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AArch64 Hyper-V OpenHCL: failed VTL2 protections #3253

@dongle-the-gadget

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@dongle-the-gadget

Host: Windows 11 Pro 26300.8170 (AArch64)
OpenVMM commit: a6d9ddc

OpenHCL on my machine fails to apply VTL2 protections, causing booting to fail. Error message logged from Hyper-V-Worker-Operational logs:

[Virtual machine 68BF2A96-887B-43CF-8AB3-B1AFB4772B4E] {"timestamp":"0.108668749s","level":"ERROR","target":"underhill_core::worker","related_activity_id":"058e7e53-0000-0039-0100-000040000000","fields":{"message":"failed to start VM","error":["failed to initialize memory","failed to apply vtl2 protections for 0x8000000-0xb000000","hypervisor failed with HypercallOutput { call_status: AccessDenied, rsvd: 0, elements_processed: 12, rsvd2: 0 } when protecting pages 0x8bf4000-0x8df2000 for vtl HvInputVtl { target_vtl_value: 0, use_target_vtl: false, reserved: 0 }","Access denied"]}}

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