From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tom Lendacky <thomas.lendacky-5C7GfCeVMHo@public.gmane.org>
Subject: Re: [RFC PATCH v4 05/28] x86: Add Secure Memory Encryption (SME)
	support
Date: Tue, 28 Feb 2017 17:01:36 -0600
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To: Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
Cc: linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Brijesh Singh <brijesh.singh-5C7GfCeVMHo@public.gmane.org>, Toshimitsu Kani <toshi.kani-ZPxbGqLxI0U@public.gmane.org>, =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Matt Fleming <matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, Alexander Potapenko <glider-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, "H. Peter
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	Tsirkin" <mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Paolo Bonzini <pbonzini-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
List-Id: linux-efi@vger.kernel.org

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-5C7GfCeVMHo@public.gmane.org>
>
> ...
>
>> +++ 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-5C7GfCeVMHo@public.gmane.org>
>> + *
>> + * 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

>