s390/uv: Convert uv_convert_owned_from_secure() to uv_convert_from_secure_(folio|pte)()

Let's do the same as we did for uv_destroy_(folio|pte)() and
have the following variants:

(1) uv_convert_from_secure(): "low level" helper that operates on paddr
and does not mess with folios.

(2) uv_convert_from_secure_folio(): Consumes a folio to which we hold a
reference.

(3) uv_convert_from_secure_pte(): Consumes a PTE that holds a reference
through the mapping.

Unfortunately we need uv_convert_from_secure_pte(), because pfn_folio()
and friends are not available in pgtable.h.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20240508182955.358628-9-david@redhat.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

1 files changed, 13 insertions, 5 deletions

diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
index 61c1ce51c883..b456066d72da 100644
--- a/arch/s390/kernel/uv.c
+++ b/arch/s390/kernel/uv.c
@@ -178,11 +178,10 @@ static int uv_convert_from_secure(unsigned long paddr)
 }
 
 /*
- * The caller must already hold a reference to the page
+ * The caller must already hold a reference to the folio.
  */
-int uv_convert_owned_from_secure(unsigned long paddr)
+static int uv_convert_from_secure_folio(struct folio *folio)
 {
-	struct folio *folio = phys_to_folio(paddr);
 	int rc;
 
 	/* See gmap_make_secure(): large folios cannot be secure */
@@ -190,7 +189,7 @@ int uv_convert_owned_from_secure(unsigned long paddr)
 		return 0;
 
 	folio_get(folio);
-	rc = uv_convert_from_secure(paddr);
+	rc = uv_convert_from_secure(folio_to_phys(folio));
 	if (!rc)
 		clear_bit(PG_arch_1, &folio->flags);
 	folio_put(folio);
@@ -198,6 +197,15 @@ int uv_convert_owned_from_secure(unsigned long paddr)
 }
 
 /*
+ * The present PTE still indirectly holds a folio reference through the mapping.
+ */
+int uv_convert_from_secure_pte(pte_t pte)
+{
+	VM_WARN_ON(!pte_present(pte));
+	return uv_convert_from_secure_folio(pfn_folio(pte_pfn(pte)));
+}
+
+/*
  * Calculate the expected ref_count for a folio that would otherwise have no
  * further pins. This was cribbed from similar functions in other places in
  * the kernel, but with some slight modifications. We know that a secure
@@ -481,7 +489,7 @@ int gmap_destroy_page(struct gmap *gmap, unsigned long gaddr)
 	 * we instead try to export the page.
 	 */
 	if (rc)
-		rc = uv_convert_owned_from_secure(page_to_phys(page));
+		rc = uv_convert_from_secure_folio(folio);
 	folio_put(folio);
 out:
 	mmap_read_unlock(gmap->mm);