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

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Message-ID: <5720F1D6.7020400@arm.com>
Date:	Wed, 27 Apr 2016 18:07:34 +0100
From:	Robin Murphy <robin.murphy@....com>
To:	Pavel Machek <pavel@....cz>, Borislav Petkov <bp@...en8.de>
Cc:	linux-efi@...r.kernel.org, kvm@...r.kernel.org,
	Radim Krčmář <rkrcmar@...hat.com>,
	Matt Fleming <matt@...eblueprint.co.uk>, x86@...nel.org,
	linux-mm@...ck.org, Alexander Potapenko <glider@...gle.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-arch@...r.kernel.org,
	Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
	kasan-dev@...glegroups.com, Ingo Molnar <mingo@...hat.com>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Tom Lendacky <thomas.lendacky@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [RFC PATCH v1 02/18] x86: Secure Memory Encryption (SME) build
 enablement

On 27/04/16 17:41, Pavel Machek wrote:
> On Wed 2016-04-27 17:41:40, Borislav Petkov wrote:
>> On Wed, Apr 27, 2016 at 05:30:10PM +0200, Pavel Machek wrote:
>>> Doing it early will break bisect, right?
>>
>> How exactly? Please do tell.
>
> Hey look, SME slowed down 30% since being initially merged into
> kernel!

As opposed to "well, bisection shows these n+1 complicated changes are 
all fine and the crash is down to this Kconfig patch", presumably. I'm 
sure we all love spending a whole afternoon only to find that, right? :P

Robin.

> 									Pavel
>