test: Bypass attestation checks when built on arm64
test.py contains a config that boots a realm guest inside the host then in the guest, attempts attestation using the cca-workload-attestation tool. However, when this test runs on an arm64 machine, the tool is not present in the buildroot image. This causes the guest not to poweroff. Which means we hit the test timeout and the test fails.
I'm not sure exactly why the tool is not present, but [1] shows that it depends on some properties of the build host:
| config BR2_PACKAGE_CCA_WORKLOAD_ATTESTATION | bool "CCA Workload Attestation PoC" | depends on BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS | depends on BR2_PACKAGE_HOST_GO_TARGET_CGO_LINKING_SUPPORTS
Perhaps arm64 does not satisfy these requirements? That would explain the issue at least because this component would get disabled and not built into the buildroot image.
This all needs further investigation. So for now, let's bypass doing the attestation check if the tool is not present. This will at least mean we continue to get full coverage for x86 build hosts and will still allow testing that booting a guest in a realm works for arm64 build hosts.
Signed-off-by: Ryan Roberts ryan.roberts@arm.com