1 files changed, 31 insertions, 0 deletions

diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
index 0ceac06a0299..13a0b528c70b 100644
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -133,6 +133,37 @@ static int kdump_csum_valid(struct kimage *image)
 }
 
 /*
+ * Map or unmap crashkernel memory
+ */
+static void crash_map_pages(int enable)
+{
+        unsigned long size = resource_size(&crashk_res);
+
+        BUG_ON(crashk_res.start % KEXEC_CRASH_MEM_ALIGN ||
+               size % KEXEC_CRASH_MEM_ALIGN);
+        if (enable)
+                vmem_add_mapping(crashk_res.start, size);
+        else
+                vmem_remove_mapping(crashk_res.start, size);
+}
+
+/*
+ * Map crashkernel memory
+ */
+void crash_map_reserved_pages(void)
+{
+        crash_map_pages(1);
+}
+
+/*
+ * Unmap crashkernel memory
+ */
+void crash_unmap_reserved_pages(void)
+{
+        crash_map_pages(0);
+}
+
+/*
  * Give back memory to hypervisor before new kdump is loaded
  */
 static int machine_kexec_prepare_kdump(void)