petri: add support for Hyper-V + SCSI-to-SCSI relay, use it

[mattkur]

In doing #2137, I realized that I had done almost all the work required to do scsi-to-scsi relay for the Hyper-V backend.

petri:

• Add infra to set VTL2 settings for a Hyper-V test backend.
• Return the SCSI controller VSID when one is added (required to reference that controller in VTL2 settings...).
• Add a hyperv_test macro, so that the test can get access to the Hyper-V Petri backend (like openvmm_test).

vmm_tests:

• Write a test that uses this infra.

[Copilot]

Pull Request Overview

Adds infrastructure to configure and update VTL2 settings for Hyper-V VMs, enabling SCSI-to-SCSI relay and a corresponding integration test. Key changes introduce a new hyperv_test macro, extend the Hyper-V backend to set/query VTL2 settings, return VSID information when adding SCSI controllers, and add a test exercising vmbus relay with a VTL2-backed SCSI disk.

• Add Hyper-V VTL2 settings plumbing (set/get, PowerShell support, runtime caching).
• Extend add_scsi_controller to return (controller_number, VSID) and propagate through backend.
• Introduce storvsp_hyperv test using new hyperv_test macro and VTL2 storage relay setup.

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
vmm_tests/tests/tests/x86_64/storage.rs	Adds Hyper-V SCSI relay test and supporting imports.
vmm_tests/Cargo.toml	Adds disk_vhd1 dependency for test VHD creation.
vmm_test_macros/src/lib.rs	Introduces hyperv_test attribute macro.
petri/src/vm/hyperv/vm.rs	Returns VSID from add_scsi_controller, adds setter for base VTL2 settings.
petri/src/vm/hyperv/powershell.rs	Updates SCSI controller addition to return VSID; adds run_set_base_vtl2_settings.
petri/src/vm/hyperv/mod.rs	Adds HyperVPetriConfig, VTL2 settings handling, public runtime APIs.
petri/src/vm/hyperv/hyperv.psm1	Adds PowerShell helpers for SCSI controller properties and setting VTL2 settings.

[github-actions]

At least one Petri test failed.

[github-actions]

At least one Petri test failed.

[chris-oo]

seems like it doesn't work because it's trying to hot-add the controller?

[mattkur]

seems like it doesn't work because it's trying to hot-add the controller?

Right. I admit I'm letting CI do my testing for me since I'm on a machine that is too small to do this efficiently; will clean this up locally.