Add support for persistent memory reservations across kexec reboot on EFI systems by introducing a Linux-specific UEFI configuration table that points to a linked list in memory that can be augmented by each successive kexec kernel to describe regions in memory that the subsequent kernel should treat as reserved.
The specific use case for this feature is GICv3 ARM systems that are not able to disable DMA access to LPI tables, meaning we have to reserve them and make the next kernel reuse the existing tables rather than allocating them from scratch. Cc: Jeremy Linton <[email protected]> Cc: Marc Zyngier <[email protected]> Ard Biesheuvel (3): efi: honour memory reservations passed via a linux specific config table efi/arm: libstub: add a root memreserve config table efi: add API to reserve memory persistently across kexec reboot drivers/firmware/efi/efi.c | 59 +++++++++++++++++++- drivers/firmware/efi/libstub/arm-stub.c | 27 +++++++++ include/linux/efi.h | 9 +++ 3 files changed, 94 insertions(+), 1 deletion(-) -- 2.17.1
