Re: [Qemu-devel] [PATCH v2 07/12] vl: Create block backends before setting machine properties

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 3/7/19 6:23 PM, Markus Armbruster wrote:
> qemu-system-FOO's main() acts on command line arguments in its own
> idiosyncratic order.  There's not much method to its madness.
> Whenever we find a case where one kind of command line argument needs
> to refer to something created for another kind later, we rejigger the
> order.
> 
> Block devices get created long after machine properties get processed.
> Therefore, block device machine properties can be created, but not
> set.  No such properties exist.  But the next commit will create some.
> Time to rejigger again: create block devices earlier.
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>  vl.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/vl.c b/vl.c
> index 5a19d2a8ec..c250483fc1 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -4272,6 +4272,13 @@ int main(int argc, char **argv, char **envp)
>          exit(0);
>      }
>  
> +    /*
> +     * Note: we need to create block backends before
> +     * machine_set_property(), so machine properties can refer to
> +     * them.
> +     */

Thanks!

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

> +    configure_blockdev(&bdo_queue, machine_class, snapshot);
> +
>      machine_opts = qemu_get_machine_opts();
>      qemu_opt_foreach(machine_opts, machine_set_property, current_machine,
>                       &error_fatal);
> @@ -4398,8 +4405,6 @@ int main(int argc, char **argv, char **envp)
>      ram_mig_init();
>      dirty_bitmap_mig_init();
>  
> -    configure_blockdev(&bdo_queue, machine_class, snapshot);
> -
>      qemu_opts_foreach(qemu_find_opts("mon"),
>                        mon_init_func, NULL, &error_fatal);
>  
>