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Re: [PATCH v5 04/18] xen/cpufreq: introduce new sub-hypercall to propagate CPPC data
- To: "Penny, Zheng" <penny.zheng@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 20 Jun 2025 07:55:27 +0200
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- Cc: "Huang, Ray" <Ray.Huang@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, "Orzel, Michal" <Michal.Orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 20 Jun 2025 05:55:56 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.06.2025 08:43, Penny, Zheng wrote:
> [Public]
>
>> -----Original Message-----
>> From: Jan Beulich <jbeulich@xxxxxxxx>
>> Sent: Thursday, June 12, 2025 12:10 AM
>> To: Penny, Zheng <penny.zheng@xxxxxxx>
>> Cc: Huang, Ray <Ray.Huang@xxxxxxx>; Andrew Cooper
>> <andrew.cooper3@xxxxxxxxxx>; Roger Pau Monné <roger.pau@xxxxxxxxxx>;
>> Anthony PERARD <anthony.perard@xxxxxxxxxx>; Orzel, Michal
>> <Michal.Orzel@xxxxxxx>; Julien Grall <julien@xxxxxxx>; Stefano Stabellini
>> <sstabellini@xxxxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx
>> Subject: Re: [PATCH v5 04/18] xen/cpufreq: introduce new sub-hypercall to
>> propagate CPPC data
>>
>> On 27.05.2025 10:48, Penny Zheng wrote:
>>> @@ -635,6 +641,124 @@ out:
>>> --- a/xen/include/public/platform.h
>>> +++ b/xen/include/public/platform.h
>>> @@ -363,6 +363,7 @@ DEFINE_XEN_GUEST_HANDLE(xenpf_getidletime_t);
>>> +struct xen_processor_cppc {
>>> + uint8_t flags; /* flag for CPPC sub info type */
>>
>> A common way of commenting on such would be /* XEN_CPPC_... */.
>>
>> In any event, here and ...
>>
>>> + uint8_t pad[3]; /* padding and must be zero */
>>
>> ... here (and of course anywhere else) - please adhere to designated comment
>> style.
>
> Apart from Capital for the first letter, do designated comment style include
> format like: IN/OUT: xxx?
Comment style applies everywhere; the IN/OUT annotations in public headers are
generally desirable to have imo, yet for a padding field I'm not quite seeing
a need for such (if the caller passes in zeroes, the field will stay zeroed
unless the hypervisor actively altered the contents; IOW such fields simply
need to be zero at all times).
Jan
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