On 03.02.2020 12:21, Durrant, Paul wrote:
>> -----Original Message-----
>> From: Jan Beulich <jbeul...@suse.com>
>> Sent: 03 February 2020 11:06
>> To: Durrant, Paul <pdurr...@amazon.co.uk>
>> Cc: Wei Liu <w...@xen.org>; Xen Development List <xen-
>> de...@lists.xenproject.org>; Michael Kelley <mikel...@microsoft.com>; Wei
>> Liu <li...@microsoft.com>; Andrew Cooper <andrew.coop...@citrix.com>;
>> Roger Pau Monné <roger....@citrix.com>
>> Subject: Re: [PATCH v6 05/11] x86/hyperv: setup hypercall page
>>
>> On 03.02.2020 11:39, Durrant, Paul wrote:
>>>> -----Original Message-----
>>>> From: Wei Liu <w...@xen.org>
>>>> Sent: 31 January 2020 17:57
>>>> To: Xen Development List <xen-devel@lists.xenproject.org>
>>>> Cc: Durrant, Paul <pdurr...@amazon.co.uk>; Michael Kelley
>>>> <mikel...@microsoft.com>; Wei Liu <li...@microsoft.com>; Wei Liu
>>>> <w...@xen.org>; Jan Beulich <jbeul...@suse.com>; Andrew Cooper
>>>> <andrew.coop...@citrix.com>; Roger Pau Monné <roger....@citrix.com>
>>>> Subject: Re: [PATCH v6 05/11] x86/hyperv: setup hypercall page
>>>>
>>>> (Note to self)
>>>>
>>>> On Fri, Jan 31, 2020 at 05:49:24PM +0000, Wei Liu wrote:
>>>> [...]
>>>>> +static uint64_t generate_guest_id(void)
>>>>> +{
>>>>> + union hv_guest_os_id id;
>>>>> +
>>>>
>>>> id.raw = 0;
>>>
>>> Or just use a C99 initializer to set things up. A bit neater IMO.
>>
>> If you mean this for ...
>>
>>>>> + id.vendor = HV_XEN_VENDOR_ID;
>>>>> + id.major = xen_major_version();
>>>>> + id.minor = xen_minor_version();
>>
>> ... these three fields, then this won't work with rather old gcc
>> we still permit to be used. Using { .raw = 0 } would work afaict.
>>
>
> Not even { .vendor = HV_XEN_VENDOR_ID } ?
No, because of it being part of an unnamed (struct) member of
the union.
Jan
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