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List:       linux-kernel
Subject:    Re: [RFC PATCH v4 05/28] x86: Add Secure Memory Encryption (SME) support
From:       Tom Lendacky <thomas.lendacky () amd ! com>
Date:       2017-02-28 23:01:36
Message-ID: 9ea3d871-e4ae-2408-1bd0-9820cc5826d6 () amd ! com
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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@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;

Done.

Thanks,
Tom

>
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