On Tue, 29 Sep 2020 15:25:22 +0200, Ard Biesheuvel wrote:
> Jonathan reports that the strict policy for memory mapped by the
> ACPI core breaks the use case of passing ACPI table overrides via
> initramfs. This is due to the fact that the memory type used for
> loading the initramfs in memory is not recognized as a memory type
> that is typically used by firmware to pass firmware tables.
>
> Since the purpose of the strict policy is to ensure that no AML or
> other ACPI code can manipulate any memory that is used by the kernel
> to keep its internal state or the state of user tasks, we can relax
> the permission check, and allow mappings of memory that is reserved
> and marked as NOMAP via memblock, and therefore not covered by the
> linear mapping to begin with.
Applied to arm64 (for-next/fixes), thanks!
[1/1] arm64: permit ACPI core to map kernel memory used for table overrides
https://git.kernel.org/arm64/c/a509a66a9d0d
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Catalin
