From: Song Shuai Date: Mon, 24 Jul 2023 10:09:16 +0000 (+0800) Subject: riscv: Export va_kernel_pa_offset in vmcoreinfo X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=fbe7d19d2b7fcbd38905ba9f691be8f245c6faa6;p=linux.git riscv: Export va_kernel_pa_offset in vmcoreinfo 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@gmail.com/ [1] Signed-off-by: Song Shuai Reviewed-by: Xianting Tian  Reviewed-by: Alexandre Ghiti Link: https://lore.kernel.org/r/20230724100917.309061-1-suagrfillet@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt --- diff --git a/arch/riscv/kernel/crash_core.c b/arch/riscv/kernel/crash_core.c index b351a3c013555..55f1d7856b544 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); }