linux-kernel - Re: [PATCH 0/6] Intel Secure Guard Extensions

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Date:	Mon, 25 Apr 2016 22:03:56 +0300
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...e.de>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	"open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
	Ingo Molnar <mingo@...nel.org>,
	Kristen Carlson Accardi <kristen@...ux.intel.com>,
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	Mathias Krause <minipli@...glemail.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wan Zongshun <Vincent.Wan@....com>
Subject: Re: [PATCH 0/6] Intel Secure Guard Extensions

On Mon, Apr 25, 2016 at 10:53:52AM -0700, Greg KH wrote:
> On Mon, Apr 25, 2016 at 08:34:07PM +0300, Jarkko Sakkinen wrote:
> > Intel(R) SGX is a set of CPU instructions that can be used by
> > applications to set aside private regions of code and data.  The code
> > outside the enclave is disallowed to access the memory inside the
> > enclave by the CPU access control.
> > 
> > The firmware uses PRMRR registers to reserve an area of physical memory
> > called Enclave Page Cache (EPC). There is a hardware unit in the
> > processor called Memory Encryption Engine. The MEE encrypts and decrypts
> > the EPC pages as they enter and leave the processor package.
> > 
> > Jarkko Sakkinen (5):
> >   x86, sgx:  common macros and definitions
> >   intel_sgx: driver for Intel Secure Guard eXtensions
> >   intel_sgx: ptrace() support for the driver
> >   intel_sgx: driver documentation
> >   intel_sgx: TODO file for the staging area
> > 
> > Kai Huang (1):
> >   x86: add SGX definition to cpufeature
> > 
> >  Documentation/x86/intel_sgx.txt               |  86 +++
> >  arch/x86/include/asm/cpufeature.h             |   1 +
> >  arch/x86/include/asm/sgx.h                    | 253 +++++++
> 
> Why are you asking for this to go into staging?
> 
> What is keeping it out of the "real" part of the kernel tree?

Now that I think of it nothing as long as the API is fixed the way you
suggested and my TODO list is cleared.

I think I prepare a new version of the patches and point it directly
to arch/x86.

> And staging code is self-contained, putting files in arch/* isn't ok for
> it, which kind of implies that you should get this merged correctly.
> 
> I need a lot more information here before I can take this code...
> 
> thanks,
> 
> greg k-h

/Jarkko