[libvirt] [PATCH] qemu: output error when try to hotplug unsupport console

[Ján Tomko]

On 11/26/2014 11:02 AM, lhuang wrote:
> 
> On 11/26/2014 12:17 AM, Pavel Hrdina wrote:
>> On 11/17/2014 03:31 PM, Luyao Huang wrote:
>>> https://bugzilla.redhat.com/show_bug.cgi?id=1164627
>>>
>>> When try to use attach-device to hotplug a qemu
>>> unsupport sonsole, command will return success,
>>> and add a console in vm's xml.But this doesn't work
>>> in qemu, qemu doesn't support these console.Add
>>> a error output when try to hotplug a unsupport console
>>> in qemuBuildConsoleChrDeviceStr.
>>>
>>> Signed-off-by: Luyao Huang <lhuang at redhat.com>
>>> ---
>>>   src/qemu/qemu_command.c | 6 +++++-
>>>   1 file changed, 5 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
>>> index 1399ce4..2bf4a83 100644
>>> --- a/src/qemu/qemu_command.c
>>> +++ b/src/qemu/qemu_command.c
>>> @@ -10069,13 +10069,17 @@ qemuBuildConsoleChrDeviceStr(char **deviceStr,
>>>           break;
>>>
>>>       case VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_SERIAL:
>>> +        break;
>>>       case VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_NONE:
>>>       case VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_XEN:
>>>       case VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_UML:
>>>       case VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_LXC:
>>>       case VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_OPENVZ:
>>>       case VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_LAST:
>>> -        break;
>>> +        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
>>> +                          _("unsupported console target type %s"),
>>> + NULLSTR(virDomainChrConsoleTargetTypeToString(chr->targetType)));
>>
>> Wrong indentation
> Thanks for pointing out
>>
>>> +        return ret;
>>>       }
>>>
>>>       ret = 0;
>>>
>>
>> Otherwise it seems good, bud what about the case that you will attach
>> unsupported device to offline domain? It is still possible but the
>> domain cannot be started afterwards. You should probably take care of
>> that too.
>>
> Eww, i thought that before, and i have a question about attach unsupported
> device to a offline domain.
> 
> If we forbid attaching a unsupported device, is it means we should also forbid
> editing or defining a guest with a unsupported device?(because domain cannot
> start with these settings). I thinks it will be a big work. Actually, I just
> don't
> know when we try to set a invalid things to a offline domain, which way we should
> forbid and which way we can allow it.
> 

If we allowed defining a guest with an unsupported device before, I think we
should only report the error when the user tries to start it.

Otherwise it would disappear from the domain list on libvirt update and the
user can't fix the problem via libvirt.

Jan

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