virt: add new isolation types and page data for loading isolated partitions

[chris-oo]

Add new isolation types and CCA shared gpa bit. Isolated partitions additionally require more than just the visibility of the page, in order to set memory attributes correctly for guest pages that were written to as part of the import process.

These changes are used in upcoming changes to launch SNP and CCA guests on KVM.

[github-actions]

⚠️ Unsafe Code Detected

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[chris-oo]

this dependency seems wrong to me, and i'm wondering if instead PageVisbility should instead be PageAcceptance/PageType, and either:
A) we keep the loader type and convert between these two enums
B) we define a virt type and just have the loader use it

And then as part of that virt type, we can implement some is_shared or is_private functions. Thoughts?

[jstarks]

We need to define a virt type here, and it should be close to what the hypervisors actually need, abstracted as little as possible. The vm_loader code can convert from the loader's model to the virt model.

[Copilot]

Pull request overview

This PR extends the VM load/start plumbing to support upcoming isolated-guest enablement (SNP and ARM CCA on KVM) by carrying richer “initial page import” metadata through the loader → core → virt backend boundary, and by expanding isolation configuration surfaces (new isolation types + CCA shared GPA bit).

Changes:

• Replace “initial accepted page visibility” lists with virt::InitialPageImport (range + visibility + acceptance + debug tag) throughout the load/start flow.
• Add new isolation types (SNP, CCA) to OpenVMM config and plumb to virt::IsolationType.
• Extend virt::PlatformInfo (aarch64) with cca_shared_gpa_bit.

Reviewed changes

Copilot reviewed 14 out of 15 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
vmm_core/vm_loader/src/lib.rs	Tracks imported page ranges with metadata and returns InitialPageImport list; converts duplicate register import panic into an error; adds unit tests.
vmm_core/vm_loader/Cargo.toml	Adds test_with_tracing for new unit tests.
vmm_core/virt/src/generic.rs	Adds PlatformInfo::cca_shared_gpa_bit, introduces InitialPageImport, and updates the initial-page-acceptance trait surface.
vmm_core/virt/Cargo.toml	Adds loader dependency to support InitialPageImport.acceptance.
vmm_core/virt_whp/src/lib.rs	Updates WHP backend initial-page acceptance implementation for new parameter type.
vmm_core/virt_mshv/src/aarch64/mod.rs	Initializes new PlatformInfo field.
vmm_core/virt_kvm/src/arch/aarch64/mod.rs	Initializes new PlatformInfo field.
vmm_core/virt_hvf/src/lib.rs	Initializes new PlatformInfo field.
vmm_core/src/partition_unit.rs	Renames/reshapes the RPC pathway to “accept initial pages” with InitialPageImport.
openvmm/openvmm_defs/src/config.rs	Adds IsolationType::{Snp,Cca} and maps to virt::IsolationType.
openvmm/openvmm_core/src/worker/vm_loaders/igvm.rs	Returns InitialPageImport from IGVM load.
openvmm/openvmm_core/src/worker/dispatch.rs	Moves isolated-partition page finalization to occur after initial register load; updates call to new API.
openvmm/openvmm_core/src/partition.rs	Updates partition abstraction to accept InitialPageImport.
openhcl/underhill_core/src/wrapped_partition.rs	Updates trait signature for initial page acceptance (unreachable path).
Cargo.lock	Updates lockfile for dependency graph changes.

[github-actions]

1 Petri tests failed (1 unstable)

[smalis-msft]

Suggested change

	range: MemoryRange::from_4k_gpn_range(start..(end + 1)),
	range: MemoryRange::from_4k_gpn_range(start..=end),