[AI Generated] BugFix: default raw VHD image source to x64 architecture

[rabdulfaizy]

Summary

Default VhdSchema.architecture to x64 when not explicitly set, so LISA's Architecture feature produces an x64-only requirement for raw VHD image sources. Without this default, Architecture.create_image_requirement() returns None for VHDs, allowing ARM64 SKUs (e.g. Standard_D2pds_v6) to be picked for x64-only VHD blobs and causing deployment failures such as:

Cannot create a VM of size 'Standard_D2pds_v6' ... only supports a CPU Architecture of 'Arm64'

Azure does not deploy raw VHD blobs to ARM64 VMs, so x64 is the safe and correct default. Users with ARM64 VHDs can still override via vhd.architecture: Arm64 in their runbook.

Change

3 lines added to VhdSchema.load_from_platform() in lisa/sut_orchestrator/azure/common.py:

# Azure does not deploy raw VHD blobs to ARM64 VMs; default to x64.
if self.architecture is None:
    self.architecture = schema.ArchitectureType.x64

Validation

• Offline unit checks (3/3 pass): default → x64; explicit Arm64 preserved; CVM path also defaults to x64.
• Live LISA smoke test on a real Ubuntu Noble x64 raw VHD in westus2, hyperv_generation=2:
  • Pre-fix behavior: LISA selected Standard_D2pds_v6 (Arm64) → deployment fails with architecture mismatch.
  • Post-fix behavior: LISA selected Standard_D2ads_v5 (x64) → deployed in 94s, smoke_test PASSED in 86s.
• pylint: 10/10 on changed lines.

Closes-ADO-Bug: 62695399

[Copilot]

Pull request overview

This PR fixes Azure raw VHD deployments selecting ARM64-only SKUs by defaulting VhdSchema.architecture to x64 when it’s not explicitly set, ensuring the Azure Architecture feature generates an x64-only requirement for VHD image sources.

Changes:

• Default VhdSchema.architecture to schema.ArchitectureType.x64 when unset in load_from_platform().
• Preserve user override behavior when architecture is explicitly provided in the runbook.

[github-actions]

✅ AI Test Selection — PASSED

1 test case(s) selected (view run)

Marketplace image: canonical 0001-com-ubuntu-server-jammy 22_04-lts-arm64 latest

	Count
✅ Passed	1
❌ Failed	0
⏭️ Skipped	0
Total	1

Test case details

Test Case	Status	Time (s)	Message
smoke_test (lisa_0_0)	✅ PASSED	32.745

[rabdulfaizy]

Closing as duplicate - the bug was independently fixed by another contributor. No change needed here.