From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/x86/mm/debug_pagetables.c | 75 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 arch/x86/mm/debug_pagetables.c (limited to 'arch/x86/mm/debug_pagetables.c') diff --git a/arch/x86/mm/debug_pagetables.c b/arch/x86/mm/debug_pagetables.c new file mode 100644 index 0000000000..b43301cb2a --- /dev/null +++ b/arch/x86/mm/debug_pagetables.c @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include + +static int ptdump_show(struct seq_file *m, void *v) +{ + ptdump_walk_pgd_level_debugfs(m, &init_mm, false); + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(ptdump); + +static int ptdump_curknl_show(struct seq_file *m, void *v) +{ + if (current->mm->pgd) + ptdump_walk_pgd_level_debugfs(m, current->mm, false); + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(ptdump_curknl); + +#ifdef CONFIG_PAGE_TABLE_ISOLATION +static int ptdump_curusr_show(struct seq_file *m, void *v) +{ + if (current->mm->pgd) + ptdump_walk_pgd_level_debugfs(m, current->mm, true); + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(ptdump_curusr); +#endif + +#if defined(CONFIG_EFI) && defined(CONFIG_X86_64) +static int ptdump_efi_show(struct seq_file *m, void *v) +{ + if (efi_mm.pgd) + ptdump_walk_pgd_level_debugfs(m, &efi_mm, false); + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(ptdump_efi); +#endif + +static struct dentry *dir; + +static int __init pt_dump_debug_init(void) +{ + dir = debugfs_create_dir("page_tables", NULL); + + debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops); + debugfs_create_file("current_kernel", 0400, dir, NULL, + &ptdump_curknl_fops); + +#ifdef CONFIG_PAGE_TABLE_ISOLATION + debugfs_create_file("current_user", 0400, dir, NULL, + &ptdump_curusr_fops); +#endif +#if defined(CONFIG_EFI) && defined(CONFIG_X86_64) + debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops); +#endif + return 0; +} + +static void __exit pt_dump_debug_exit(void) +{ + debugfs_remove_recursive(dir); +} + +module_init(pt_dump_debug_init); +module_exit(pt_dump_debug_exit); +MODULE_AUTHOR("Arjan van de Ven "); +MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables"); -- cgit v1.2.3