linux-kernel - Re: [PATCH 1/6] x86: add SGX definition to cpufeature

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Message-ID: <87a8kh5v15.fsf@tassilo.jf.intel.com>
Date:	Mon, 25 Apr 2016 12:48:54 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Kai Huang <kai.huang@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"maintainer\:X86 ARCHITECTURE \(32-BIT AND 64-BIT\)" <x86@...nel.org>,
	Borislav Petkov <bp@...e.de>,
	Andy Lutomirski <luto@...nel.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Huang Rui <ray.huang@....com>,
	Mathias Krause <minipli@...glemail.com>,
	Wan Zongshun <Vincent.Wan@....com>,
	"open list\:X86 ARCHITECTURE \(32-BIT AND 64-BIT\)" 
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] x86: add SGX definition to cpufeature

Andy Lutomirski <luto@...capital.net> writes:

> On Mon, Apr 25, 2016 at 10:34 AM, Jarkko Sakkinen
> <jarkko.sakkinen@...ux.intel.com> wrote:
>> From: Kai Huang <kai.huang@...ux.intel.com>
>
> Should this come with a nosgx boot option and an IA32_FEATURE_CONTROL
> check to disable the feature if BIOS doesn't support it?

You can already disable every CPUID feature at boot with clearcpuid=...
No point in adding redundant options for everything.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only