On Fri, 07 Aug, at 09:37:00AM, Matt Fleming wrote:

From: "Jonathan (Zhixiong) Zhang" <redacted>

Table 8 of UEFI 2.5 section 2.3.6.1 defines mappings from EFI
memory types to MAIR attribute encodings for arm64.

If the physical address has memory attributes defined by EFI
memmap as EFI_MEMORY_[UC|WC|WT], return approprate page protection
type according to the UEFI spec. Otherwise, return PAGE_KERNEL.

Reviewed-by: Catalin Marinas <redacted>
Acked-by: Hanjun Guo <redacted>
Signed-off-by: Jonathan (Zhixiong) Zhang <redacted>
Signed-off-by: Matt Fleming <redacted>
---
 arch/arm64/include/asm/acpi.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

Ard Biesheuvel has brought up a concern with this patch and it's
currently under discussion here,

  https://lkml.kernel.org/r/CAKv+Gu8+g3dTaNzXjSD=5GxproaHM+Eu1hLmRWp7cVrQimzbHQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org

-- 
Matt Fleming, Intel Open Source Technology Center