Re: [PATCH v8 1/5] x86/tdx: Add TDX Guest attestation interface driver

Sathyanarayanan Kuppuswamy
2022-07-06T22:27:47Z

On 7/5/22 3:31 PM, Kai Huang wrote:
> On Tue, 2022-07-05 at 14:21 -0700, Sathyanarayanan Kuppuswamy wrote:
>> SGX is a related feature. It also uses IOCTL approach for enclave provisioning.
>>
>> arch/x86/kernel/cpu/sgx/ioctl.c
>
> SGX isn't a good example here. The IOCTLs are used to create enclaves, but not
> for attestation. SGX attestation relies on enclave itself to get/verify the
> report, etc, so has no interaction with the kernel.

If you are looking for an attestation specific example, you can only check the AMD
code.

https://patchwork.kernel.org/project/linux-mm/patch/20220307213356.2797205-44-brijesh.singh@amd.com/

Also, sev_get_attestation_report() in arch/x86/kvm/svm/sev.c also implements attestation
IOCTL specific to KVM.

--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer