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After converting the Windows 10 system disk from qcow2 to LUKS format with pre-allocated space, the system fails to boot
Description of problem:
When converting a qcow2 file containing an installed Windows 10 system to LUKS format, using the --target-is-zero parameter in the conversion command prevents the LUKS image from shrinking. However, when attempting to boot the virtual machine with the converted LUKS file, VNC login shows a black screen, and the system fails to start. If the conversion is performed without the --target-is-zero parameter, the system boots up normally
Steps to reproduce:
1. create a luks image
qemu-img create -f qcow2 --object secret,data=123,id=sec0 -o preallocation=full,encrypt.format=luks,encrypt.key-secret=sec0 encry_ok.qcow2 50G
2.
qemu-img convert -t none -T none --object secret,id=sec0,data=123 -f qcow2 ./windows10.qcow2 -n -m 1 --target-image-opts driver=qcow2,encrypt.key-secret=sec0,file.filename=encry_ok.qcow2 --target-is-zero
windows10.qcow2 container windows20 system and it can be booted
3.
./qemu-system-x86_64 -accel kvm -cpu SandyBridge -object memory-backend-memfd,id=mem1,size=4G -machine memory-backend=mem1 -smp 4 -object secret,id=sec0,data=123,format=raw -drive if=none,driver=qcow2,file.filename=/sdc1/luzhipeng/encry_ok.qcow2,encrypt.key-secret=sec0,id=drive0,cache=none -device virtio-blk,drive=drive0,bootindex=1 -monitor stdio -vnc :4
4. vnc shows a black screen, and the system fails to start
5. if use convert command:
qemu-img convert -t none -T none --object secret,id=sec0,data=123 -f qcow2 ./windows10.qcow2 -n -m 1 --target-image-opts driver=qcow2,encrypt.key-secret=sec0,file.filename=encry_ok.qcow2
6. the windows10 system can start successful
Additional information:
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