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efi_loader: fix AllocatePages overlap status

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Return EFI_NOT_FOUND for EFI_ALLOCATE_ADDRESS overlap

When efi_allocate_pages() is called with EFI_ALLOCATE_ADDRESS, UEFI
expects EFI_NOT_FOUND if the requested address range is already
allocated or unavailable. U-Boot currently returns
EFI_OUT_OF_RESOURCES when efi_update_memory_map() detects an overlap
after a successful lmb_alloc_mem(), which does not match
EFI_ALLOCATE_ADDRESS semantics.

Return EFI_NOT_FOUND for EFI_ALLOCATE_ADDRESS requests that fail due
to an overlapping EFI memory descriptor, while keeping
EFI_OUT_OF_RESOURCES for other allocation types.

The UEFI specification [1] specifies that
EFI_BOOT_SERVICES.AllocatePages must return EFI_NOT_FOUND when the
requested address range is unavailable or already allocated;
EFI_OUT_OF_RESOURCES applies to non‑address‑specific allocation
failures.

[1] https://uefi.org/specs/UEFI/2.10_A/07_Services_Boot_Services.html

Signed-off-by: Harsimran Singh Tungal <harsimransingh.tungal@arm.com>

The UEFI specification does not clearly specify the behavior.
But let's follow the EDK II precedent here.

Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Harsimran Singh Tungal
2026-04-27 16:05:30 +01:00
committed by Heinrich Schuchardt
parent 215496fec5
commit d0d1c4a4f5
1 changed files with 3 additions and 1 deletions
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2
lib/efi_loader/efi_memory.c
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@@ -495,6 +495,8 @@ efi_status_t efi_allocate_pages(enum efi_allocate_type type,
/* Map would overlap, bail out */
lmb_free(addr, (u64)pages << EFI_PAGE_SHIFT, flags);
unmap_sysmem((void *)(uintptr_t)efi_addr);
if (type == EFI_ALLOCATE_ADDRESS)
return EFI_NOT_FOUND;
return EFI_OUT_OF_RESOURCES;
}