[PATCH v6 03/28] s390: Make UV folio operations work on whole folio

[Claudio Imbrenda <imbrenda@linux.ibm.com>]

uv_destroy_folio() and uv_convert_from_secure_folio() should work on
all pages in the folio, not just the first one.

This was fine until now, but it will become a problem with upcoming
patches.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
 arch/s390/kernel/uv.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
index ed46950be86f..ca0849008c0d 100644
--- a/arch/s390/kernel/uv.c
+++ b/arch/s390/kernel/uv.c
@@ -134,14 +134,15 @@ static int uv_destroy(unsigned long paddr)
  */
 int uv_destroy_folio(struct folio *folio)
 {
+	unsigned long i;
 	int rc;
 
-	/* Large folios cannot be secure */
-	if (unlikely(folio_test_large(folio)))
-		return 0;
-
 	folio_get(folio);
-	rc = uv_destroy(folio_to_phys(folio));
+	for (i = 0; i < (1 << folio_order(folio)); i++) {
+		rc = uv_destroy(folio_to_phys(folio) + i * PAGE_SIZE);
+		if (rc)
+			break;
+	}
 	if (!rc)
 		clear_bit(PG_arch_1, &folio->flags.f);
 	folio_put(folio);
@@ -183,14 +184,15 @@ EXPORT_SYMBOL_GPL(uv_convert_from_secure);
  */
 int uv_convert_from_secure_folio(struct folio *folio)
 {
+	unsigned long i;
 	int rc;
 
-	/* Large folios cannot be secure */
-	if (unlikely(folio_test_large(folio)))
-		return 0;
-
 	folio_get(folio);
-	rc = uv_convert_from_secure(folio_to_phys(folio));
+	for (i = 0; i < (1 << folio_order(folio)); i++) {
+		rc = uv_convert_from_secure(folio_to_phys(folio) + i * PAGE_SIZE);
+		if (rc)
+			break;
+	}
 	if (!rc)
 		clear_bit(PG_arch_1, &folio->flags.f);
 	folio_put(folio);
-- 
2.52.0