device: 0.877 graphic: 0.860 files: 0.832 network: 0.814 vnc: 0.739 performance: 0.733 socket: 0.687 other: 0.667 semantic: 0.467 boot: 0.421 PID: 0.401 debug: 0.365 KVM: 0.335 permissions: 0.333 hw/pci-host/designware.c incorrect write to DESIGNWARE_PCIE_ATU_UPPER_TARGET register Description of problem: I think this is a obvious bug https://gitlab.com/qemu-project/qemu/-/blob/master/hw/pci-host/designware.c?ref_type=heads#L374 Write to register DESIGNWARE_PCIE_ATU_UPPER_TARGET, val should be shifted left to update upper 32 bit part.