linux-kernel - Re: [PATCH v8 03/15] x86: Secure Launch Kconfig

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Date: Thu, 15 Feb 2024 14:20:07 -0800
From: ross.philipson@...cle.com
To: Ard Biesheuvel <ardb@...nel.org>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-integrity@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-crypto@...r.kernel.org, kexec@...ts.infradead.org,
        linux-efi@...r.kernel.org, dpsmith@...rtussolutions.com,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        dave.hansen@...ux.intel.com, mjg59@...f.ucam.org,
        James.Bottomley@...senpartnership.com, peterhuewe@....de,
        jarkko@...nel.org, jgg@...pe.ca, luto@...capital.net,
        nivedita@...m.mit.edu, herbert@...dor.apana.org.au,
        davem@...emloft.net, kanth.ghatraju@...cle.com,
        trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v8 03/15] x86: Secure Launch Kconfig

On 2/14/24 11:59 PM, Ard Biesheuvel wrote:
> On Wed, 14 Feb 2024 at 23:31, Ross Philipson <ross.philipson@...cle.com> wrote:
>>
>> Initial bits to bring in Secure Launch functionality. Add Kconfig
>> options for compiling in/out the Secure Launch code.
>>
>> Signed-off-by: Ross Philipson <ross.philipson@...cle.com>
>> ---
>>   arch/x86/Kconfig | 12 ++++++++++++
>>   1 file changed, 12 insertions(+)
>>
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index 5edec175b9bf..d96d75f6f1a9 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -2071,6 +2071,18 @@ config EFI_RUNTIME_MAP
>>
>>            See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
>>
>> +config SECURE_LAUNCH
>> +       bool "Secure Launch support"
>> +       default n
> 
> 'n' is already the default, so you can drop this line.

Ack

> 
>> +       depends on X86_64 && X86_X2APIC
> 
> This depends on CONFIG_TCG_TPM as well (I got build failures without it)

Yes I will add that. I may have to add a couple of other things too.

Thanks
Ross

> 
>> +       help
>> +          The Secure Launch feature allows a kernel to be loaded
>> +          directly through an Intel TXT measured launch. Intel TXT
>> +          establishes a Dynamic Root of Trust for Measurement (DRTM)
>> +          where the CPU measures the kernel image. This feature then
>> +          continues the measurement chain over kernel configuration
>> +          information and init images.
>> +
>>   source "kernel/Kconfig.hz"
>>
>>   config ARCH_SUPPORTS_KEXEC
>> --
>> 2.39.3
>>
>