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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>
This commit is contained in:
David Hildenbrand 2016-04-18 17:19:59 +02:00 committed by Christian Borntraeger
parent f4debb4090
commit 00fc062d53
1 changed files with 1 additions and 0 deletions
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arch/s390/kvm/gaccess.c
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@ -1111,6 +1111,7 @@ int kvm_s390_shadow_fault(struct kvm_vcpu *vcpu, struct gmap *sg,
rc = PGM_PAGE_TRANSLATION; rc = PGM_PAGE_TRANSLATION;
if (!rc && (pte.z || pte.co)) if (!rc && (pte.z || pte.co))
rc = PGM_TRANSLATION_SPEC; rc = PGM_TRANSLATION_SPEC;
pte.p |= dat_protection;
if (!rc) if (!rc)
rc = gmap_shadow_page(sg, saddr, __pte(pte.val)); rc = gmap_shadow_page(sg, saddr, __pte(pte.val));
ipte_unlock(vcpu); ipte_unlock(vcpu);