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efi/libstub/arm64: Switch to ordinary page allocator for kernel image

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It is no longer necessary to locate the kernel as low as possible in
physical memory, and so we can switch from efi_low_alloc() [which is
a rather nasty concoction on top of GetMemoryMap()] to a new helper
called efi_allocate_pages_aligned(), which simply rounds up the size
to account for the alignment, and frees the misaligned pages again.

So considering that the kernel can live anywhere in the physical
address space, as long as its alignment requirements are met, let's
switch to efi_allocate_pages_aligned() to allocate the pages.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2020-03-31 10:59:39 +02:00
parent 43b1df0e01
commit e71356fe29
1 changed files with 2 additions and 2 deletions
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4
drivers/firmware/efi/libstub/arm64-stub.c
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@ -98,8 +98,8 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
return EFI_SUCCESS;
}
status = efi_low_alloc(*reserve_size,
min_kimg_align, reserve_addr);
status = efi_allocate_pages_aligned(*reserve_size, reserve_addr,
ULONG_MAX, min_kimg_align);
if (status != EFI_SUCCESS) {
pr_efi_err("Failed to relocate kernel\n");