From 00fc062d5364174b94e3b5780c22e95c0fb4b60a Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Mon, 18 Apr 2016 17:19:59 +0200 Subject: [PATCH] s390/mm: push ste protection down to shadow pte If a guest ste is read-only, it doesn't make sense to force the ptes in as writable in the host. If the source page is read-only in the host, it won't have to be made writable. Please note that if the source page is not available, it will still be faulted in writable. This can be changed internally later on. If ste protection is removed, underlying shadow tables are also removed, therefore this change does not affect the guest. Acked-by: Martin Schwidefsky Signed-off-by: David Hildenbrand Signed-off-by: Christian Borntraeger --- arch/s390/kvm/gaccess.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c index e70f916c1079..a85bc6c6a098 100644 --- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -1111,6 +1111,7 @@ int kvm_s390_shadow_fault(struct kvm_vcpu *vcpu, struct gmap *sg, rc = PGM_PAGE_TRANSLATION; if (!rc && (pte.z || pte.co)) rc = PGM_TRANSLATION_SPEC; + pte.p |= dat_protection; if (!rc) rc = gmap_shadow_page(sg, saddr, __pte(pte.val)); ipte_unlock(vcpu); -- GitLab