[PATCH 00/10] arm64 kexec kernel patches V5

[Arun Chandran]

Hi Geoff,

I am trying this on my hardware (apm-mustang.dtb)

On Fri, Oct 24, 2014 at 4:40 AM, Geoff Levand <geoff at infradead.org> wrote:
> 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 1-4 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 5 and 6 convert the use of device tree /memreserve/ to device tree
> reserved-memory nodes.
>
> Patch 7 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 8-10 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.

I have CONFIG_SMP=n

>
> FIX: Upgrade system firmware to provide PSCI enable method support.
>
> 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.

KVM also disabled.

/root at genericarmv8:~# usr/local/sbin/kexec --lite -l vmlinux
--dtb=apm-mustang.dtb --command-line=
"root=/dev/nfs rw
nfsroot=10.162.103.145:/nfs_root/linaro-image-lamp-genericarmv8,nfsvers=3
 ip=:::::eth0:dhcp panic=1 console=ttyS0,115200
earlyprintk=uart8250-32bit,0x1c020000"

kexec version: 14.10.21.16.36-ga38e0a6
arch_process_options:85: command_line: root=/dev/nfs rw
nfsroot=10.162.103.145:/nfs_root/linaro-image-lamp-genericarmv8,nfsvers=3
ip=:::::eth0:dhcp panic=1 console=ttyS0,115200
earlyprintk=uart8250-32bit,0x1
c020000
arch_process_options:87: initrd: (null)
arch_process_options:88: dtb: apm-mustang.dtb
arch_process_options:89: lite: 1
kernel: 0x7f756e7010 kernel_size: 0x488a308
Modified cmdline: root=/dev/nfs
Unable to find /proc/device-tree//chosen/linux,stdout-path, printing
from purgatory is diabled
get_memory_ranges_dt:638: node_1516 memory
get_memory_ranges_dt:664:  RAM: 0000004000000000 - 0000004400000000
get_memory_ranges_dt:659: SKIP: 0000000000000000 - 0000000000000000
get_memory_ranges_dt:659: SKIP: 0000000000000000 - 0000000000000000
get_memory_ranges_dt:659: SKIP: 0000000000000000 - 0000000000000000
get_memory_ranges_dt:678: Success
elf_arm64_load: PE format: yes
p_vaddr: ffffffc000080000
virt_to_phys: ffffffc000080000 -> 0000004000080000
add_segment_phys_virt: 0000007f756f7010 - 0000007f75d3cf70 (00645f60)
-> 0000004000080000 - 00000040006fb000 (0067b000)
elf_arm64_load: text_offset: 0000000000080000
elf_arm64_load: image_size:  000000000067f000
elf_arm64_load: page_offset: ffffffc000000000
elf_arm64_load: memstart:    0000004000000000
virt_to_phys: ffffffc000080000 -> 0000004000080000
elf_arm64_load: e_entry:     ffffffc000080000 -> 0000004000080000
virt_to_phys: ffffffc000080000 -> 0000004000080000
Modified cmdline:root=/dev/nfs rw
nfsroot=10.162.103.145:/nfs_root/linaro-image-lamp-genericarmv8,nfsvers=3
ip=:::::eth0:dhcp panic=1 console=ttyS0,115200
earlyprintk=uart8250-32bit,0x1c020000
Unable to find /proc/device-tree//chosen/linux,stdout-path, printing
from purgatory is diabled
read_cpu_info: dtb_1 cpu-0 (/cpus/cpu at 000): hwid-0, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_1 cpu-1 (/cpus/cpu at 001): hwid-1, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_1 cpu-2 (/cpus/cpu at 100): hwid-100, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_1 cpu-3 (/cpus/cpu at 101): hwid-101, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_1 cpu-4 (/cpus/cpu at 200): hwid-200, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_1 cpu-5 (/cpus/cpu at 201): hwid-201, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_1 cpu-6 (/cpus/cpu at 300): hwid-300, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_1 cpu-7 (/cpus/cpu at 301): hwid-301, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_2 cpu-0 (/cpus/cpu at 000): hwid-0, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_2 cpu-1 (/cpus/cpu at 001): hwid-1, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_2 cpu-2 (/cpus/cpu at 100): hwid-100, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_2 cpu-3 (/cpus/cpu at 101): hwid-101, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_2 cpu-4 (/cpus/cpu at 200): hwid-200, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_2 cpu-5 (/cpus/cpu at 201): hwid-201, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_2 cpu-6 (/cpus/cpu at 300): hwid-300, 'spin-table',
cpu-release-addr 400000fff8
read_cpu_info: dtb_2 cpu-7 (/cpus/cpu at 301): hwid-301, 'spin-table',
cpu-release-addr 400000fff8
check_cpu_properties: hwid-0: OK
check_cpu_properties: hwid-1: OK
check_cpu_properties: hwid-100: OK
check_cpu_properties: hwid-101: OK
check_cpu_properties: hwid-200: OK
check_cpu_properties: hwid-201: OK
check_cpu_properties: hwid-300: OK
check_cpu_properties: hwid-301: OK
dtb:    base 4000700000, size 221ch (8732)
add_segment_phys_virt: 0000000024c14c90 - 0000000024c16eac (0000221c)
-> 0000004000700000 - 0000004000703000 (00003000)
kexec_load: entry = 0x4000080000 flags = 0xb70000
nr_segments = 2
segment[0].buf   = 0x7f756f7010
segment[0].bufsz = 0x645f60
segment[0].mem   = 0x4000080000
segment[0].memsz = 0x67b000
segment[1].buf   = 0x24c14c90
segment[1].bufsz = 0x221c
segment[1].mem   = 0x4000700000
segment[1].memsz = 0x3000

root at genericarmv8:~# /usr/local/sbin/kexec --lite -e
kexec version: 14.10.21.16.36-ga38e0a6
arch_process_options:85: command_line: (null)
arch_process_options:87: initrd: (null)
arch_process_options:88: dtb: (null)
arch_process_options:89: lite: 1
sd 0:0:0:0: [sda] Synchronizing SCSI cache
kexec: Starting new kernel
Bye!

It fails to come up.  In debugger I can see

    Core number       : 0
    Core state        : debug (AArch64 EL1)
    Debug entry cause : External Debug Request
    Current PC        : 0xffffffc000083200
    Current CPSR      : 0x600003c5 (EL1h)

It went to the second stage. But hang.

Am I missing something?

--Arun