[PATCH v4 3/7] KVM: s390: Do not set special large pages dirty

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

Special pages / folios should not be set dirty. This also applies to
large pages.

Add a missing check in gmap_clear_young_crste() to prevent setting the
large page dirty if it is a special page.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Fixes: a2c17f9270cc ("KVM: s390: New gmap code")
---
 arch/s390/kvm/gmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/kvm/gmap.c b/arch/s390/kvm/gmap.c
index 52d55ddea8d4..3192f610f696 100644
--- a/arch/s390/kvm/gmap.c
+++ b/arch/s390/kvm/gmap.c
@@ -327,7 +327,7 @@ static long gmap_clear_young_crste(union crste *crstep, gfn_t gfn, gfn_t end, st
 		new.h.i = 1;
 		new.s.fc1.y = 0;
 		new.s.fc1.prefix_notif = 0;
-		if (new.s.fc1.d || !new.h.p)
+		if ((new.s.fc1.d || !new.h.p) && !new.s.fc1.s)
 			folio_set_dirty(phys_to_folio(crste_origin_large(crste)));
 		new.s.fc1.d = 0;
 		new.h.p = 1;
-- 
2.54.0