2024-02-14 22:32:16

by Ross Philipson

Subject: [PATCH v8 03/15] x86: Secure Launch Kconfig

Initial bits to bring in Secure Launch functionality. Add Kconfig
options for compiling in/out the Secure Launch code.

Signed-off-by: Ross Philipson <[email protected]>
---
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
+ depends on X86_64 && X86_X2APIC
+ 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

2024-02-15 07:59:49

by Ard Biesheuvel

Subject: Re: [PATCH v8 03/15] x86: Secure Launch Kconfig

On Wed, 14 Feb 2024 at 23:31, Ross Philipson <[email protected]> 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 <[email protected]>
> ---
> 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.

> + depends on X86_64 && X86_X2APIC

This depends on CONFIG_TCG_TPM as well (I got build failures without it)

> + 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
>

2024-02-15 22:21:00

by Ross Philipson

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 <[email protected]> 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 <[email protected]>
>> ---
>> 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
>>
>