Windows Longhorn Qcow2 Work -

WL-QCOW2-2024-01 Date: October 26, 2023 (Retrospective Analysis) Author: Virtualization Archaeology & Testing Lab Subject: Functional integrity, performance, and deployment of Windows Longhorn builds via QEMU/QCow2.

For those looking to test specific builds, the following repositories provide the necessary ISOs to convert into QCOW2: windows longhorn qcow2 work

| Flag | Why it's required | | :--- | :--- | | if=ide | Forces IDE emulation. Longhorn lacks native SATA drivers. | | -cpu ... -hypervisor | Removes KVM leaf signatures. Longhorn checks if it's virtualized and intentionally breaks some UI components (sidebar crashes). | | smp cores=1 | Longhorn's SMP kernel is unstable. Single-core emulation prevents kernel panics. | | -machine pc-q35-6.2 | Provides a mature chipset. Avoid pc-i440fx-* due to PCI IRQ routing bugs in Longhorn. | | -no-hpet | Disables High Precision Event Timer. Longhorn's HAL misinterprets HPET and causes 100% CPU idle loops. | | -vga std | The standard VGA allows the "Longhorn 4074 SVGA hack" later. Do not use virtio-vga . | | | -cpu

Several tools are available to help you work with QCOW2 images: | | smp cores=1 | Longhorn's SMP kernel is unstable

qemu-system-i386 -hda longhorn.qcow2 -cdrom longhorn_iso.iso -boot d \ -m 1G -vga cirrus -usbdevice tablet \ -rtc base="2003-10-20",clock=vm Use code with caution. Copied to clipboard ⚠️ Common Hurdles & Fixes