On Mon, 31 May 2021 at 11:57, Marc Zyngier <maz@xxxxxxxxxx> wrote: > > This series is a complete departure from the approach I initially sent > almost a month ago[0]. Instead of trying to teach EFI, ACPI and other > subsystem to use memblock, I've decided to stick with the iomem > resource tree and use that exclusively for arm64. > > This means that my current approach is (despite what I initially > replied to both Dave and Catalin) to provide an arm64-specific > implementation of arch_kexec_locate_mem_hole() which walks the > resource tree and excludes ranges of RAM that have been registered for > any odd purpose. This is exactly what the userspace implementation > does, and I don't really see a good reason to diverge from it. > > Again, this allows my Synquacer board to reliably use kexec_file_load > with as little as 256M, something that would always fail before as it > would overwrite most of the reserved tables. > > Although this series still targets 5.14, the initial patch is a > -stable candidate, and disables non-kdump uses of kexec_file_load. I > have limited it to 5.10, as earlier kernels will require a different, > probably more invasive approach. > > Catalin, Ard: although this series has changed a bit compared to v1, > I've kept your AB/RB tags. Should anything seem odd, please let me > know and I'll drop them. > Fine with me. > Thanks, > > M. > > * From v1 [1]: > - Move the overlap exclusion into find_next_iomem_res() > - Handle child resource not overlapping with parent > - Provide walk_system_ram_excluding_child_res() as a top level > walker > - Simplify arch-specific code > - Add initial patch disabling non-crash kernels > > [0] https://lore.kernel.org/r/20210429133533.1750721-1-maz@xxxxxxxxxx > [1] https://lore.kernel.org/r/20210526190531.62751-1-maz@xxxxxxxxxx > > Marc Zyngier (5): > arm64: kexec_file: Forbid non-crash kernels > kexec_file: Make locate_mem_hole_callback global > kernel/resource: Allow find_next_iomem_res() to exclude overlapping > child resources > kernel/resource: Introduce walk_system_ram_excluding_child_res() > arm64: kexec_image: Restore full kexec functionnality > > arch/arm64/kernel/kexec_image.c | 39 ++++++++++++++++ > include/linux/ioport.h | 3 ++ > include/linux/kexec.h | 1 + > kernel/kexec_file.c | 6 +-- > kernel/resource.c | 82 +++++++++++++++++++++++++++++---- > 5 files changed, 119 insertions(+), 12 deletions(-) > > -- > 2.30.2 > _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
