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Re: [Xen-devel] [PATCH v4 1/7] libxl: add definition of INVALID_DOMID to the API
- To: "Durrant, Paul" <pdurrant@xxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 31 Jan 2020 12:07:35 +0000
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- Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Fri, 31 Jan 2020 12:08:04 +0000
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On 31/01/2020 11:10, Durrant, Paul wrote:
>> -----Original Message-----
>> From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>> Sent: 31 January 2020 11:06
>> To: Durrant, Paul <pdurrant@xxxxxxxxxxxx>
>> Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>; xen-
>> devel@xxxxxxxxxxxxxxxxxxxx; Ian Jackson <ian.jackson@xxxxxxxxxxxxx>; Wei
>> Liu <wl@xxxxxxx>
>> Subject: Re: [Xen-devel] [PATCH v4 1/7] libxl: add definition of
>> INVALID_DOMID to the API
>>
>> On Fri, Jan 31, 2020 at 10:31:49AM +0000, Durrant, Paul wrote:
>>>> -----Original Message-----
>>>> From: Xen-devel <xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf Of
>>>> Roger Pau Monné
>>>> Sent: 22 January 2020 14:53
>>>> To: Durrant, Paul <pdurrant@xxxxxxxxxxxx>
>>>> Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>; xen-
>>>> devel@xxxxxxxxxxxxxxxxxxxx; Ian Jackson <ian.jackson@xxxxxxxxxxxxx>;
>> Wei
>>>> Liu <wl@xxxxxxx>
>>>> Subject: Re: [Xen-devel] [PATCH v4 1/7] libxl: add definition of
>>>> INVALID_DOMID to the API
>>>>
>>>> On Wed, Jan 22, 2020 at 02:44:40PM +0000, Paul Durrant wrote:
>>>>> Currently both xl and libxl have internal definitions of
>> INVALID_DOMID
>>>>> which happen to be identical. However, for the purposes of
>> describing
>>>> the
>>>>> behaviour of libxl_domain_create_new/restore() it is useful to have
>> a
>>>>> specified invalid value for a domain id.
>>>>>
>>>>> This patch therefore moves the libxl definition from
>> libxl_internal.h to
>>>>> libxl.h and removes the internal definition from xl_utils.h. The
>>>> hardcoded
>>>>> '-1' passed back via domcreate_complete() is then updated to
>>>> INVALID_DOMID
>>>>> and comment above libxl_domain_create_new/restore() is accordingly
>>>>> modified.
>>>> Urg, it's kind of ugly to add another definition of invalid domid when
>>>> there's already DOMID_INVALID in the public headers. I guess there's a
>>>> reason I'm missing for not using DOMID_INVALID instead of introducing
>>>> a new value?
>>>>
>>> TBH I don't know. As far as xl/libxl goes, domids are uint32_ts so maybe
>> DOMID_INVALID was for some reason not considered appropriate?
Read the commit message where I did the blanket change to use uint32_t.
c/s 5b42c82f55
Does this really need to enter the API?
~Andrew
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