linux-kernel - Re: [RFC PATCH v1 02/18] x86: Secure Memory Encryption (SME) build enablement

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Message-ID: <20160427153010.GA7861@amd>
Date:	Wed, 27 Apr 2016 17:30:10 +0200
From:	Pavel Machek <pavel@....cz>
To:	Tom Lendacky <thomas.lendacky@....com>
Cc:	linux-arch@...r.kernel.org, linux-efi@...r.kernel.org,
	kvm@...r.kernel.org, linux-doc@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
	linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
	Radim Krčmář <rkrcmar@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Jonathan Corbet <corbet@....net>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Joerg Roedel <joro@...tes.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Alexander Potapenko <glider@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [RFC PATCH v1 02/18] x86: Secure Memory Encryption (SME) build
 enablement

On Wed 2016-04-27 10:17:36, Tom Lendacky wrote:
> On 03/22/2016 08:01 AM, Pavel Machek wrote:
> > On Tue 2016-04-26 17:56:14, Tom Lendacky wrote:
> >> Provide the Kconfig support to build the SME support in the kernel.
> > 
> > 
> > Probably should go last in the series?
> 
> Yeah, I've seen arguments both ways for this. Doing it early
> allows compiling and testing with it enabled and doing it late
> doesn't enable anything until it's all there. I just chose the
> former.

Doing it early will break bisect, right?
							Pavel

> >> +config AMD_MEM_ENCRYPT
> >> +	bool "Secure Memory Encryption support for AMD"
> >> +	depends on X86_64 && CPU_SUP_AMD
> >> +	---help---
> >> +	  Say yes to enable the encryption of system memory. This requires
> >> +	  an AMD processor that supports Secure Memory Encryption (SME).
> >> +	  The encryption of system memory is disabled by default but can be
> >> +	  enabled with the mem_encrypt=on command line option.
> >> +
> >>  # Common NUMA Features
> >>  config NUMA
> >>  	bool "Numa Memory Allocation and Scheduler Support"
> > 

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