sudo apt install swtpm # Then add TPM via VM settings -> Add Hardware -> TPM -> Device type: TIS, Model: TPM 2.0 Solution: Windows Update sometimes overwrites the VirtIO network driver. Always keep a copy of the latest virtio-win.iso mounted. If network disappears, re-run the driver installer from the ISO. Problem: QCOW2 keeps growing to full size Solution: Enable automatic shrinking. Inside the VM, run:
Virtualization has become the backbone of modern IT workflows, and for Linux users running QEMU/KVM, the (QEMU Copy-On-Write version 2) format is the gold standard for virtual disk images. Running Windows 11 as a guest on a Linux host offers unparalleled performance—but only if you have the right image and, crucially, a strategy to keep it updated.
defrag C: /U /V Then from the host:
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qemu-img map windows11.qcow2 --output=json # Check used space qemu-img convert -O qcow2 windows11.qcow2 windows11_shrinked.qcow2 Bookmark this section. All the commands you need to maintain the best Windows 11 QCOW2 setup:
optimize-volume -DriveLetter C -ReTrim -Verbose Problem: "This PC can't run Windows 11" (TPM 2.0 error) Solution: In Virt-Manager, add a Virtual TPM device (swtpm package required). Windows 11 mandates TPM 2.0. sudo apt install swtpm # Then add TPM
, run the following in an elevated PowerShell to enable TRIM for the QCOW2 disk: