linux-kernel - Re: [PATCH v4 07/10] x86/xsaves: Fix PTRACE frames for XSAVES

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Message-ID: <5723C6D3.6020600@linux.intel.com>
Date:	Fri, 29 Apr 2016 13:40:51 -0700
From:	Dave Hansen <dave.hansen@...ux.intel.com>
To:	Borislav Petkov <bp@...e.de>
Cc:	Yu-cheng Yu <yu-cheng.yu@...el.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...nel.org>,
	Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
	"Ravi V. Shankar" <ravi.v.shankar@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [PATCH v4 07/10] x86/xsaves: Fix PTRACE frames for XSAVES

On 04/29/2016 01:38 PM, Borislav Petkov wrote:
> On Fri, Apr 29, 2016 at 01:16:59PM -0700, Dave Hansen wrote:
>> > We probably want a software X86_FEATURE_OS_XSAVES or something.
> ... or a simple variable.

I think we do some instruction patching based on it, so I was just
suggesting the software X86_FEATURE because it would plug in to the
existing scheme easier.