Add power management device support to chipset resources

[moor-coding]

• Add HyperVPowerManagementDeviceHandle and Piix4PowerManagementDeviceHandle with PmTimerAssistHandleKind for platform-resolved PM timer assist
• Add HyperVPowerManagementResolver and Piix4PowerManagementResolver
• PIIX4 PM uses LegacyPciChipsetDeviceHandle with explicit bus name and BDF
• Underhill registers UnderhillPmTimerAssistResolver for PlatformResource, activated via VmManifestBuilder::with_platform_pm_timer_assist()

[Copilot]

Pull request overview

This PR moves x86 power management devices (Hyper-V PM and PIIX4 PM) onto the resource-resolution path, and adds an optional “platform PM timer assist” resource hook (used by Underhill) instead of wiring PM timer assist directly through BaseChipsetDevices deps.

Changes:

• Add chipset_resources::pm handles/kinds for Hyper-V / PIIX4 PM devices plus a PmTimerAssistHandleKind that can resolve from PlatformResource.
• Introduce async resource resolvers for Hyper-V PM (chipset::pm) and PIIX4 PM (chipset_legacy::piix4_pm) and register them in the OpenVMM resolver registries.
• Extend VmManifestBuilder with with_platform_pm_timer_assist() and plumb it through Underhill via a new UnderhillPmTimerAssistResolver.

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
vmm_core/vmotherboard/src/base_chipset.rs	Removes direct PM device construction and PM deps from the base chipset builder path.
vmm_core/vm_manifest_builder/src/lib.rs	Adds with_platform_pm_timer_assist() and attaches PM device handles (Hyper-V / PIIX4) with optional platform PM timer assist resource.
vm/devices/chipset_resources/src/lib.rs	Adds pm resource module: PM device handles, PM timer assist kind/trait, and default constants.
vm/devices/chipset_legacy/src/piix4_pm/resolver.rs	New async resolver to materialize the PIIX4 PM device from its resource handle.
vm/devices/chipset_legacy/src/piix4_pm/mod.rs	Exposes the new PIIX4 PM resolver module.
vm/devices/chipset_legacy/Cargo.toml	Adds dependencies needed by the new PIIX4 PM resolver.
vm/devices/chipset/src/pm/resolver.rs	New async resolver to materialize the Hyper-V PM device from its resource handle.
vm/devices/chipset/src/pm/mod.rs	Re-exports PmTimerAssist from chipset_resources and exposes the new resolver module.
openvmm/openvmm_resources/src/lib.rs	Registers the new PM resolvers for x86_64 guests.
openvmm/openvmm_core/src/worker/dispatch.rs	Removes old PM deps wiring into BaseChipsetDevices.
openhcl/underhill_core/src/worker.rs	Enables with_platform_pm_timer_assist() and adds UnderhillPmTimerAssistResolver for the platform PM timer assist resource.
openhcl/underhill_core/Cargo.toml	Adds chipset_resources dependency for Underhill’s PM timer assist resolver output types.
openhcl/openvmm_hcl_resources/src/lib.rs	Registers the new PM resolvers for x86_64 guests in the HCL resolver registry.
Cargo.lock	Updates lockfile for new/updated dependencies.

[github-actions]

4 Petri tests failed (0 unstable)

[Copilot]

Pull request overview

Copilot reviewed 13 out of 14 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 13 out of 14 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 13 out of 14 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

vm/devices/chipset/src/pm/mod.rs:371

• pm module has #![warn(missing_docs)], but the new pub use chipset_resources::pm::PmTimerAssist; re-export is missing a rustdoc comment (currently a regular // comment). This will trigger missing_docs (and likely fail CI with -Dwarnings). Convert the comment to a /// doc comment (or add #[expect(missing_docs)] on the re-export if intentionally undocumented).