Userspace utility needs to know if the corrupted kernel is in 5-level paging mode. So write 'pgtable_l5_enabled' to vmcoreinfo. It covers below three cases: pgtable_l5_enabled == 0 when Compile kernel with CONFIG_X86_5LEVEL=n Compile with CONFIG_X86_5LEVEL=y while cpu has no 'la57' flag
pgtable_l5_enabled != 0 when Compile with CONFIG_X86_5LEVEL=y and cpu has 'la57' flag Signed-off-by: Baoquan He <[email protected]> --- arch/x86/kernel/machine_kexec_64.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c index 1f790cf9d38f..5f3545eaa76a 100644 --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -350,6 +350,7 @@ void arch_crash_save_vmcoreinfo(void) { VMCOREINFO_NUMBER(phys_base); VMCOREINFO_SYMBOL(init_top_pgt); + VMCOREINFO_NUMBER(pgtable_l5_enabled); #ifdef CONFIG_NUMA VMCOREINFO_SYMBOL(node_data); -- 2.13.6
