Confidential computing technologies with manufacturer-rooted remote
attestation capabilities use a configfs subsystem called TSM to make attestation quotes accessible to user space.
For AMD SEV-SNP, the sev-guest driver must be present to be a provider
of the TSM backend.
The TSM subsystem is available in v6.7-rc1 and is required by current
GCE confidential compute machine families.
Please add CONFIG_REPORTS=m and CONFIG_SEV_GUEST=m to Linux kernel configuration to enable this capability.