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riscv: export kaslr offset and satp in VMCOREINFO ELF notes

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The following options are required by the kdump crash utility for RISC-V
based vmcore file:

- kaslr: If the vmcore is generated from a KASLR-enabled Linux kernel,
         the KASLR offset is required for the crash utility to load
         the vmcore. Without the proper kaslr option, the crash utility
         fails to load the vmcore file.
- satp: The exact root page table address helps determine the correct base
        PGD address.

With this patch, RISC-V VMCOREINFO ELF notes now include both kaslr
and satp information.

Signed-off-by: Austin Kim <austin.kim@lge.com>
Link: https://patch.msgid.link/aYwKUE3ZzN7/ZY/A@adminpc-PowerEdge-R7525
Signed-off-by: Paul Walmsley <pjw@kernel.org>
This commit is contained in:
Austin Kim 2026-04-04 18:42:40 -06:00 committed by Paul Walmsley
parent ce3a360a6d
commit d8e99133eb
1 changed files with 7 additions and 0 deletions
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7
arch/riscv/kernel/vmcore_info.c
View File

@ -3,6 +3,11 @@
#include <linux/vmcore_info.h>
#include <linux/pagemap.h>
static inline u64 get_satp_value(void)
{
return csr_read(CSR_SATP);
}
void arch_crash_save_vmcoreinfo(void)
{
VMCOREINFO_NUMBER(phys_ram_base);
@ -27,5 +32,7 @@ void arch_crash_save_vmcoreinfo(void)
#else
vmcoreinfo_append_str("NUMBER(va_kernel_pa_offset)=0x%lx\n",
kernel_map.va_kernel_pa_offset);
vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset());
vmcoreinfo_append_str("NUMBER(satp)=0x%llx\n", get_satp_value());
#endif
}