From: Song Shuai suagrfillet@gmail.com
commit fbe7d19d2b7fcbd38905ba9f691be8f245c6faa6 upstream.
Since RISC-V Linux v6.4, the commit 3335068f8721 ("riscv: Use PUD/P4D/PGD pages for the linear mapping") changes phys_ram_base from the physical start of the kernel to the actual start of the DRAM.
The Crash-utility's VTOP() still uses phys_ram_base and kernel_map.virt_addr to translate kernel virtual address, that failed the Crash with Linux v6.4 [1].
Export kernel_map.va_kernel_pa_offset in vmcoreinfo to help Crash translate the kernel virtual address correctly.
Fixes: 3335068f8721 ("riscv: Use PUD/P4D/PGD pages for the linear mapping") Link: https://lore.kernel.org/linux-riscv/20230724040649.220279-1-suagrfillet@gmai... [1] Signed-off-by: Song Shuai suagrfillet@gmail.com Reviewed-by: Xianting Tian xianting.tian@linux.alibaba.com Reviewed-by: Alexandre Ghiti alexghiti@rivosinc.com Link: https://lore.kernel.org/r/20230724100917.309061-1-suagrfillet@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/riscv/kernel/crash_core.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/riscv/kernel/crash_core.c b/arch/riscv/kernel/crash_core.c index b351a3c01355..55f1d7856b54 100644 --- a/arch/riscv/kernel/crash_core.c +++ b/arch/riscv/kernel/crash_core.c @@ -18,4 +18,6 @@ void arch_crash_save_vmcoreinfo(void) vmcoreinfo_append_str("NUMBER(MODULES_END)=0x%lx\n", MODULES_END); #endif vmcoreinfo_append_str("NUMBER(KERNEL_LINK_ADDR)=0x%lx\n", KERNEL_LINK_ADDR); + vmcoreinfo_append_str("NUMBER(va_kernel_pa_offset)=0x%lx\n", + kernel_map.va_kernel_pa_offset); }