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s390/mm: add kvm shadow fault function

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This patch introduces function kvm_s390_shadow_fault() used to resolve a
fault on a shadow gmap. This function will do validity checking and
build up the shadow page table hierarchy in order to fault in the
requested page into the shadow page table structure.

If an exception occurs while shadowing, guest 2 has to be notified about
it using either an exception or a program interrupt intercept. If
concurrent unshadowing occurres, this function will simply return with
-EAGAIN and the caller has to retry.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2016-03-08 12:16:35 +01:00
committed by Christian Borntraeger
parent 4be130a084
commit aa17aa57cf
2 changed files with 170 additions and 0 deletions
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2
arch/s390/kvm/gaccess.h
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@@ -361,4 +361,6 @@ void ipte_unlock(struct kvm_vcpu *vcpu);
int ipte_lock_held(struct kvm_vcpu *vcpu);
int kvm_s390_check_low_addr_prot_real(struct kvm_vcpu *vcpu, unsigned long gra);
int kvm_s390_shadow_fault(struct gmap *shadow, unsigned long saddr, int write);
#endif /* __KVM_S390_GACCESS_H */