From 199c8471761273b7e287914cee968ddf21dfbfe0 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 6 Nov 2019 17:43:26 -0800 Subject: x86/efi: Add efi_fake_mem support for EFI_MEMORY_SP Given that EFI_MEMORY_SP is platform BIOS policy decision for marking memory ranges as "reserved for a specific purpose" there will inevitably be scenarios where the BIOS omits the attribute in situations where it is desired. Unlike other attributes if the OS wants to reserve this memory from the kernel the reservation needs to happen early in init. So early, in fact, that it needs to happen before e820__memblock_setup() which is a pre-requisite for efi_fake_memmap() that wants to allocate memory for the updated table. Introduce an x86 specific efi_fake_memmap_early() that can search for attempts to set EFI_MEMORY_SP via efi_fake_mem and update the e820 table accordingly. The KASLR code that scans the command line looking for user-directed memory reservations also needs to be updated to consider "efi_fake_mem=nn@ss:0x40000" requests. Acked-by: Ard Biesheuvel Reviewed-by: Dave Hansen Signed-off-by: Dan Williams Acked-by: Thomas Gleixner Signed-off-by: Rafael J. Wysocki --- drivers/firmware/efi/fake_mem.h | 10 ++++++++++ 1 file changed, 10 insertions(+) create mode 100644 drivers/firmware/efi/fake_mem.h (limited to 'drivers/firmware/efi/fake_mem.h') diff --git a/drivers/firmware/efi/fake_mem.h b/drivers/firmware/efi/fake_mem.h new file mode 100644 index 000000000000..d52791af4b18 --- /dev/null +++ b/drivers/firmware/efi/fake_mem.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __EFI_FAKE_MEM_H__ +#define __EFI_FAKE_MEM_H__ +#include + +#define EFI_MAX_FAKEMEM CONFIG_EFI_MAX_FAKE_MEM + +extern struct efi_mem_range efi_fake_mems[EFI_MAX_FAKEMEM]; +extern int nr_fake_mem; +#endif /* __EFI_FAKE_MEM_H__ */ -- cgit v1.2.3