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Re: [PATCH 05/26] x86, pkey: add PKRU xsave fields and data structure(s)

Started byThomas Gleixner <tglx@linutronix.de>
First post2015-09-22 22:00 +0200
Last post2015-09-22 22:00 +0200
Articles 2 — 2 participants

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  Re: [PATCH 05/26] x86, pkey: add PKRU xsave fields and data  structure(s) Thomas Gleixner <tglx@linutronix.de> - 2015-09-22 22:00 +0200
    Re: [PATCH 05/26] x86, pkey: add PKRU xsave fields and data  structure(s) Dave Hansen <dave@sr71.net> - 2015-09-22 22:00 +0200

#1230894 — Re: [PATCH 05/26] x86, pkey: add PKRU xsave fields and data structure(s)

FromThomas Gleixner <tglx@linutronix.de>
Date2015-09-22 22:00 +0200
SubjectRe: [PATCH 05/26] x86, pkey: add PKRU xsave fields and data structure(s)
Message-ID<qbBTk-6Qf-13@gated-at.bofh.it>
On Wed, 16 Sep 2015, Dave Hansen wrote:
> --- a/arch/x86/kernel/fpu/xstate.c~pkeys-03-xsave	2015-09-16 10:48:13.340060126 -0700
> +++ b/arch/x86/kernel/fpu/xstate.c	2015-09-16 10:48:13.344060307 -0700
> @@ -23,6 +23,8 @@ static const char *xfeature_names[] =
>  	"AVX-512 opmask"		,
>  	"AVX-512 Hi256"			,
>  	"AVX-512 ZMM_Hi256"		,
> +	"unknown xstate feature (8)"	,

It's not unknown. It's PT, right?

> +	"Protection Keys User registers",
>  	"unknown xstate feature"	,
>  };

Thanks,

	tglx
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#1230897

FromDave Hansen <dave@sr71.net>
Date2015-09-22 22:00 +0200
Message-ID<qbBTk-6Qf-21@gated-at.bofh.it>
In reply to#1230894
On 09/22/2015 12:53 PM, Thomas Gleixner wrote:
> On Wed, 16 Sep 2015, Dave Hansen wrote:
>> --- a/arch/x86/kernel/fpu/xstate.c~pkeys-03-xsave	2015-09-16 10:48:13.340060126 -0700
>> +++ b/arch/x86/kernel/fpu/xstate.c	2015-09-16 10:48:13.344060307 -0700
>> @@ -23,6 +23,8 @@ static const char *xfeature_names[] =
>>  	"AVX-512 opmask"		,
>>  	"AVX-512 Hi256"			,
>>  	"AVX-512 ZMM_Hi256"		,
>> +	"unknown xstate feature (8)"	,
> 
> It's not unknown. It's PT, right?

Yes, it's the Processor Trace state.

I'll give it a real name and also a comment about it being unused.
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