qemu-7.0 there is no device "hostdev0" defined

Operating system: gentoo
OS/kernel version: 5.17.5
Architecture: x86_64
QEMU flavor: qemu-system-x86_64
QEMU version: 7.0.0
QEMU command line: libvirt qemu-system-x86_64: -set device.hostdev0.x-vga=on: there is no device "hostdev0" defined qemu-6.2 can use this method text,but 7.0 it does't work

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