linux-kernel - Re: [PATCH 0/15] x86/xsaves: Optimize xstate context switch by xsaves/xrstors

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Date:	Mon, 26 May 2014 13:53:39 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	"Yu, Fenghua" <fenghua.yu@...el.com>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH 0/15] x86/xsaves: Optimize xstate context switch by xsaves/xrstors

On 05/26/2014 01:13 PM, Yu, Fenghua wrote:
> 
> So I don't see we need xsaves/xrstors in user space. But I could be
> wrong.
> 

XSAVES/XRSTORS are privileged.  The user-space equivalents are
XSAVEC/XRSTOR.

	-hpa


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