Commit-ID: c100a583601d357f923c41af5434dc1f8d07890f
Gitweb: https://git.kernel.org/tip/c100a583601d357f923c41af5434dc1f8d07890f
Author: Baoquan He <bhe@xxxxxxxxxx>
AuthorDate: Fri, 2 Mar 2018 13:18:01 +0800
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 12 Mar 2018 09:43:56 +0100
kdump, vmcoreinfo: Export pgtable_l5_enabled value
User-space utilities examining crash-kernels need to know if the
crashed kernel was in 5-level paging mode or not.
So write 'pgtable_l5_enabled' to vmcoreinfo, which covers these
three cases:
pgtable_l5_enabled == 0 when:
- Compiled with !CONFIG_X86_5LEVEL
- Compiled with CONFIG_X86_5LEVEL=y while CPU has no 'la57' flag
pgtable_l5_enabled != 0 when:
- Compiled with CONFIG_X86_5LEVEL=y and CPU has 'la57' flag
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: douly.fnst@xxxxxxxxxxxxxx
Cc: dyoung@xxxxxxxxxx
Cc: ebiederm@xxxxxxxxxxxx
Cc: kirill.shutemov@xxxxxxxxxxxxxxx
Cc: vgoyal@xxxxxxxxxx
Link: http://lkml.kernel.org/r/20180302051801.19594-1-bhe@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
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 3b7427aa7d85..02f913cb27b5 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);
--
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