On Sat, 11 Jan, at 09:49:27PM, Borislav Petkov wrote:
> From: Borislav Petkov <bp@xxxxxxx>
>
> With reusing the ->trampoline_pgd page table for mapping EFI regions in
> order to use them after having switched to EFI virtual mode, it is very
> useful to be able to dump aforementioned page table in dmesg. This adds
> that functionality through the walk_pgd_level() interface which can be
> called from somewhere else.
>
> The original functionality of dumping to debugfs remains untouched.
>
> Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
> Signed-off-by: Borislav Petkov <bp@xxxxxxx>
> ---
> arch/x86/include/asm/pgtable.h | 3 +-
> arch/x86/mm/dump_pagetables.c | 77 ++++++++++++++++++++++++++++--------------
> 2 files changed, 53 insertions(+), 27 deletions(-)
[...]
> @@ -296,7 +316,7 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
> #define pgd_none(a) pud_none(__pud(pgd_val(a)))
> #endif
>
> -static void walk_pgd_level(struct seq_file *m)
> +void walk_pgd_level(struct seq_file *m, pgd_t *pgd)
> {
If you're going to start exporting this function, might I suggest
renaming it something like ptdump_walk_pgd_level()?
--
Matt Fleming, Intel Open Source Technology Center
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