Re: [PATCH v2 1/2] conf: add xml element devices/pvpanic

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On 12/02/2013 06:32 PM, Hu Tao wrote:
> On Mon, Dec 02, 2013 at 02:34:44PM -0700, Eric Blake wrote:
>> On 12/01/2013 11:11 PM, Hu Tao wrote:
>>> This patch adds a new xml element devices/pvpanic to support qemu device
>>> pvpanic. It can be used to receive guest panic notification.
>>>
>>> Signed-off-by: Hu Tao <hutao@xxxxxxxxxxxxxx>
>>> ---
>>>  docs/formatdomain.html.in | 25 +++++++++++++++++
>>>  src/conf/domain_conf.c    | 68 +++++++++++++++++++++++++++++++++++++++++++++++
>>>  src/conf/domain_conf.h    |  9 +++++++
>>>  3 files changed, 102 insertions(+)
>>

>>
>>> +static int virDomainPvpanicDefFormat(virBufferPtr buf,
>>> +                                     virDomainPvpanicDefPtr def)
>>> +{
>>> +    if (def->ioport > 0) {
>>
>> Isn't this an off-by-one if someone explicitly requests port 0 (since
>> your parser initializes to -1 when left unspecified)?
> 
> port 0 means disable the device, so there is no need to add it when port
> is 0. But if you'd prefer to let the device handle port itself, then
> it's OK to add it in the case.

Then don't initialize port to -1.  Instead, in your parser reject an
explicit setting of 0, and use the default of 0 to mean unspecified port.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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