diff mbox

[GIT,PULL,14/51] s390/mm: push ste protection down to shadow pte

Message ID 1466514809-146638-15-git-send-email-borntraeger@de.ibm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Christian Borntraeger June 21, 2016, 1:12 p.m. UTC 
From: David Hildenbrand <dahi@linux.vnet.ibm.com>

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 <schwidefsky@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
 arch/s390/kvm/gaccess.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox

Patch

diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c
index e70f916..a85bc6c 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);