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Reproduce issue with configure --enable-qom-cast-debug ... qemu-system-x86_64 -display none -machine q35,cxl=on -device pxb-cxl,bus=pcie.0 hw/pci-bridge/pci_expander_bridge.c:54:PXB_DEV: Object 0x5570e0b1ada0 is not an instance of type pxb Aborted The type conversion results in the right state structure, but PXB_DEV is not a parent of PXB_CXL_DEV hence the error. Rather than directly cleaning up the inheritance, this is the minimal fix which will be followed by the cleanup. Fixes:154070eaf6("hw/pxb-cxl: Support passthrough HDM Decoders unless overridden") Reported-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Message-Id: <20230420142750.6950-2-Jonathan.Cameron@huawei.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Cc: qemu-stable@nongnu.org Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> (cherry picked from commit9136f661c7) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>