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

Claudio Imbrenda
2025-12-22T16:50:51Z

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@linux.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