[PATCH 2/2] riscv: export kaslr offset and satp in VMCOREINFO ELF notes

[PATCH 2/2] riscv: export kaslr offset and satp in VMCOREINFO ELF notes

[Austin Kim]

From: Austin Kim <austin.kim@lge.com>

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>
---
 arch/riscv/kernel/vmcore_info.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/riscv/kernel/vmcore_info.c b/arch/riscv/kernel/vmcore_info.c
index d5e448aa9..682ba423c 100644
--- a/arch/riscv/kernel/vmcore_info.c
+++ b/arch/riscv/kernel/vmcore_info.c
@@ -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
 }
-- 
2.34.1


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Re: [PATCH 2/2] riscv: export kaslr offset and satp in VMCOREINFO ELF notes

[Paul Walmsley]

On Wed, 11 Feb 2026, Austin Kim wrote:

> From: Austin Kim <austin.kim@lge.com>
> 
> 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>

Thanks, queued for v7.0-rc.


- Paul

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