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Janosch Frank 0a3df0418d KVM: s390: Disable dirty log retrieval for UCONTROL guests

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2017-03-15 09:57:11 +08:00

diag.c

KVM: s390: add more debug data for the pfault diagnoses

2015-07-29 11:02:34 +02:00

gaccess.c

KVM: s390: Add MEMOP ioctls for reading/writing guest memory

2015-03-17 16:26:24 +01:00

gaccess.h

KVM: s390: Add MEMOP ioctls for reading/writing guest memory

2015-03-17 16:26:24 +01:00

guestdbg.c

KVM: s390: filter space-switch events when PER is enforced