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Subject: Re: [RFC v2 02/32] x86/tdx: Introduce INTEL_TDX_GUEST config option
To:     Randy Dunlap <rdunlap@infradead.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Andy Lutomirski <luto@kernel.org>,
        Dave Hansen <dave.hansen@intel.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Tony Luck <tony.luck@intel.com>
Cc:     Andi Kleen <ak@linux.intel.com>,
        Kirill Shutemov <kirill.shutemov@linux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
        Raj Ashok <ashok.raj@intel.com>,
        Sean Christopherson <seanjc@google.com>,
        linux-kernel@vger.kernel.org
References: <cover.1619458733.git.sathyanarayanan.kuppuswamy@linux.intel.com>
 <32870c547c6e143a8f42667c6087ee61dc07e90b.1619458733.git.sathyanarayanan.kuppuswamy@linux.intel.com>
 <a4faf7f0-27ab-9d39-a183-a9a696aae061@infradead.org>
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@linux.intel.com>
Message-ID: <e4fdc23e-71ef-db02-b05e-5ae55c1fadb2@linux.intel.com>
Date:   Mon, 26 Apr 2021 15:32:07 -0700
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On 4/26/21 2:09 PM, Randy Dunlap wrote:
> On 4/26/21 11:01 AM, Kuppuswamy Sathyanarayanan wrote:
>> Add INTEL_TDX_GUEST config option to selectively compile
>> TDX guest support.
>>
>> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>> Reviewed-by: Andi Kleen <ak@linux.intel.com>
>> Reviewed-by: Tony Luck <tony.luck@intel.com>
>> ---
>>   arch/x86/Kconfig | 15 +++++++++++++++
>>   1 file changed, 15 insertions(+)
>>
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index 6b4b682af468..932e6d759ba7 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -875,6 +875,21 @@ config ACRN_GUEST
>>   	  IOT with small footprint and real-time features. More details can be
>>   	  found in https://projectacrn.org/.
>>   
>> +config INTEL_TDX_GUEST
>> +	bool "Intel Trusted Domain eXtensions Guest Support"
>> +	depends on X86_64 && CPU_SUP_INTEL && PARAVIRT
>> +	depends on SECURITY
>> +	select PARAVIRT_XL
>> +	select X86_X2APIC
>> +	select SECURITY_LOCKDOWN_LSM
>> +	help
>> +	  Provide support for running in a trusted domain on Intel processors
>> +	  equipped with Trusted Domain eXtenstions. TDX is an new Intel
> 
> 	                                                   a new Intel
> 

Good catch. I will fix it in next version.

>> +	  technology that extends VMX and Memory Encryption with a new kind of
>> +	  virtual machine guest called Trust Domain (TD). A TD is designed to
>> +	  run in a CPU mode that protects the confidentiality of TD memory
>> +	  contents and the TD’s CPU state from other software, including VMM.
>> +
>>   endif #HYPERVISOR_GUEST
>>   
>>   source "arch/x86/Kconfig.cpu"
>>
> 
> 

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer