Hi All, This series adds the core support for kexec re-boots on arm64. I have tested with the ARM VE fast model using various kernel config options for both the first and second stage kernels. To load a second stage kernel and execute a kexec re-boot on arm64 my patches to kexec-tools [2], which have not yet been merged upstream, are needed. This series does not include some re-work of the spin-table CPU enable method that is needed to support it, nor does it include some re-work of KVM to support CPU soft reset. A kernel built with these patches will boot and run correctly, but will fail to load a kexec kernel if running on a machine with any spin-table enabled CPUs and will fail the kexec re-boot if the first stage kernel was built with CONFIG_KVM=y. Work-in-progress patches to support these are in the master branch of my linux-kexec repository [1]. Patches 1-5 rework the arm64 hcall mechanism to give the arm64 soft_restart() routine the ability to switch exception levels from EL1 to EL2 for kernels that were entered in EL2. Patches 6 and 7 add two new arm64 generic routines read_cpu_properties() and local_disable() that the kexec code uses. Patches 8-10 fixup machine_shutdown() to work correctly for a kexec re-boot. The implementation relies on the effects of smp_send_stop() to shutdown the secondary processors of an SMP system via the cpu_disable and cpu_die methods of the arm64 cpu_ops structure. Patches 11 and 12 add the actual kexec support. Patch 13 adds a kernel command line parameter kexec_ignore_compat_check for expert users to give more control over loading second stage kernels. Please consider all patches for inclusion. Any comments or suggestions on how to improve are welcome. [1] https://git.linaro.org/people/geoff.levand/linux-kexec.git [2] https://git.linaro.org/people/geoff.levand/kexec-tools.git -Geoff The following changes since commit e3672649faae400e8a598938766a63f395a27ae6: arm64: defconfig: increase NR_CPUS default to 64 (2014-09-08 14:55:27 +0100) are available in the git repository at: git://git.linaro.org/people/geoff.levand/linux-kexec.git kexec-v2 for you to fetch changes up to 99f09410a26c001efd06c270aa2e348d6cac6b01: arm64/kexec: Add kexec_ignore_compat_check param (2014-09-09 15:33:48 -0700) Geoff Levand (13): arm64: Add ESR_EL2_EC macros to hyp-stub arm64/kvm: Fix assembler compatibility of macros arm64: Convert hcalls to use ISS field arm64: Add new hcall HVC_CALL_FUNC arm64: Add EL2 switch to soft_restart arm64: Add new routine read_cpu_properties arm64: Add new routine local_disable arm64: Use cpu_ops for smp_stop arm64/kexec: Kexec expects cpu_die arm64/kexec: Revert change to machine_shutdown() arm64/kexec: Add core kexec support arm64/kexec: Enable kexec in the arm64 defconfig arm64/kexec: Add kexec_ignore_compat_check param Documentation/kernel-parameters.txt | 13 + arch/arm64/Kconfig | 8 + arch/arm64/configs/defconfig | 1 + arch/arm64/include/asm/cpu_ops.h | 2 +- arch/arm64/include/asm/irqflags.h | 13 + arch/arm64/include/asm/kexec.h | 52 +++ arch/arm64/include/asm/kvm_arm.h | 2 +- arch/arm64/include/asm/proc-fns.h | 4 +- arch/arm64/include/asm/virt.h | 31 ++ arch/arm64/kernel/Makefile | 2 + arch/arm64/kernel/cpu-properties.c | 58 ++++ arch/arm64/kernel/cpu-properties.h | 39 +++ arch/arm64/kernel/hyp-stub.S | 51 ++- arch/arm64/kernel/machine_kexec.c | 627 ++++++++++++++++++++++++++++++++++++ arch/arm64/kernel/process.c | 15 +- arch/arm64/kernel/psci.c | 4 +- arch/arm64/kernel/relocate_kernel.S | 185 +++++++++++ arch/arm64/kernel/smp.c | 9 + arch/arm64/kvm/hyp.S | 19 +- arch/arm64/mm/proc.S | 47 ++- include/uapi/linux/kexec.h | 1 + 21 files changed, 1139 insertions(+), 44 deletions(-) create mode 100644 arch/arm64/include/asm/kexec.h create mode 100644 arch/arm64/kernel/cpu-properties.c create mode 100644 arch/arm64/kernel/cpu-properties.h create mode 100644 arch/arm64/kernel/machine_kexec.c create mode 100644 arch/arm64/kernel/relocate_kernel.S -- 1.9.1
