Re: [RFC PATCH v4 05/28] x86: Add Secure Memory Encryption (SME) support

[Tom Lendacky]

On 2/25/2017 9:29 AM, Borislav Petkov wrote:
> On Thu, Feb 16, 2017 at 09:43:07AM -0600, Tom Lendacky wrote:
> > Add support for Secure Memory Encryption (SME). This initial support
> > provides a Kconfig entry to build the SME support into the kernel and
> > defines the memory encryption mask that will be used in subsequent
> > patches to mark pages as encrypted.
> >
> > Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
>
> ...
>
> > +++ b/arch/x86/include/asm/mem_encrypt.h
> > @@ -0,0 +1,42 @@
> > +/*
> > + * AMD Memory Encryption Support
> > + *
> > + * Copyright (C) 2016 Advanced Micro Devices, Inc.
> > + *
> > + * Author: Tom Lendacky <thomas.lendacky@xxxxxxx>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + */
> > +
> > +#ifndef __X86_MEM_ENCRYPT_H__
> > +#define __X86_MEM_ENCRYPT_H__
> > +
> > +#ifndef __ASSEMBLY__
> > +
> > +#ifdef CONFIG_AMD_MEM_ENCRYPT
> > +
> > +extern unsigned long sme_me_mask;
> > +
> > +static inline bool sme_active(void)
> > +{
> > +	return (sme_me_mask) ? true : false;
>
> 	return !!sme_me_mask;

Done.

Thanks,
Tom

>