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>

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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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168

arch/s390/kvm/gaccess.c

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2

arch/s390/kvm/gaccess.h

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