Re: [Qemu-trivial] [Qemu-devel] [PATCH] ide: log error when trying to use ATAPI overlapping features

["Andreas Färber" <afaerber@suse.de>]

Am 11.02.2013 15:01, schrieb Markus Armbruster:
> Kevin Wolf <kwolf@redhat.com> writes:
> 
>> Am 11.02.2013 14:27, schrieb Stefan Hajnoczi:
>>> On Sun, Feb 10, 2013 at 11:12:11PM +0100, Hervé Poussineau wrote:
>>>>
>>>> Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
>>>> ---
>>>>  hw/ide/core.c |    4 +++-
>>>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/hw/ide/core.c b/hw/ide/core.c
>>>> index 3743dc3..f0ab1a8 100644
>>>> --- a/hw/ide/core.c
>>>> +++ b/hw/ide/core.c
>>>> @@ -1394,8 +1394,10 @@ void ide_exec_cmd(IDEBus *bus, uint32_t val)
>>>>          break;
>>>>      case WIN_PACKETCMD:
>>>>          /* overlapping commands not supported */
>>>> -        if (s->feature & 0x02)
>>>> +        if (s->feature & 0x02) {
>>>> +            qemu_log_mask(LOG_UNIMP, "ide: overlapping command not supported");
>>>
>>> qemu_log_*() isn't used much in hw/.
>>>
>>> I think we need to side-track this patch email to figure out what to
>>> use:
>>>
>>> fprintf(stderr) - some warnings/errors use this
>>> error_report() - goes to the monitor, if possible, otherwise stderr
>>
>> These look wrong to me.
> 
> "Wrong" is a bit strong, in particular since there's ample precedence
> for these uses.
> 
>>> qemu_log_*() - goes to the qemu log, seems a little TCG-centric
>>
>> I would suggest either this or just trace points. (And by the way, it's
>> a pity that -d is so TCG-centric, it's been more than once the reason
>> why I disabled KVM when debugging a guest... Having at least -d int
>> would be so useful.)
> 
> Tracepoints don't really fit when we want to report the guest does
> something we don't handle.  Users deserve fair warning then, don't they?
> 
> Could qemu_log() & friends be made fit for general use?  What's missing?

Blue already did some work to make it more usable, and I believe Peter
adopted LOG_UNIMPL for ARM devices in place of hw_error(), which is
another reporting option people have chosen in the past (but which
allows a guest to exit the QEMU process).

Andreas

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