Each s390 CPU has lowcore pages associated with it. Each CPU sees its
own lowcore at virtual address 0 through a hardware mechanism called
prefixing. Additionally, all lowcores are mapped to non-0 virtual
addresses stored in the lowcore_ptr[] array.

When lowcore is accessed through virtual address 0, one needs to
resolve metadata for lowcore_ptr[raw_smp_processor_id()].

Expose kmsan_get_metadata() to make it possible to do this from the
arch code.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 include/linux/kmsan.h      | 14 ++++++++++++++
 mm/kmsan/instrumentation.c |  1 +
 mm/kmsan/kmsan.h           |  1 -
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/include/linux/kmsan.h b/include/linux/kmsan.h
index e0c23a32cdf0..ff8fd95733fa 100644
--- a/include/linux/kmsan.h
+++ b/include/linux/kmsan.h
@@ -230,6 +230,15 @@ void kmsan_handle_urb(const struct urb *urb, bool is_out);
  */
 void kmsan_unpoison_entry_regs(const struct pt_regs *regs);
 
+/**
+ * kmsan_get_metadata() - Return a pointer to KMSAN shadow or origins.
+ * @addr:      kernel address.
+ * @is_origin: whether to return origins or shadow.
+ *
+ * Return NULL if metadata cannot be found.
+ */
+void *kmsan_get_metadata(void *addr, bool is_origin);
+
 #else
 
 static inline void kmsan_init_shadow(void)
@@ -329,6 +338,11 @@ static inline void kmsan_unpoison_entry_regs(const struct pt_regs *regs)
 {
 }
 
+static inline void *kmsan_get_metadata(void *addr, bool is_origin)
+{
+	return NULL;
+}
+
 #endif
 
 #endif /* _LINUX_KMSAN_H */
diff --git a/mm/kmsan/instrumentation.c b/mm/kmsan/instrumentation.c
index 8a1bbbc723ab..94b49fac9d8b 100644
--- a/mm/kmsan/instrumentation.c
+++ b/mm/kmsan/instrumentation.c
@@ -14,6 +14,7 @@
 
 #include "kmsan.h"
 #include <linux/gfp.h>
+#include <linux/kmsan.h>
 #include <linux/kmsan_string.h>
 #include <linux/mm.h>
 #include <linux/uaccess.h>
diff --git a/mm/kmsan/kmsan.h b/mm/kmsan/kmsan.h
index adf443bcffe8..34b83c301d57 100644
--- a/mm/kmsan/kmsan.h
+++ b/mm/kmsan/kmsan.h
@@ -66,7 +66,6 @@ struct shadow_origin_ptr {
 
 struct shadow_origin_ptr kmsan_get_shadow_origin_ptr(void *addr, u64 size,
 						     bool store);
-void *kmsan_get_metadata(void *addr, bool is_origin);
 void __init kmsan_init_alloc_meta_for_range(void *start, void *end);
 
 enum kmsan_bug_reason {
-- 
2.41.0

> +static inline void *kmsan_get_metadata(void *addr, bool is_origin)
> +{
> +       return NULL;
> +}
> +
>  #endif

We shouldn't need this part, as kmsan_get_metadata() should never be
called in non-KMSAN builds.