Unverified Commit fbe7d19d authored by Song Shuai's avatar Song Shuai Committed by Palmer Dabbelt
Browse files

riscv: Export va_kernel_pa_offset in vmcoreinfo 

Since RISC-V Linux v6.4, the commit 3335068f ("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: 3335068f ("riscv: Use PUD/P4D/PGD pages for the linear mapping")
Link: https://lore.kernel.org/linux-riscv/20230724040649.220279-1-suagrfillet@gmail.com/

 [1]
Signed-off-by: default avatarSong Shuai <suagrfillet@gmail.com>
Reviewed-by: default avatarXianting Tian&nbsp; <xianting.tian@linux.alibaba.com>
Reviewed-by: default avatarAlexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20230724100917.309061-1-suagrfillet@gmail.com
Cc: stable@vger.kernel.org
Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 568701fe

arch/riscv/kernel/crash_core.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

}