When using an incorrect backend for the debugcon, QEMU exits silently
without any error indication, which is confusing.
Add a message that the character backend is invalid.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 vl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/vl.c b/vl.c
index 4e25c78bff..61305b5891 100644
--- a/vl.c
+++ b/vl.c
@@ -2466,6 +2466,7 @@ static int debugcon_parse(const char *devname)
     QemuOpts *opts;
 
     if (!qemu_chr_new_mux_mon("debugcon", devname)) {
+        error_report("invalid character backend '%s'", devname);
         exit(1);
     }
     opts = qemu_opts_create(qemu_find_opts("device"), "debugcon", 1, NULL);
-- 
2.17.1

On Thu, Oct 11, 2018 at 9:13 PM Philippe Mathieu-Daudé
<philmd@redhat.com> wrote:
>
> When using an incorrect backend for the debugcon, QEMU exits silently
> without any error indication, which is confusing.
> Add a message that the character backend is invalid.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>

> ---
>  vl.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/vl.c b/vl.c
> index 4e25c78bff..61305b5891 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -2466,6 +2466,7 @@ static int debugcon_parse(const char *devname)
>      QemuOpts *opts;
>
>      if (!qemu_chr_new_mux_mon("debugcon", devname)) {
> +        error_report("invalid character backend '%s'", devname);
>          exit(1);
>      }
>      opts = qemu_opts_create(qemu_find_opts("device"), "debugcon", 1, NULL);
> --
> 2.17.1
>

Cc'ing qemu-trivial@

On 11/10/2018 23:48, Marc-André Lureau wrote:
> On Thu, Oct 11, 2018 at 9:13 PM Philippe Mathieu-Daudé
> <philmd@redhat.com> wrote:
>>
>> When using an incorrect backend for the debugcon, QEMU exits silently
>> without any error indication, which is confusing.
>> Add a message that the character backend is invalid.
>>
>> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> 
> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> 
>> ---
>>  vl.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/vl.c b/vl.c
>> index 4e25c78bff..61305b5891 100644
>> --- a/vl.c
>> +++ b/vl.c
>> @@ -2466,6 +2466,7 @@ static int debugcon_parse(const char *devname)
>>      QemuOpts *opts;
>>
>>      if (!qemu_chr_new_mux_mon("debugcon", devname)) {
>> +        error_report("invalid character backend '%s'", devname);
>>          exit(1);
>>      }
>>      opts = qemu_opts_create(qemu_find_opts("device"), "debugcon", 1, NULL);
>> --
>> 2.17.1
>>

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

> When using an incorrect backend for the debugcon, QEMU exits silently
> without any error indication, which is confusing.
> Add a message that the character backend is invalid.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

Queued, thanks!