Eep! efi=no_disable_early_pci_dma only does anything if CONFIG_EFI_DISABLE_PCI_DMA is set, and distros should not be setting that by default (it's a thing that

Eep! efi=no_disable_early_pci_dma only does anything if CONFIG_EFI_DISABLE_PCI_DMA is set, and distros should not be setting that by default (it's a thing that works Just Fine in theory, and specific implementations may fail hard with it - eg, if ExitBootServices() triggers a callback that assumes that a PCI device is able to DMA, things may explode). It's a useful security feature (I mean, I wrote it, I would say that) but it can break even if implementations follow the spec perfectly.