +        if (!strcmp(name, accel_name)) {

I'd prefer g_str_equal() ... that's easier to read.

> +            has_accel = true;
> +            break;
> +        }
> +    }
> +    qobject_unref(response);
> +
> +    return has_accel;
> +}
> +
>   char *qtest_vhmp(QTestState *s, const char *fmt, va_list ap)
>   {
>       char *cmd;
> 

  Thomas