forked from Minki/linux
816e76129e
Today, it is not possible for drivers to reserve EFI boot services for access after efi_free_boot_services() has been called on x86. For ARM/arm64 it can be done simply by calling memblock_reserve(). Having this ability for all three architectures is desirable for a couple of reasons, 1) It saves drivers copying data out of those regions 2) kexec reboot can now make use of things like ESRT Instead of using the standard memblock_reserve() which is insufficient to reserve the region on x86 (see efi_reserve_boot_services()), a new API is introduced in this patch; efi_mem_reserve(). efi.memmap now always represents which EFI memory regions are available. On x86 the EFI boot services regions that have not been reserved via efi_mem_reserve() will be removed from efi.memmap during efi_free_boot_services(). This has implications for kexec, since it is not possible for a newly kexec'd kernel to access the same boot services regions that the initial boot kernel had access to unless they are reserved by every kexec kernel in the chain. 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> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> |
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| .. | ||
| libstub | ||
| arm-init.c | ||
| arm-runtime.c | ||
| capsule-loader.c | ||
| capsule.c | ||
| cper.c | ||
| efi-pstore.c | ||
| efi.c | ||
| efibc.c | ||
| efivars.c | ||
| esrt.c | ||
| fake_mem.c | ||
| Kconfig | ||
| Makefile | ||
| memattr.c | ||
| memmap.c | ||
| reboot.c | ||
| runtime-map.c | ||
| runtime-wrappers.c | ||
| vars.c | ||