James Morse 50d7ba36b9 arm64: export memblock_reserve()d regions via /proc/iomem ... There has been some confusion around what is necessary to prevent kexec overwriting important memory regions. memblock: reserve, or nomap? Only memblock nomap regions are reported via /proc/iomem, kexec's user-space doesn't know about memblock_reserve()d regions. Until commit f56ab9a5b7 ("efi/arm: Don't mark ACPI reclaim memory as MEMBLOCK_NOMAP") the ACPI tables were nomap, now they are reserved and thus possible for kexec to overwrite with the new kernel or initrd. But this was always broken, as the UEFI memory map is also reserved and not marked as nomap. Exporting both nomap and reserved memblock types is a nuisance as they live in different memblock structures which we can't walk at the same time. Take a second walk over memblock.reserved and add new 'reserved' subnodes for the memblock_reserved() regions that aren't already described by the existing code. (e.g. Kernel Code) We use reserve_region_with_split() to find the gaps in existing named regions. This handles the gap between 'kernel code' and 'kernel data' which is memblock_reserve()d, but already partially described by request_standard_resources(). e.g.: | 80000000-dfffffff : System RAM | 80080000-80ffffff : Kernel code | 81000000-8158ffff : reserved | 81590000-8237efff : Kernel data | a0000000-dfffffff : Crash kernel | e00f0000-f949ffff : System RAM reserve_region_with_split needs kzalloc() which isn't available when request_standard_resources() is called, use an initcall. Reported-by: Bhupesh Sharma <bhsharma@redhat.com> Reported-by: Tyler Baicar <tbaicar@codeaurora.org> Suggested-by: Akashi Takahiro <takahiro.akashi@linaro.org> Signed-off-by: James Morse <james.morse@arm.com> Fixes: d28f6df130 ("arm64/kexec: Add core kexec support") Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> CC: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>		2018-07-23 15:30:32 +01:00
..
boot	ARM64: hisi fixes for 4.18	2018-06-29 14:06:49 -07:00
configs	arm64: defconfig: renormalize based on recent additions	2018-06-23 10:24:25 -07:00
crypto	crypto: arm64/aes-blk - fix and move skcipher_walk_done out of kernel_neon_begin, _end	2018-06-15 23:06:46 +08:00
include	arm64: implement syscall wrappers	2018-07-12 14:49:48 +01:00
kernel	arm64: export memblock_reserve()d regions via /proc/iomem	2018-07-23 15:30:32 +01:00
kvm	kvm/arm: use PSR_AA32 definitions	2018-07-05 17:24:15 +01:00
lib	arm64: export tishift functions to modules	2018-05-21 19:00:48 +01:00
mm	arm64: kill config_sctlr_el1()	2018-07-12 14:40:38 +01:00
net	bpf, arm64: save 4 bytes in prologue when ebpf insns came from cbpf	2018-05-14 19:11:45 -07:00
xen	arm64: mm: Add additional parameter to uaccess_ttbr0_disable	2018-01-17 13:57:49 +01:00
Kconfig	arm64: implement syscall wrappers	2018-07-12 14:49:48 +01:00
Kconfig.debug
Kconfig.platforms	arm64: dts: renesas: Add Renesas R8A77990 Kconfig support	2018-05-16 10:44:01 +02:00
Makefile	arm64: build with baremetal linker target instead of Linux when available	2018-07-23 15:30:19 +01:00