Hi, Le 2021-10-26 17:33, Zameer Manji a écrit : > On Tue, Oct 26, 2021 at 5:05 PM Vincent Blut <vincent.deb...@free.fr> wrote: > > > Control: reassign -1 src:linux > > > > Hi, > > > > Le 2021-10-26 20:44, Zameer Manji a écrit : > > > Package: linux-image-arm64 > > > Version: 5.14.9-2 > > > Severity: important > > > > > > Dear Maintainer, > > > > > > In bullseye, version 5.10.70-1 has the > > CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER > > > kernel configuration set to 'y'. In bookworm it is unset which disable > > this feature. > > > > > > This kernel configuration parameter allows for the EFI stub of the > > kernel to > > > parse and use a 'initrd=' parameter to set up an initrd when booting > > from EFI. > > > Boot loaders like 'systemd-boot' or 'refind' set this parameter if > > configured > > > to pass an initrd. If the kernel configuration parameter is unset, the > > > `initrd=` paramater is ignored, and can result in an unbootable system > > because > > > the initrd has not setup the root filesystem. > > > > > > Without the kernel configuaration set, it is not possible to use > > 'systemd-boot' > > > or 'refind' on arm64 as both of these bootloaders assume the kernel will > > > handle the 'initrd=' flag and setup the initrd. > > > > > > Please consider enabling CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER on > > > arm64 so using 'systemd-boot' or 'refind' can continue to work. Until > > these > > > bootloaders have been updated to use an alternative method of passing the > > > initrd to the EFI stub, it is not possible to have a booting system. > > > > Except on X86, EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER is no longer enabled > > by > > default. Please see [1] for some details. > > > > Cheers, > > Vincent > > > > [1] > > https://gitlab.com/linux-kernel/stable/-/commit/6edcf9dc2e1aff3aa1f5a69ee420fb30dd0e968a > > > > Hello Vincent, > > I see and understand the rationale of upstream to deprecate this > functionality. > >From the commit you linked I see another commit [0] which says: > > > Loading an initrd passed via the kernel command line is deprecated: it > > is limited to files that reside in the same volume as the one the kernel > > itself was loaded from, and we have more flexible ways to achieve the > > same. So make it configurable so new architectures can decide not to > > enable it. > > I assume the 'more flexible ways' to do the same is referencing this > feature [1] > which is indeed more flexible. The problem is that the firmware/bootloader > must > support this new functionality, by populating the right EFI file with the > right GUID. > > As far as I can see on arm64 there are three EFI bootloaders: > * GRUB2 > * systemd-boot > * refind > > Both systemd-boot and refind do not yet support this new mechanism, > although I see > that systemd has some unreleased code [2] to support the new way. I have > not been > able to test GRUB2 but my understanding is that this new method is still > under active > development [3]. > > The problem is that upstream has deprecated this functionality by assuming > the only > active use was x86, but was completely possible to use it on arm64 (it > works fine for me > on bullseye). Since EFI bootloaders have not yet implemented the new way, > and still > rely on this deprecated method on all architectures, it results in > unbootable systems > on arm64. > > I would 100% think this should remain disabled on arm64 if most EFI > bootloaders > supported the new way, but unfortunately they do not. > > I hope you would consider enabling this kernel configuration for arm64 > until EFI > bootloaders catch up to the recommended way. > > > [0] > https://gitlab.com/linux-kernel/stable/-/commit/cf6b83664895a5c7e97710df282e220bd047f0f5 > [1] > https://gitlab.com/linux-kernel/stable/-/commit/ec93fc371f014a6fb483e3556061ecad4b40735c > [2] > https://github.com/systemd/systemd/commit/a6089431d52adda93eec251a3df0dffa1fe0661a#diff-76eb4030e88f340c9133388f17c65774b0f17a0a8105500978f6ce18ca1deb5a > [3] https://www.mail-archive.com/grub-devel@gnu.org/msg32272.html Salvatore, I tend to agree with Zameer. I think we should explicitly enable EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER until the support for loading initrd from a device path is widespread among bootloaders.
Cheers, Vincent
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