Since the VFIO module is included in the kernel from kernel 5.4.26, it is necessary to specify it with the kernel parameter of grub.
/ etc / default / grub
GRUB_CMDLINE_LINUX = “amd_iommu = on iommu = pt pcie_aspm = off vfio_iommu_type1.allow_unsafe_interrupts = 1 vfio_pci.disable_vga = 1 vfio_pci.disable_idle_d3 = 1”