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When I installed pve6.0, I chose the disk ext4 mode, and then I can add a pci device after the following processing!
nano / etc / default / grub
GRUB_CMDLINE_LINUX_DEFAULT = "quiet"
to
GRUB_CMDLINE_LINUX_DEFAULT = "quiet intel_iommu = on"
update-grub
nano / etc / modules
vfio...