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

From	Borislav Petkov <bp@alien8.de>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH v4 05/28] x86: Add Secure Memory Encryption (SME) support
Date	2017-02-25 17:30 +0100
Message-ID	<teNol-23w-5@gated-at.bofh.it> (permalink)
References	<tbyvy-1iO-79@gated-at.bofh.it> <tbPwm-47n-25@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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@amd.com>

...

> +++ 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@amd.com>
> + *
> + * 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;

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

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Re: [RFC PATCH v4 05/28] x86: Add Secure Memory Encryption (SME)  support Borislav Petkov <bp@alien8.de> - 2017-02-25 17:30 +0100

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