linux-kernel - [PATCH v6 07/28] KVM: s390: Export two functions

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Message-ID: <20251222165033.162329-8-imbrenda@linux.ibm.com>
Date: Mon, 22 Dec 2025 17:50:12 +0100
From: Claudio Imbrenda <imbrenda@...ux.ibm.com>
To: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        borntraeger@...ibm.com, frankja@...ux.ibm.com, nsg@...ux.ibm.com,
        nrb@...ux.ibm.com, seiden@...ux.ibm.com, gra@...ux.ibm.com,
        schlameuss@...ux.ibm.com, hca@...ux.ibm.com, svens@...ux.ibm.com,
        agordeev@...ux.ibm.com, gor@...ux.ibm.com, david@...hat.com,
        gerald.schaefer@...ux.ibm.com
Subject: [PATCH v6 07/28] KVM: s390: Export two functions

Export __make_folio_secure() and s390_wiggle_split_folio(), as they will
be needed to be used by KVM.

Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
---
 arch/s390/include/asm/uv.h | 2 ++
 arch/s390/kernel/uv.c      | 6 ++++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
index 8018549a1ad2..0744874ca6df 100644
--- a/arch/s390/include/asm/uv.h
+++ b/arch/s390/include/asm/uv.h
@@ -632,6 +632,8 @@ int uv_destroy_folio(struct folio *folio);
 int uv_destroy_pte(pte_t pte);
 int uv_convert_from_secure_pte(pte_t pte);
 int make_hva_secure(struct mm_struct *mm, unsigned long hva, struct uv_cb_header *uvcb);
+int s390_wiggle_split_folio(struct mm_struct *mm, struct folio *folio);
+int __make_folio_secure(struct folio *folio, struct uv_cb_header *uvcb);
 int uv_convert_from_secure(unsigned long paddr);
 int uv_convert_from_secure_folio(struct folio *folio);
 
diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
index ca0849008c0d..cb4e8089fbca 100644
--- a/arch/s390/kernel/uv.c
+++ b/arch/s390/kernel/uv.c
@@ -281,7 +281,7 @@ static int expected_folio_refs(struct folio *folio)
  *          (it's the same logic as split_folio()), and the folio must be
  *          locked.
  */
-static int __make_folio_secure(struct folio *folio, struct uv_cb_header *uvcb)
+int __make_folio_secure(struct folio *folio, struct uv_cb_header *uvcb)
 {
 	int expected, cc = 0;
 
@@ -311,6 +311,7 @@ static int __make_folio_secure(struct folio *folio, struct uv_cb_header *uvcb)
 		return -EAGAIN;
 	return uvcb->rc == 0x10a ? -ENXIO : -EINVAL;
 }
+EXPORT_SYMBOL(__make_folio_secure);
 
 static int make_folio_secure(struct mm_struct *mm, struct folio *folio, struct uv_cb_header *uvcb)
 {
@@ -339,7 +340,7 @@ static int make_folio_secure(struct mm_struct *mm, struct folio *folio, struct u
  *		   but another attempt can be made;
  *	   -EINVAL in case of other folio splitting errors. See split_folio().
  */
-static int s390_wiggle_split_folio(struct mm_struct *mm, struct folio *folio)
+int s390_wiggle_split_folio(struct mm_struct *mm, struct folio *folio)
 {
 	int rc, tried_splits;
 
@@ -411,6 +412,7 @@ static int s390_wiggle_split_folio(struct mm_struct *mm, struct folio *folio)
 	}
 	return -EAGAIN;
 }
+EXPORT_SYMBOL_GPL(s390_wiggle_split_folio);
 
 int make_hva_secure(struct mm_struct *mm, unsigned long hva, struct uv_cb_header *uvcb)
 {
-- 
2.52.0