On Tue Sep 12, 2023 at 9:56 PM EEST, Jan Hendrik Farr wrote: > > What sort of bottleneck does the EFI stub have so that we need yet > > another envelope? > > Well I can come up with a few advantages of UKI compared to normal bzImage with builtin initrd and cmdline. > > 1. You already identified this one. Using addons to adjust your cmdline It is not a benefit as this is already possible today. > 2. I can use my normal initramfs generation tooling. Just install my > compiled kernel, my distros install script will generate the > initramfs. Then I package it up as a UKI. This will be a lot more > awkward with a builtin initrd. > 3. Measured boot. You can place PCR signatures in the UKI using > systemd-measure. This will sign the expected PCR values for booting > this UKI. I think with normal bzImage this will be a lot more > difficult. If you place those PCR signatures in the builtin initrd > this will change the kernel image which means now the values you > signed no longer match (depending on how you measure the kernel; I > don't think the normal EFI stub even measures the kernel in first > place, but I could be mistaken about this) > 4. UKIs are automatically recognized by systemd-boot These are sort of "tautological" arguments. There must be some objective reasons why this architecture was chosen instead of other (i.e. using what already pre-exists). BR, Jarkko _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
