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x86/efi-bgrt: Use efi_mem_reserve() to avoid copying image data 

efi_mem_reserve() allows us to permanently mark EFI boot services
regions as reserved, which means we no longer need to copy the image
data out and into a separate buffer.

Leaving the data in the original boot services region has the added
benefit that BGRT images can now be passed across kexec reboot.

Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Tested-by: Dave Young <dyoung@redhat.com> [kexec/kdump]
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> [arm]
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Peter Jones <pjones@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Josh Boyer <jwboyer@fedoraproject.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Môshe van der Sterre <me@moshe.nl>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
This commit is contained in:
Matt Fleming 2016-06-23 11:36:32 +01:00
parent 8e80632fb2
commit 4bc9f92e64
1 changed files with 2 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/x86/platform/efi/efi-bgrt.c
View File

@ -82,21 +82,12 @@ void __init efi_bgrt_init(void)
}
bgrt_image_size = bmp_header.size;
bgrt_image = kmalloc(bgrt_image_size, GFP_KERNEL | __GFP_NOWARN);
bgrt_image = memremap(bgrt_tab->image_address, bmp_header.size, MEMREMAP_WB);
if (!bgrt_image) {
pr_notice("Ignoring BGRT: failed to allocate memory for image (wanted %zu bytes)\n",
bgrt_image_size);
return;
}
image = memremap(bgrt_tab->image_address, bmp_header.size, MEMREMAP_WB);
if (!image) {
pr_notice("Ignoring BGRT: failed to map image memory\n");
kfree(bgrt_image);
bgrt_image = NULL;
return;
}
memcpy(bgrt_image, image, bgrt_image_size);
memunmap(image);
efi_mem_reserve(bgrt_tab->image_address, bgrt_image_size);
}