linux-kernel - Re: [PATCH v14 02/19] x86: Secure Launch Kconfig

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Message-ID: <227ab614-2d03-4ee5-9596-d515f9613dbf@oracle.com>
Date: Tue, 22 Apr 2025 12:32:21 -0700
From: ross.philipson@...cle.com
To: Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-integrity@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-crypto@...r.kernel.org,
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        iommu@...ts.linux.dev
Cc: dpsmith@...rtussolutions.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, dave.hansen@...ux.intel.com,
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        James.Bottomley@...senpartnership.com, peterhuewe@....de,
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        trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v14 02/19] x86: Secure Launch Kconfig

On 4/21/25 10:41 AM, Randy Dunlap wrote:
> Hi,
> 
> On 4/21/25 9:26 AM, Ross Philipson wrote:
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index 4b9f378e05f6..badde1e9742e 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -2001,6 +2001,17 @@ config EFI_RUNTIME_MAP
>>   
>>   	  See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
>>   
>> +config SECURE_LAUNCH
>> +	bool "Secure Launch support"
>> +	depends on X86_64 && X86_X2APIC && TCG_TIS && TCG_CRB && CRYPTO_LIB_SHA1 && CRYPTO_LIB_SHA256
> 
> It's normal to select needed library symbols instead of depending on them.
> Nothing else in the kernel tree uses depends on for these 2 Kconfig symbols.
> (CRYPTO_LIB_SHAxxx)

Yes good point, we will address this.

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.
>