[PATCH v4 3/4] kaslr: disable memory mirror feature when movable_node

[Chao Fan]

In kernel code, if movable_node specified, it will skip the mirror
feature. So we should also skip mirror feature in kaslr.

Cc: linux-doc@xxxxxxxxxxxxxxx
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Chao Fan <fanc.fnst@xxxxxxxxxxxxxx>
---
 arch/x86/boot/compressed/kaslr.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index fe49d6e79c50..203bec3d400d 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -714,6 +714,7 @@ static bool
 process_efi_entries(unsigned long minimum, unsigned long image_size)
 {
 	struct efi_info *e = &boot_params->efi_info;
+	char *args = (char *)get_cmd_line_ptr();
 	bool efi_mirror_found = false;
 	struct mem_vector region;
 	efi_memory_desc_t *md;
@@ -747,6 +748,12 @@ process_efi_entries(unsigned long minimum, unsigned long image_size)
 		}
 	}
 
+#ifdef CONFIG_MEMORY_HOTPLUG
+	/* Skip memory mirror if movabale_node or immovable_mem specified */
+	if (strstr(args, "movable_node"))
+		efi_mirror_found = false;
+#endif
+
 	for (i = 0; i < nr_desc; i++) {
 		md = efi_early_memdesc_ptr(pmap, e->efi_memdesc_size, i);
 
-- 
2.14.3