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, 3 insertions, 3 deletions

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index e9eaa4281d94..0fd5a9c7e901 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1167,7 +1167,7 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 	res = ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID));
 	/* At this point the reference through the mapping is still present */
 	if (mm_is_protected(mm) && pte_present(res))
-		uv_convert_owned_from_secure(pte_val(res) & PAGE_MASK);
+		uv_convert_from_secure_pte(res);
 	return res;
 }
 
@@ -1185,7 +1185,7 @@ static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
 	res = ptep_xchg_direct(vma->vm_mm, addr, ptep, __pte(_PAGE_INVALID));
 	/* At this point the reference through the mapping is still present */
 	if (mm_is_protected(vma->vm_mm) && pte_present(res))
-		uv_convert_owned_from_secure(pte_val(res) & PAGE_MASK);
+		uv_convert_from_secure_pte(res);
 	return res;
 }
 
@@ -1224,7 +1224,7 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
 	 * if this is not a mm teardown, the slower export is used as
 	 * fallback instead.
 	 */
-	uv_convert_owned_from_secure(pte_val(res) & PAGE_MASK);
+	uv_convert_from_secure_pte(res);
 	return res;
 }