diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index 57fa2dbf3f7a..d61e40466d78 100644
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -887,6 +887,7 @@ void xen_mm_pin_all(void)
 {
 	struct page *page;
 
+	spin_lock(&init_mm.page_table_lock);
 	spin_lock(&pgd_lock);
 
 	list_for_each_entry(page, &pgd_list, lru) {
@@ -897,6 +898,7 @@ void xen_mm_pin_all(void)
 	}
 
 	spin_unlock(&pgd_lock);
+	spin_unlock(&init_mm.page_table_lock);
 }
 
 static int __init xen_mark_pinned(struct mm_struct *mm, struct page *page,
@@ -1009,6 +1011,7 @@ void xen_mm_unpin_all(void)
 {
 	struct page *page;
 
+	spin_lock(&init_mm.page_table_lock);
 	spin_lock(&pgd_lock);
 
 	list_for_each_entry(page, &pgd_list, lru) {
@@ -1020,6 +1023,7 @@ void xen_mm_unpin_all(void)
 	}
 
 	spin_unlock(&pgd_lock);
+	spin_unlock(&init_mm.page_table_lock);
 }
 
 static void xen_activate_mm(struct mm_struct *prev, struct mm_struct *next)