linux-kernel - Re: [RFC PATCH v2 03/20] x86: Secure Memory Encryption (SME) build enablement

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Date:   Wed, 7 Sep 2016 09:03:46 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Borislav Petkov <bp@...en8.de>
CC:     <linux-arch@...r.kernel.org>, <linux-efi@...r.kernel.org>,
        <kvm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
        <kasan-dev@...glegroups.com>, <linux-mm@...ck.org>,
        <iommu@...ts.linux-foundation.org>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Joerg Roedel <joro@...tes.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Alexander Potapenko <glider@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [RFC PATCH v2 03/20] x86: Secure Memory Encryption (SME) build
 enablement

On 09/02/2016 06:03 AM, Borislav Petkov wrote:
> On Mon, Aug 22, 2016 at 05:35:59PM -0500, Tom Lendacky wrote:
>> Provide the Kconfig support to build the SME support in the kernel.
>>
>> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
>> ---
>>  arch/x86/Kconfig |    9 +++++++++
>>  1 file changed, 9 insertions(+)
>>
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index c580d8c..131f329 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -1357,6 +1357,15 @@ config X86_DIRECT_GBPAGES
>>  	  supports them), so don't confuse the user by printing
>>  	  that we have them enabled.
>>  
>> +config AMD_MEM_ENCRYPT
>> +	bool "Secure Memory Encryption support for AMD"
> 
> 	     "AMD Secure Memory Encryption support"

Ok.

Thanks,
Tom

> 
>> +	depends on X86_64 && CPU_SUP_AMD
>> +	---help---
>> +	  Say yes to enable the encryption of system memory. This requires
>> +	  an AMD processor that supports Secure Memory Encryption (SME).
>> +	  The encryption of system memory is disabled by default but can be
>> +	  enabled with the mem_encrypt=on command line option.
>> +
>>  # Common NUMA Features
>>  config NUMA
>>  	bool "Numa Memory Allocation and Scheduler Support"
>