This patch series is a set of bug fixes to address kexec/kdump failures which are sometimes observed on ACPI-only system and reported in LAK-ML before.
In short, the phenomena are: 1. kexec'ed kernel can fail to boot because some ACPI table is corrupted by a new kernel (or other data) being loaded into System RAM. Currently kexec may possibly allocate space ignoring such "reserved" regions. We will see no messages after "Bye!" 2. crash dump (kdump) kernel can fail to boot and get into panic due to an alignment fault when accessing ACPI tables. This can happen because those tables are not always properly aligned while they are mapped non-cacheable (ioremap'ed) as they are not recognized as part of System RAM under the current implementation. After discussing several possibilities to address those issues, the agreed approach, in my understanding, is * to add resource entries for every "reserved", i.e. memblock_reserve(), regions to /proc/iomem. (NOMAP regions, also marked as "reserved," remains at top-level for backward compatibility. User-space can tell the difference between reserved-system-ram and reserved-address-space.) * For case (1), user space (kexec-tools) should rule out such regions in searching for free space for loaded data. * For case (2), the kernel should access ACPI tables by mapping them with appropriate memory attributes described in UEFI memory map. (This means that it doesn't require any changes in /proc/iomem, and hence user space.) Please find past discussions about /proc/iomem in [1]. --- more words from James --- Our attempts to fix this just in the kernel reached a dead end, because Kdump needs to include reserved-system-ram, whereas kexec has to avoid it. User-space needs to be able to tell reserved-system-ram and reserved-address-space apart. Hence we need to expose that information, and pick it up in user-space. Patched-kernel and unpatch-user-space will work the same way it does today, as the additional reserved regions are ignored by user-space. Unpatched-kernel and patched-user-space will also work the same way it does today as the additional reserved regions are missing. --->8--- Patch#1 addresses kexec case, for which you are also required to update user space. See necessary patches in [2]. If you want to review Patch#1, please also take a look at and review [2]. Patch#2 and #3 addresses kdump case. Ard's patch [4] needs to be applied preliminarily. Changes in v3 (2018, July 9, 2018) * drop the v2's patch#3, preferring [4] Changes in v2 (2018, June 19, 2018) * re-organise v1's patch#2 and #3 into v2's #2, #3 and #4 not to break bisect [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2018-March/565980.html [2] https://git.linaro.org/people/takahiro.akashi/kexec-tools.git arm64/resv_mem [3] http://lists.infradead.org/pipermail/linux-arm-kernel/2018-April/573655.html [4] https://marc.info/?l=linux-efi&m=152930773507524&w=2 AKASHI Takahiro (2): efi/arm: map UEFI memory map even w/o runtime services enabled arm64: acpi: fix alignment fault in accessing ACPI James Morse (1): arm64: export memblock_reserve()d regions via /proc/iomem arch/arm64/include/asm/acpi.h | 23 ++++++++++++------ arch/arm64/kernel/acpi.c | 11 +++------ arch/arm64/kernel/setup.c | 38 ++++++++++++++++++++++++++++++ drivers/firmware/efi/arm-runtime.c | 14 +++++------ 4 files changed, 64 insertions(+), 22 deletions(-) -- 2.17.0
