linux-kernel - Re: [PATCHv4 18/18] x86: Introduce CONFIG_X86_INTEL

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Date:   Wed, 27 Jun 2018 16:48:37 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Dave Hansen <dave.hansen@...el.com>,
        Kai Huang <kai.huang@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv4 18/18] x86: Introduce CONFIG_X86_INTEL_MKTME

On 06/27/2018 02:57 PM, Kirill A. Shutemov wrote:
> On Tue, Jun 26, 2018 at 05:30:12PM +0000, Randy Dunlap wrote:
>> On 06/26/2018 07:22 AM, Kirill A. Shutemov wrote:
>>> Add new config option to enabled/disable Multi-Key Total Memory
>>> Encryption support.
>>>
>>> MKTME uses MEMORY_PHYSICAL_PADDING to reserve enough space in per-KeyID
>>> direct mappings for memory hotplug.
>>>
>>> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
>>> ---
>>>  arch/x86/Kconfig | 19 ++++++++++++++++++-
>>>  1 file changed, 18 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>>> index fa5e1ec09247..9a843bd63108 100644
>>> --- a/arch/x86/Kconfig
>>> +++ b/arch/x86/Kconfig
>>> @@ -1523,6 +1523,23 @@ config ARCH_USE_MEMREMAP_PROT
>>>  	def_bool y
>>>  	depends on AMD_MEM_ENCRYPT
>>>  
>>> +config X86_INTEL_MKTME
>>> +	bool "Intel Multi-Key Total Memory Encryption"
>>> +	select DYNAMIC_PHYSICAL_MASK
>>> +	select PAGE_EXTENSION
>>> +	depends on X86_64 && CPU_SUP_INTEL
>>> +	---help---
>>> +	  Say yes to enable support for Multi-Key Total Memory Encryption.
>>> +	  This requires an Intel processor that has support of the feature.
>>> +
>>> +	  Multikey Total Memory Encryption (MKTME) is a technology that allows
>>> +	  transparent memory encryption in and upcoming Intel platforms.
>>
>> huh?  Maybe drop the "and"?
> 
> Ugh.. It has to be "an".

an ... platform.
or
in upcoming Intel platforms.


-- 
~Randy