Re: [Xen-devel] [PATCH v7 04/11] public: xen.h: add definitions for UUID handling

[Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>]

Hi Konrad,

On 05.10.17 16:03, Konrad Rzeszutek Wilk wrote:
> On Thu, Oct 05, 2017 at 12:00:20AM +0300, Volodymyr Babchuk wrote:
> > Added type xen_uuid_t. This type represents UUID as an array of 16
> > bytes in big endian format.
> >
> > Added macro XEN_DEFINE_UUID that constructs UUID in the usual way:
> >
> >   XEN_DEFINE_UUID(0x00112233, 0x4455, 0x6677, 0x8899,
> >                 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff)
> >
> > will construct UUID 00112233-4455-6677-8899-aabbccddeeff presented as
> >   {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88,
> >    0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff}
> >
> > NB: This is compatible with Linux kernel and with libuuid, but it is not
> > compatible with Microsoft, as they use mixed-endian encoding (some
> > components are little-endian, some are big-endian).
> Oh boy. What a mess.
>
> Do we care about Microsoft for this or is this more for information
> purpose?
This is for information. Problem is that XEN already defines EFI_GUID 
which uses MS-style encoding. It is used in EFI code only, but I think 
it is worth to explain differences.
There was discussion at [1]
[...]

[1] http://markmail.org/message/cawi6f33spqg4hf5

Thanks,

Volodymyr

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