[Bug]: VirtualBox 7.2.22 Windows host: 2-vCPU UEFI boot stalls before DVD prompt (NEM / CpuMpPei)

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Maintainer thường phản hồi trong vòng 6 ngày

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3-5 ngày
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operating-systems

Hướng nghiên cứu

Start by reviewing the attached reproduction and redacted firmware/NEM excerpts, especially the baseline and x2APIC logs around DXE_AP and CpuMpPei.efi. Then investigate the EFI boot path for the two-vCPU configurations and compare it with the one-vCPU diagnostic control. Done means explaining the stall and identifying a supported remedy that reaches the DVD prompt with two vCPUs, or documenting why none is available.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.

Mô tả

bug
Version

7.2.22

Host OS Type

Windows

Host OS name + version

Windows 11 Home 64-bit, build 26200.9818

Host Architecture

x86

Guest OS Type

Windows

Guest Architecture

x86

Guest OS name + version

Windows 11 Enterprise Evaluation 26H2 x64 installation media; Windows Setup has not been reached

Component

EFI

What happened?

Hello VirtualBox maintainers,

We are reporting a reproducible firmware-stage issue with VirtualBox 7.2.22r175245 on a Windows 11 64-bit host (build 26200.9818).

Observed behavior:

  • With 1 vCPU, firmware reaches cdboot.efi and displays the DVD boot prompt. This is only a diagnostic control, not a proposed Windows 11 configuration.
  • With the baseline 2-vCPU configuration, the framebuffer remains 0x0 and firmware stops after DXE_AP.
  • With 2 vCPUs and both CPU and firmware x2APIC enabled, the VM starts but framebuffer remains 0x0. The relevant firmware log ends after CpuMpPei.efi at 00:00:07.714980; no cdboot.efi or DVD prompt appears.

The host reports hardware virtualization and nested paging support. NEM reports 'Snail execution mode is active'. Could you advise whether this is a known issue or whether there is a supported configuration or release-level remedy that preserves Windows 11 requirements and host protections?

The attached diagnostic archive contains four intentionally redacted text files: the report, reproduction and firmware/NEM excerpts. It contains no VM disk, ISO, full VBox.log, VM identifier, MAC address, host name, user name, network address or credentials. Full logs are intentionally withheld for privacy; please let us know if a specific additional redacted excerpt is needed. This is not a crash report.

Archive SHA-256: 17ED20936998BCE3F6496BCF6F8F9A7CEBD12CC372DCE1E100629F48A5CDBCD3 (4,182 bytes).

AI-Centrum-VirtualBox-REPRO-PUBLIC-PROPOSAL-20261031.zip

How can we reproduce this?

Host: 4 physical cores / 8 logical processors, 16 GB RAM; hardware virtualization, long mode and nested paging supported. Extension Pack is not installed.

  1. Start with a powered-off test VM: 4 GB RAM, 2 vCPUs, EFI, Secure Boot, TPM 2.0, SATA DVD with official Windows 11 Enterprise Evaluation x64 ISO. Disconnect NIC1 (none). No shared folders, clipboard, USB or VRDE; do not send guest keyboard input.
  2. Baseline branch: APIC on, CPU x2APIC off, firmware APIC apic. Start the VM and observe firmware only. Framebuffer remains 0x0; log reaches DXE_AP after CpuDxe.efi / PciHostBridgeDxe.efi.
  3. x2APIC branch: 2 vCPUs, APIC on, CPU x2APIC on, firmware APIC x2apic, NIC still disconnected. Start headless. Framebuffer remains 0x0; log ends at CpuMpPei.efi (00:00:07.714980). No cdboot.efi or DVD prompt.
  4. Diagnostic control only: with 1 vCPU the same media reaches cdboot.efi and the DVD prompt (1024x768). No boot key was sent and no license or Windows Setup accepted.

Expected: a framebuffer and the DVD boot prompt with the required 2 vCPUs.
Actual: no framebuffer / prompt in either 2-vCPU branch.

After each test the VM is powered off and restored to the baseline. Host Hyper-V/VBS, Defender, Secure Boot and TPM protections have not been disabled. Redacted firmware timestamps are in the attached archive.

Did you upload all of your necessary log files, screenshots, etc.?
  • Yes, I've uploaded all pertinent files to this issue.
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