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Hector Cao
86df79275d
The measurements for confidential computing has been introduced in the commit4c76565b6(efi/tpm: Add EFI_CC_MEASUREMENT_PROTOCOL support). Recently the patch30708dfe3(tpm: Disable the tpm verifier if the TPM device is not present) has been introduced to optimize the memory usage when a TPM device is not available on platforms. This fix prevents the tpm module to be loaded on confidential computing platforms, e.g. Intel machines with TDX enabled, where the TPM device is not available. In this patch, we propose to load the tpm module for this use case by generalizing the tpm feature detection in order to cover CC platforms. Basically, we do it by detecting the availability of the EFI_CC_MEASUREMENT_PROTOCOL EFI protocol. Fixes: https://savannah.gnu.org/bugs/?65821 Fixes:30708dfe3(tpm: Disable the tpm verifier if the TPM device is not present) Signed-off-by: Hector Cao <hector.cao@canonical.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>