Commit 75298aa1 authored Dec 04, 2017 by Borislav Petkov Committed by Ingo Molnar Dec 23, 2017

x86/mm/dump_pagetables: Add page table directory to the debugfs VFS hierarchy



The upcoming support for dumping the kernel and the user space page tables
of the current process would create more random files in the top level
debugfs directory.

Add a page table directory and move the existing file to it.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Eduardo Valentin <eduval@amazon.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 385ce0ea

arch/x86/mm/debug_pagetables.c

+10 −5

Original line number	Diff line number	Diff line
		@@ -22,21 +22,26 @@ static const struct file_operations ptdump_fops = {
		.release = single_release,
		};

		static struct dentry *pe;
		static struct dentry dir, pe;

		static int __init pt_dump_debug_init(void)
		{
		pe = debugfs_create_file("kernel_page_tables", S_IRUSR, NULL, NULL,
		&ptdump_fops);
		if (!pe)
		dir = debugfs_create_dir("page_tables", NULL);
		if (!dir)
		return -ENOMEM;

		pe = debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops);
		if (!pe)
		goto err;
		return 0;
		err:
		debugfs_remove_recursive(dir);
		return -ENOMEM;
		}

		static void __exit pt_dump_debug_exit(void)
		{
		debugfs_remove_recursive(pe);
		debugfs_remove_recursive(dir);
		}

		module_init(pt_dump_debug_init);