UEFI reference to RISC-V CC

[steven-bellock]

#118 inspired me to look at the published UEFI specification, which has https://uefi.org/specs/UEFI/2.11/38_Confidential_Computing.html#risc-v-ap-tee and references AP-TEE, the name of this task group, rather than CoVE. Should this be changed, in a backwards compatible way, to CoVE? Ie

#define EFI_CC_TYPE_RISCV_APTEE    3
#define EFI_CC_TYPE_RISCV_COVE (EFI_CC_TYPE_RISCV_APTEE)

@jyao1 might know.

[rsahita]

yeah @jyao1 can you please update? thanks

[jyao1]

I checked #29.

It seems we use #define EFI_CC_TYPE_RISCV_APTEE 3 in the ECR.
UEFI 1.11 is just released. Even we submit ECR now. The next release might be another year.

On the other hand, I don't think using TG name is a big issue. E.g, we always use TCG_EVENT_LOG, not TPM _EVENT_LOG. It just means the TCG defined Event Log. Here it can be interpreted as AP-TEE TG defined CC type.

Please let me know your thought.

[rsahita]

Seems ok to me to keep it (we can update the note in the COVE spec calling out the define name used).

[steven-bellock]

Even in #29 (comment) you've already got EFI_CC_TYPE_RISCV_COVE so that seems like the right choice. Once CoVE is published AP-TEE will probably be forgotten. UEFI can keep EFI_CC_TYPE_RISCV_APTEE in UEFI 1.12 for backwards compatibility, but just have it deprecated in favor of the EFI_CC_TYPE_RISCV_COVE name.