1 files changed, 32 insertions, 0 deletions

diff --git a/arch/x86/mm/debug_pagetables.c b/arch/x86/mm/debug_pagetables.c
index 421f2664ffa0..51a6f92da2bf 100644
--- a/arch/x86/mm/debug_pagetables.c
+++ b/arch/x86/mm/debug_pagetables.c
@@ -72,6 +72,31 @@ static const struct file_operations ptdump_curusr_fops = {
 };
 #endif
 
+#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
+extern pgd_t *efi_pgd;
+static struct dentry *pe_efi;
+
+static int ptdump_show_efi(struct seq_file *m, void *v)
+{
+        if (efi_pgd)
+                ptdump_walk_pgd_level_debugfs(m, efi_pgd, false);
+        return 0;
+}
+
+static int ptdump_open_efi(struct inode *inode, struct file *filp)
+{
+        return single_open(filp, ptdump_show_efi, NULL);
+}
+
+static const struct file_operations ptdump_efi_fops = {
+        .owner          = THIS_MODULE,
+        .open           = ptdump_open_efi,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+#endif
+
 static struct dentry *dir, *pe_knl, *pe_curknl;
 
 static int __init pt_dump_debug_init(void)
@@ -96,6 +121,13 @@ static int __init pt_dump_debug_init(void)
         if (!pe_curusr)
                 goto err;
 #endif
+
+#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
+        pe_efi = debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops);
+        if (!pe_efi)
+                goto err;
+#endif
+
         return 0;
 err:
         debugfs_remove_recursive(dir);