attester: az_snp_vtpm: Check cpuid bits in detect_platform() #169
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It took a while to realize that we can check cpuid registers exposed by Hyper-V to determine whether we are in an SNP VM that can use the az-snp-vtpm attester. Rework detect_platform() to perform these checks. Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>
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What happened with this PR? |
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I think we can revive it and extend it with tdx. the current heuristic to probe tpm works, but it's a bit noisy. |
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It took a while to realize that we can check cpuid registers exposed by Hyper-V to determine whether we are in an SNP VM that can use the az-snp-vtpm attester. Rework detect_platform() to perform these checks.
Closes: confidential-containers/attestation-agent#220