These 2 patches add riscv64 support for makedumpfile:
Patch1 - Add riscv64 support
===========================
This patch adds support for riscv64 in makedumpfile.
It implements the "vtop" for kenrel memory regions
and supports Sv39/Sv48/Sv57 page modes for RV64.
Patch2 - riscv64: Correct the pfn_start for flatmem
==================================================
This patch temporarily fixes a issue of the tests about FLATMEM,
as the commit-msg says:
To let info->max_mapnr indicte the direct max PFN and then
make the kdump header's max_mapnr_64 correct, riscv64 port
didn't define ARCH_PFN_OFFSET.
As for FLATMEM type, the pfn region of mem_map_data should
be adjusted to start from info->phys_base instead of zero.
Not taking other arches into consideration and test, so I simplely
judge the __riscv64__ instead of ARCH_PFN_OFFSET. Maybe we can improve it.
Tests
=====
With these 2 patches, the following tests had passed in RV64 Qemu virt machine:
Preparation:
-----------
1. build kernel with FLATMEM and SPARSE memory models
2. boot kernel with 3 different page-modes by setting nov4l/nov5l in cmdline
3. panic kernel
Tests:
-----
1. create kdump-compressed file via this command
- `/mnt/mkdf_f -d31 -f -c /proc/vmcore /mnt/dump.file1`
- or with `--vtop` option to translate some typical addresses (like:
kernel_link_addr, vmalloc_start, page_offset)
2. start crash with kdump file and do some VTOPs
A test log:
-----------
# With the Sv57 and SPARSE_EXTREME kernel
# vtop the vmalloc start address -- 0xff20000000000000
# /mnt/mkdf_f --vtop 0xff20000000000000 -d31 -f --non-mmap -c /proc/vmcore /mnt/dump.file1
Translating virtual address ff20000000000000 to physical address.
VIRTUAL PHYSICAL
ff20000000000000 80087000
Copying data : [100.0 %] |
eta: 0s
The dumpfile is saved to /mnt/dump.file1.
makedumpfile Completed.
# sudo ../crash/crash /home/song/9_linux/linux/00_rv_def/vmlinux /tmp/hello/dump.file1
...
KERNEL: /home/song/9_linux/linux/00_rv_def/vmlinux
DUMPFILE: /tmp/hello/dump.file1 [PARTIAL DUMP]
CPUS: 2
DATE: Wed Sep 27 18:37:45 CST 2023
UPTIME: 00:00:18
LOAD AVERAGE: 0.00, 0.00, 0.00
TASKS: 55
NODENAME: (none)
RELEASE: 6.6.0-rc1-00007-g22bfc766389c
VERSION: #1 SMP Mon Sep 25 19:29:05 CST 2023
MACHINE: riscv64 (unknown Mhz)
MEMORY: 511.8 MB
PANIC: "Kernel panic - not syncing: sysrq triggered crash"
PID: 1
COMMAND: "sh"
TASK: ff600000000e0000 [THREAD_INFO: ff600000000e0000]
CPU: 1
STATE: TASK_RUNNING (PANIC)
crash> vtop 0xff20000000000000
VIRTUAL PHYSICAL
ff20000000000000 80087000
PGD: ffffffff814fa900 => 20010c01
P4D: 0000000080043000 => 0000000020025401
PUD: 0000000080095000 => 0000000020025801
PMD: 0000000080096000 => 0000000020026001
PTE: 80098000 => 20021ce7
PAGE: 0000000080087000
PTE PHYSICAL FLAGS
20021ce7 80087000 (PRESENT|READ|WRITE|GLOBAL|ACCESSED|DIRTY)
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
ff1c0000020021c0 80087000 0 0 1 0 // same as the makedumpfile's vtop
Song Shuai (2):
Add riscv64 support
riscv64: Correct the pfn_start for flatmem
Makefile | 2 +-
arch/riscv64.c | 219 +++++++++++++++++++++++++++++++++++++++++++++++++
makedumpfile.c | 18 ++++
makedumpfile.h | 107 ++++++++++++++++++++++++
4 files changed, 345 insertions(+), 1 deletion(-)
create mode 100644 arch/riscv64.c
--
2.20.1
_______________________________________________
kexec mailing list
kexec@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/kexec
