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[v2,0/2] efi: Fixes for EFI_MEMORY_SP memory on RISC-V and ARM64

Message ID 20240202180704.808766-1-abrestic@rivosinc.com
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Series efi: Fixes for EFI_MEMORY_SP memory on RISC-V and ARM64 | expand

Message

Andrew Bresticker Feb. 2, 2024, 6:07 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 soft-reserved 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/

v1->v2: address comments from Ard

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

 drivers/firmware/efi/arm-runtime.c   |  2 +-
 drivers/firmware/efi/efi-init.c      | 19 ++++++++++---------
 drivers/firmware/efi/riscv-runtime.c |  2 +-
 3 files changed, 12 insertions(+), 11 deletions(-)

Comments

Ard Biesheuvel Feb. 2, 2024, 6:28 p.m. UTC | #1 
On Fri, 2 Feb 2024 at 19:07, Andrew Bresticker <abrestic@rivosinc.com> wrote:
>
> 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 soft-reserved 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/
>
> v1->v2: address comments from Ard
>
> Andrew Bresticker (2):
>   efi: runtime: Fix potential overflow of soft-reserved region size
>   efi: Don't add memblocks for soft-reserved memory
>

Thanks, I'll take these both as fixes.