Hi Maintainers, This patchset adds support for kexec re-boots on arm64. I have tested with the VE fast model using various kernel config options with both spin and psci enable methods. I'll continue to test in the coming weeks. I tried to re-use the existing hot plug cpu_ops support for the secondary CPU shutdown as much as possible, but needed to do some things specific to kexec that I couldn't do with what was already there. A significant change is in [PATCH 4/8] (arm64: Add smp_spin_table_set_die) where I add the ability to setup a custom cpu_die handler. To get the the spin-table secondary CPUs into the proper state described in Documentation/arm64/booting.txt I use a three step spin loop. First in the kernel's virtual address space, then to the identity mapped address, then jump to the final spin code in the 2nd stage kernel's /memreserve/ area. To support this three step spin I needed [PATCH 5/8] (arm64: Split soft_restart into two stages). Please see the patch comments for more info. If we added the 2nd stage kernel's /memreserve/ area to the identity map we could eliminate the middle step and go from the VA space to the /memreserve/ area directly. Please consider all patches for inclusion. Any comments or suggestions on how to improve would be very welcome. To load a kexec kernel and execute a kexec re-boot on arm64 my patches to kexec-tools, which have not yet been merged upstream, are needed: https://git.linaro.org/people/geoff.levand/kexec-tools.git -Geoff The following changes since commit 89ca3b881987f5a4be4c5dbaa7f0df12bbdde2fd: Linux 3.15-rc4 (2014-05-04 18:14:42 -0700) are available in the git repository at: git://git.linaro.org/people/geoff.levand/linux-kexec.git for-arm64-kexec for you to fetch changes up to 32399380e2249697ca549848ef83e5706eb4d83c: arm64: Enable kexec in defconfig (2014-05-08 17:09:27 -0700) ---------------------------------------------------------------- Geoff Levand (8): arm64: Use cpu_ops for smp_stop arm64: Make cpu_read_ops generic arm64: Add spin-table cpu_die arm64: Add smp_spin_table_set_die arm64: Split soft_restart into two stages arm64/kexec: kexec needs cpu_die arm64/kexec: Add core kexec support arm64: Enable kexec in defconfig MAINTAINERS | 9 + arch/arm64/Kconfig | 8 + arch/arm64/configs/defconfig | 1 + arch/arm64/include/asm/cpu_ops.h | 5 +- arch/arm64/include/asm/kexec.h | 44 +++ arch/arm64/include/asm/system_misc.h | 1 + arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/cpu_ops.c | 11 +- arch/arm64/kernel/machine_kexec.c | 623 +++++++++++++++++++++++++++++++++++ arch/arm64/kernel/process.c | 4 +- arch/arm64/kernel/psci.c | 4 +- arch/arm64/kernel/relocate_kernel.S | 239 ++++++++++++++ arch/arm64/kernel/smp.c | 10 +- arch/arm64/kernel/smp_spin_table.c | 21 +- include/uapi/linux/kexec.h | 1 + 15 files changed, 969 insertions(+), 13 deletions(-) create mode 100644 arch/arm64/include/asm/kexec.h create mode 100644 arch/arm64/kernel/machine_kexec.c create mode 100644 arch/arm64/kernel/relocate_kernel.S -- 1.9.1
