openhcl: add direct TVM host certification flow

[harshvirMangla]

Summary

• Adds a HostCall implementation over the existing VBS report hypercall.
• Requests the fixed 396-byte TVM host certification report only when the feature is enabled.
• Keeps legacy Trusted Launch requests at zero report bytes.
• Reuses the existing software-attested TPM lifecycle and attestation-report NV index.
• Gates the flow behind DPS bit 5 and HCL_TVM_HOST_CERTIFICATION, both off by default.

Validation

• Rust formatting passed.
• Targeted Windows Cargo checks, Clippy, and tests passed.
• Linux Cargo checks and targeted tests passed.
• PR validation will rerun against the rebased head.

Dependencies

Requires the matching os.2020 SVC and VID producer plus IGVM Agent, Provisioner, A-LPI, and MAA changes.

[Copilot]

Pull request overview

Adds an opt-in “direct TVM host certification” path for Host (non-isolated) attestation by introducing a host-certified TVM report type and plumbing a new Management VTL feature flag + OpenHCL option through to the TPM AK-cert request flow. This extends existing IGVM attestation request generation while preserving the legacy Trusted Launch behavior of requesting zero report bytes.

Changes:

• Add a new Management VTL feature flag (tvm_host_certification) and validate its default/bit position.
• Plumb HCL_TVM_HOST_CERTIFICATION through underhill_core into TPM AK-cert request generation and attestation-type selection.
• Introduce a Host-certified TVM report variant and a new tee_call::HostCall implementation that reuses the VBS report hypercall and returns a fixed 396-byte report.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
vm/devices/get/get_protocol/src/dps_json.rs	Adds tvm_host_certification to ManagementVtlFeatures and a unit test asserting it maps to bit 5 and defaults off.
petri/src/vm/hyperv/powershell.rs	Mirrors the new Management VTL feature flag in Hyper-V PS flag packing.
openhcl/underhill_core/src/worker.rs	Plumbs the flag into DPS config and uses it to select the Host AK-cert request/attestation path.
openhcl/underhill_core/src/options.rs	Adds parsing/storage for HCL_TVM_HOST_CERTIFICATION.
openhcl/underhill_core/src/lib.rs	Threads the new option into worker launch configuration.
openhcl/underhill_core/src/emuplat/tpm.rs	Extends TPM AK-cert request helper plumbing to carry the host-certification switch and resolve tee_call::HostCall.
openhcl/underhill_attestation/src/igvm_attest/mod.rs	Adds ReportType::TvmHostCertified, maps it through request creation, and adds tests for legacy vs host-certified request sizing.
openhcl/tee_call/src/lib.rs	Adds TeeType::Host, factors VBS report retrieval into a helper, and implements HostCall returning a fixed 396-byte report.

[mingweishih]

why do we need this additional API if it does the same as VBS?

[mingweishih]

AFAIK, currently TVM_REPORT_SIZE is 0

[mingweishih]

Having a Host TeeType is a bit confusing

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[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated no new comments.