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Subject[tip:x86/mm] kdump, vmcoreinfo: Export pgtable_l5_enabled value
Commit-ID:  c100a583601d357f923c41af5434dc1f8d07890f
Gitweb: https://git.kernel.org/tip/c100a583601d357f923c41af5434dc1f8d07890f
Author: Baoquan He <bhe@redhat.com>
AuthorDate: Fri, 2 Mar 2018 13:18:01 +0800
Committer: Ingo Molnar <mingo@kernel.org>
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@redhat.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: douly.fnst@cn.fujitsu.com
Cc: dyoung@redhat.com
Cc: ebiederm@xmission.com
Cc: kirill.shutemov@linux.intel.com
Cc: vgoyal@redhat.com
Link: http://lkml.kernel.org/r/20180302051801.19594-1-bhe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
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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