arm64 kexec kernel patches v11

Hi All,

This series adds the core support for kexec re-boot and kdump on ARM64. This version of the series combines Takahiro's kdump patches with my kexec patches.

To load a second stage kernel and execute a kexec re-boot or to work with kdump on ARM64 systems a series of patches to kexec-tools [2], which have not yet been merged upstream, are needed.

I have tested kexec with the ARM Foundation model, and Takahiro has reported that kdump is working on the 96boards HiKey developer board. Kexec on EFI systems works correctly. More ACPI + kexec testing is needed.

Patch 1 here moves the macros from proc-macros.S to asm/assembler.h so that the dcache_line_size macro it defines can be uesd by kexec's relocate kernel routine.

Patches 2 & 3 rework the ARM64 hcall mechanism to give the CPU reset routines the ability to switch exception levels from EL1 to EL2 for kernels that were entered in EL2.

Patch 4 allows KVM to handle a CPU reset.

Patches 5 & 6 add back the ARM64 CPU reset support that was recently removed from the kernel.

Patches 7 - 9 add kexec support.

Patches 10-15 add kdump support.

Please consider all patches for inclusion.

Changes since v10:

o Move the flush of the new image from arm64_relocate_new_kernel to machine_kexec.
o Pass values to arm64_relocate_new_kernel in registers, not in global variables.
o Fixups to setting the sctlr_el1 and sctlr_el2 flags.

[1] https://git.kernel.org/cgit/linux/kernel/git/geoff/linux-kexec.git
[2] https://git.kernel.org/cgit/linux/kernel/git/geoff/kexec-tools.git

-Geoff

The following changes since commit 6a13feb9c82803e2b815eca72fa7a9f5561d7861:

Linux 4.3 (2015-11-01 16:05:25 -0800)

are available in the git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/geoff/linux-kexec.git kexec-v11

for you to fetch changes up to 2b09b58c7586a4ca929400327d394fec3135fdd0:

arm64: kdump: relax BUG_ON() if more than one cpus are still active (2015-11-06 10:38:13 -0800)

----------------------------------------------------------------
AKASHI Takahiro (7):
arm64: kvm: allows kvm cpu hotplug
arm64: kdump: reserve memory for crash dump kernel
arm64: kdump: implement machine_crash_shutdown()
arm64: kdump: add kdump support
arm64: kdump: update a kernel doc
arm64: kdump: enable kdump in the arm64 defconfig
arm64: kdump: relax BUG_ON() if more than one cpus are still active

Geoff Levand (8):
arm64: Fold proc-macros.S into assembler.h
arm64: Convert hcalls to use HVC immediate value
arm64: Add new hcall HVC_CALL_FUNC
arm64: Add back cpu_reset routines Revert "arm64: remove dead code" arm64/kexec: Add core kexec support arm64/kexec: Add pr_devel output arm64/kexec: Enable kexec in the arm64 defconfig

 Documentation/kdump/kdump.txt       |  32 ++++-
 arch/arm/include/asm/kvm_host.h     |  10 +-
 arch/arm/include/asm/kvm_mmu.h      |   1 +
 arch/arm/kvm/arm.c                  |  79 ++++++------
 arch/arm/kvm/mmu.c                  |   5 +
 arch/arm64/Kconfig                  |  22 ++++
 arch/arm64/configs/defconfig        |   2 +
 arch/arm64/include/asm/assembler.h  |  48 ++++++-
 arch/arm64/include/asm/kexec.h      |  80 ++++++++++++
 arch/arm64/include/asm/kvm_host.h   |  16 ++-
 arch/arm64/include/asm/kvm_mmu.h    |   1 +
 arch/arm64/include/asm/mmu.h        |   1 +
 arch/arm64/include/asm/virt.h       |  49 +++++++
 arch/arm64/kernel/Makefile          |   3 +
 arch/arm64/kernel/cpu-reset.S       |  84 ++++++++++++
 arch/arm64/kernel/cpu-reset.h       |  22 ++++
 arch/arm64/kernel/crash_dump.c      |  71 +++++++++++
 arch/arm64/kernel/head.S            |   1 -
 arch/arm64/kernel/hyp-stub.S        |  43 +++++--
 arch/arm64/kernel/machine_kexec.c   | 248 ++++++++++++++++++++++++++++++++++++
 arch/arm64/kernel/relocate_kernel.S | 131 +++++++++++++++++++
 arch/arm64/kernel/setup.c           |   7 +-
 arch/arm64/kernel/smp.c             |  16 ++-
 arch/arm64/kvm/hyp-init.S           |  34 ++++-
 arch/arm64/kvm/hyp.S                |  44 +++++--
 arch/arm64/mm/cache.S               |   2 -
 arch/arm64/mm/init.c                |  83 ++++++++++++
 arch/arm64/mm/mmu.c                 |  11 ++
 arch/arm64/mm/proc-macros.S         |  64 ----------
 arch/arm64/mm/proc.S                |   3 -
 include/uapi/linux/kexec.h          |   1 +
 31 files changed, 1074 insertions(+), 140 deletions(-)
 create mode 100644 arch/arm64/include/asm/kexec.h
 create mode 100644 arch/arm64/kernel/cpu-reset.S
 create mode 100644 arch/arm64/kernel/cpu-reset.h
 create mode 100644 arch/arm64/kernel/crash_dump.c
 create mode 100644 arch/arm64/kernel/machine_kexec.c
 create mode 100644 arch/arm64/kernel/relocate_kernel.S
 delete mode 100644 arch/arm64/mm/proc-macros.S

2.5.0


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