Add SerialConsole support for OpenVMM guests

[vyadavmsft]

Kdump and reboot diagnostics call node.features[SerialConsole].check_panic() to inspect the guest serial log. OpenVMM guests already launch with COM1 wired to an OpenVMM-managed log path, but the OpenVMM controller only advertised StartStop, so tests that require SerialConsole failed during feature lookup with 'feature [SerialConsole] isn't supported on platform [openvmm]'.

Add an OpenVMM SerialConsole feature that reads the guest console from the parent host, because the COM1 file is host-side state rather than a file inside the guest. The implementation reads the configured file serial log by default, falls back to the launcher stderr log when the runbook uses serial.mode=stderr, and strips ANSI control sequences before the common panic scanner processes the content.

Register SerialConsole in OpenVMM supported_features and add selftests for feature registration, file-backed console collection, stderr-backed console collection, and ANSI cleanup.

Description

Related Issue

Type of Change

• Bug fix
• New feature
• Breaking change
• Refactoring
• Documentation update

Checklist

• Description is filled in above
• No credentials, secrets, or internal details are included
• Peer review requested (if not, add required peer reviewers after raising PR)
• Tests executed and results posted below

Test Validation

Key Test Cases:

Impacted LISA Features:

Tested Azure Marketplace Images:

Test Results

2026-05-11 18:56:39.624[140297817466688][INFO] lisa.RootRunner ________________________________________
2026-05-11 18:56:39.624[140297817466688][INFO] lisa.RootRunner OpenVmmPlatformSuite.verify_openvmm_guest_boot: PASSED
2026-05-11 18:56:39.624[140297817466688][INFO] lisa.RootRunner OpenVmmPlatformSuite.verify_openvmm_restart_via_platform: PASSED
2026-05-11 18:56:39.625[140297817466688][INFO] lisa.RootRunner CPU.verify_cpu_count: PASSED
2026-05-11 18:56:39.625[140297817466688][INFO] lisa.RootRunner KdumpCrash.verify_kdumpcrash_on_random_cpu: PASSED

[ghost]

✅ AI Test Selection — PASSED

4 test case(s) selected (view run)

Marketplace image: canonical 0001-com-ubuntu-server-jammy 22_04-lts-gen2 latest

	Count
✅ Passed	2
❌ Failed	0
⏭️ Skipped	2
Total	4

Test case details

Test Case	Status	Time (s)	Message
verify_openvmm_restart_via_platform (lisa_0_2)	⏭️ SKIPPED	5.365	before_case skipped: This suite only applies to OpenVMM guest nodes. Actual node type: RemoteNode.
verify_openvmm_stop_start_in_platform (lisa_0_3)	⏭️ SKIPPED	5.960	before_case skipped: This suite only applies to OpenVMM guest nodes. Actual node type: RemoteNode.
verify_reboot_in_platform (lisa_0_0)	✅ PASSED	48.128
verify_stop_start_in_platform (lisa_0_1)	✅ PASSED	86.590

[Copilot]

Pull request overview

This PR adds OpenVMM support for the common SerialConsole feature so diagnostics like panic checks can read guest serial logs from the OpenVMM host.

Changes:

• Adds an OpenVMM SerialConsole implementation that reads file-backed or stderr-backed host logs.
• Registers SerialConsole in OpenVMM supported features.
• Adds selftests for feature registration and console log collection paths.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
lisa/sut_orchestrator/openvmm/serial_console.py	Implements host-side serial console log retrieval for OpenVMM guests.
lisa/sut_orchestrator/openvmm/node.py	Registers OpenVMM SerialConsole support.
selftests/test_openvmm_node.py	Adds selftests for OpenVMM serial console behavior.

[vyadavmsft]

@copilot apply changes based on the comments in this thread

and fix check errors

[Copilot]

@copilot apply changes based on the comments in this thread

and fix check errors

Implemented the requested updates from the review thread and fixed the failing checks in commit 3b6b26f.

• OpenVMM SerialConsole now reads host-side console logs with sudo (handles TAP/root-owned log files).
• Updated related selftests for sudo-based log reads.
• Fixed branch check failures by restoring ensure_minimum_raw_disk_size and aligning SSH forwarding assertions with current command behavior.
• Verified with python -m unittest discover (222 tests, passing).

[ghost]

✅ AI Test Selection — PASSED

3 test case(s) selected (view run)

Marketplace image: canonical 0001-com-ubuntu-server-jammy 22_04-lts-gen2 latest

	Count
✅ Passed	1
❌ Failed	0
⏭️ Skipped	2
Total	3

Test case details

Test Case	Status	Time (s)	Message
verify_openvmm_stop_start_in_platform (lisa_0_2)	⏭️ SKIPPED	5.490	before_case skipped: This suite only applies to OpenVMM guest nodes. Actual node type: RemoteNode.
verify_openvmm_restart_via_platform (lisa_0_1)	⏭️ SKIPPED	5.845	before_case skipped: This suite only applies to OpenVMM guest nodes. Actual node type: RemoteNode.
verify_stop_start_in_platform (lisa_0_0)	✅ PASSED	83.854

[LiliDeng]

@anirudhrb @pupacha please review, @vyadavmsft please paste results in description, thanks!

[vyadavmsft]

@copilot fix check error .

[Copilot]

@copilot fix check error .

Fixed the check error in commit f65866e. Root cause was flake8-black (BLK100) on lisa/sut_orchestrator/openvmm/node.py; I applied black-compliant formatting only and revalidated with targeted tests plus final validation.

[ghost]

✅ AI Test Selection — PASSED

4 test case(s) selected (view run)

Marketplace image: canonical 0001-com-ubuntu-server-jammy 22_04-lts-gen2 latest

	Count
✅ Passed	3
❌ Failed	0
⏭️ Skipped	1
Total	4

Test case details

Test Case	Status	Time (s)	Message
verify_openvmm_stop_start_in_platform (lisa_0_3)	⏭️ SKIPPED	5.489	before_case skipped: This suite only applies to OpenVMM guest nodes. Actual node type: RemoteNode.
verify_stop_start_in_platform (lisa_0_0)	✅ PASSED	103.662
verify_vm_resize_decrease (lisa_0_2)	✅ PASSED	301.930
verify_vm_resize_increase (lisa_0_1)	✅ PASSED	309.489