KVM: s390: Disable dirty log retrieval for UCONTROL guests

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commit e1e8a9624f upstream.

User controlled KVM guests do not support the dirty log, as they have
no single gmap that we can check for changes.

As they have no single gmap, kvm->arch.gmap is NULL and all further
referencing to it for dirty checking will result in a NULL
dereference.

Let's return -EINVAL if a caller tries to sync dirty logs for a
UCONTROL guest.

Fixes: 15f36eb ("KVM: s390: Add proper dirty bitmap support to S390 kvm.")

Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reported-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Janosch Frank 2017-02-02 16:39:31 +01:00 • committed by Ben Hutchings

parent 9279ffd668

commit ddadbae79c

1 changed files with 3 additions and 0 deletions

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arch/s390/kvm/kvm-s390.c

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