Re: [PATCH v3 1/1] x86/elf: Add a new .note section containing xfeatures buffer layout info to x86 core files

["Balasubrmanian, Vignesh" <vigbalas@amd.com>]

On 7/13/2024 4:12 PM, Thomas Gleixner wrote:
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>
>
> On Fri, Jul 12 2024 at 15:16, Vignesh Balasubramanian wrote:
>> diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
>> index 1fb83d477..cad37090b 100644
>> --- a/arch/x86/include/asm/elf.h
>> +++ b/arch/x86/include/asm/elf.h
>> @@ -13,6 +13,15 @@
>>   #include <asm/auxvec.h>
>>   #include <asm/fsgsbase.h>
>>
>> +struct xfeat_component {
>> +     u32 type;
>> +     u32 size;
>> +     u32 offset;
>> +     u32 flags;
>> +} __packed;
>> +
>> +_Static_assert(sizeof(struct xfeat_component)%4 == 0, "xfeat_component is not aligned");
> This struct is only used in xstate.c and asm/elf.h is not a UAPI
> header. So what's the point of declaring it in the header instead of
> xtsate.c?
>
> If this needs to provided for user space consumption, then it want's to
> be in a UAPI header, no?
Our initial idea is to pass the "struct xfeat_component" through "glibc".
is "include/uapi/linux/elf.h" proper header to add this ?

I couldn't see any proper header inside "arch/x86/include/uapi/asm/".

Please advise.


thanks,
vigneshbalu
> Thanks,
>
>          tglx