Commit 00fc062d authored Apr 18, 2016 by David Hildenbrand Committed by Christian Borntraeger Jun 20, 2016

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 <schwidefsky@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

parent f4debb40

arch/s390/kvm/gaccess.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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);

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