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[0/2] efi: Fixes for EFI_MEMORY_SP memory on RISC-V and ARM64

Message ID 20240202163433.786581-1-abrestic@rivosinc.com (mailing list archive)
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Series efi: Fixes for EFI_MEMORY_SP memory on RISC-V and ARM64 | expand

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Andrew Bresticker Feb. 2, 2024, 4:34 p.m. UTC 
Two small fixes to enable the use soft-reserved/special-purpose memory
(EFI_MEMORY_SP) with dax_kmem on RISC-V (and ARM64, I think, though I
don't have a platform to test it on).

Patch 1 fixes a trivial integer narrowing bug. Patch 2 prevents adding
memblocks for unusable memory (including soft-resreved memory) so that it
can later be hotplugged by dax_kmem.

Tested on a RISC-V platform that presents a range of EFI_MEMORY_SP with
Bjorn's MEMORY_HOTPLUG series[0] applied.

[0]: https://lore.kernel.org/lkml/20230512145737.985671-1-bjorn@kernel.org/

Andrew Bresticker (2):
  efi: runtime: Fix potential overflow of soft-reserved region size
  efi: Don't add memblocks for unusable memory

 drivers/firmware/efi/arm-runtime.c   |  2 +-
 drivers/firmware/efi/efi-init.c      | 12 +-----------
 drivers/firmware/efi/riscv-runtime.c |  2 +-
 3 files changed, 3 insertions(+), 13 deletions(-)