Re: [PATCH 0/8] arm64 kexec kernel patches V6

[Anurup M <anurup.m@huawei.com>]

Hi Geoff,

	I get a relocation error  when I try to load using latest kexec-tools from https://git.linaro.org/people/geoff.levand/kexec-tools.git.

############## error log ###############
machine_apply_elf_rel: CALL26 94000000->97ffff62
sym: sha256_update info: 12 other: 00 shndx: 1 value: 5f58 size: 16c
sym: sha256_update value: 81af7f58 addr: 81af81e4
machine_apply_elf_rel: CALL26 94000000->97ffff5d
sym:      .data info: 03 other: 00 shndx: 4 value: 0 size: 0
sym: .data value: 81af8630 addr: 81af8550
machine_apply_elf_rel: ABS64 0->81af8630
Symbol: sha256_regions is in a bss section cannot set
##############

	What should be the problem? I use foundation model and the kernel image from
https://git.linaro.org/people/geoff.levand/linux-kexec.git branch: origin/kexec-v6
and rootfs from Linaro (http://releases.linaro.org/14.09/openembedded/aarch64)

	The above error is not seen when I use kexec-tools branch: origin/kdump.

	Also wish to know how to verify the kdump feature.

Thanks,
Anurup

> -----Original Message-----
> From: kexec [mailto:kexec-bounces@lists.infradead.org] On Behalf Of Geoff Levand
> Sent: Friday, November 14, 2014 6:52 AM
> To: Catalin Marinas; Will Deacon
> Cc: marc.zyngier@arm.com; Grant Likely; kexec@lists.infradead.org; linux-arm-kernel@lists.infradead.org; christoffer.dall@linaro.org
> Subject: [PATCH 0/8] arm64 kexec kernel patches V6
> 
> Hi All,
> 
> This series adds the core support for kexec re-boots on arm64.  I have tested with the ARM VE fast model, the ARM Base model and the ARM Foundation model with 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.
> 
> Patches 1-3 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.
> 
> Patch 4 moves proc-macros.S from arm64/mm to arm64/include/asm so that the dcache_line_size macro it defines can be uesd by kexec's relocate kernel routine.
> 
> Patches 5-8 add the actual kexec support.
> 
> 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
> 
> Several things are known to have problems on kexec re-boot:
> 
> spin-table
> ----------
> 
> PROBLEM: The spin-table enable method does not implement all the methods needed for CPU hot-plug, so the first stage kernel cannot be shutdown properly.
> 
> WORK-AROUND: Upgrade to system firmware that provides PSCI enable method support, OR build the first stage kernel with CONFIG_SMP=n, OR pass 'maxcpus=1'
> on the first stage kernel command line.
> 
> FIX: Upgrade system firmware to provide PSCI enable method support or add missing spin-table support to the kernel.
> 
> KVM
> ---
> 
> PROBLEM: KVM acquires hypervisor resources on startup, but does not free those resources on shutdown, so the first stage kernel cannot be shutdown properly.
> 
> WORK-AROUND:  Build the first stage kernel with CONFIG_KVM=n.
> 
> FIX: Fix KVM to support soft_restart().  KVM needs to restore default exception vectors, etc.
> 
> UEFI
> ----
> 
> PROBLEM: UEFI does not manage its runtime services virtual mappings in a way that is compatible with a kexec re-boot, so the second stage kernel hangs on boot-up.
> 
> WORK-AROUND: Disable UEFI in firmware, OR use EFI uboot emulation if provided by your firmware.
> 
> FIX: Fix kernel to manage UEFI virtual mappings properly.
> 
> /memreserve/
> ----------
> 
> PROBLEM: The use of device tree /memreserve/ entries is not compatible with kexec re-boot.  The second stage kernel will use the reserved regions and the system will become unstable.
> 
> WORK-AROUND: Pass a user specified DTB using the kexec --dtb option.
> 
> FIX: Convert device tree source files (.dts) and/or bootloaders to use device tree reserved-memory nodes to specify reserved memory or provide an in kernel mechanism to export the /memreserve/ entries to user space.
> 
> ACPI
> ----
> 
> PROBLEM: The kernel for ACPI based systems does not export a device tree to the standard user space location of 'proc/device-tree'.  Current applications expect to access device tree information from this standard location.
> 
> WORK-AROUND: Disable ACPI in firmware, OR pass 'acpi=off' on the first stage kernel command line, OR pass a user specified DTB using the kexec --dtb option.
> 
> FIX: Fix ACPI kernel support to export device tree information suitable for a kexec re-boot, and if this information is exported to somewhere other than 'proc/device-tree' update existing kexec user applications to use this new interface.
> 
> ----------------------------------------------------------------
> The following changes since commit 302cd37c417d59549d073a8986fd028998409cb9:
> 
>   arm64: kvm: eliminate literal pool entries (2014-11-07 15:04:54 +0000)
> 
> are available in the git repository at:
> 
>   git://git.linaro.org/people/geoff.levand/linux-kexec.git kexec-v6
> 
> for you to fetch changes up to 3fc5a4ba22342ccd8e7e5a09620b00f4b81667a6:
> 
>   arm64/kexec: Enable kexec in the arm64 defconfig (2014-11-13 16:52:16 -0800)
> 
> ----------------------------------------------------------------
> Geoff Levand (8):
>       arm64: Convert hcalls to use ISS field
>       arm64: Add new hcall HVC_CALL_FUNC
>       arm64: Add EL2 switch to soft_restart
>       arm64: Move proc-macros.S to include/asm
>       arm64/kexec: Add core kexec support
>       arm64/kexec: Add pr_devel output
>       arm64/kexec: Add checks for KVM and EFI
>       arm64/kexec: Enable kexec in the arm64 defconfig
> 
>  arch/arm64/Kconfig                           |   9 ++
>  arch/arm64/configs/defconfig                 |   1 +
>  arch/arm64/include/asm/kexec.h               |  47 ++++++
>  arch/arm64/include/asm/proc-fns.h            |   4 +-
>  arch/arm64/{mm => include/asm}/proc-macros.S |   0
>  arch/arm64/include/asm/virt.h                |  33 ++++
>  arch/arm64/kernel/Makefile                   |   1 +
>  arch/arm64/kernel/hyp-stub.S                 |  45 ++++--
>  arch/arm64/kernel/machine_kexec.c            | 232 +++++++++++++++++++++++++++
>  arch/arm64/kernel/process.c                  |  10 +-
>  arch/arm64/kernel/relocate_kernel.S          | 160 ++++++++++++++++++
>  arch/arm64/kvm/hyp.S                         |  18 ++-
>  arch/arm64/mm/cache.S                        |   3 +-
>  arch/arm64/mm/proc.S                         |  50 ++++--
>  include/uapi/linux/kexec.h                   |   1 +
>  15 files changed, 576 insertions(+), 38 deletions(-)  create mode 100644 arch/arm64/include/asm/kexec.h  rename arch/arm64/{mm => include/asm}/proc-macros.S (100%)  create mode 100644 arch/arm64/kernel/machine_kexec.c  create mode 100644 arch/arm64/kernel/relocate_kernel.S
> 
> --
> 1.9.1
> 
> 
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> 
> .
> 


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