KVM: s390: Return error on SIDA memop on normal guest

commit 2c212e1baedcd782b2535a3f86bc491977677c0e upstream.

Refuse SIDA memops on guests which are not protected.
For normal guests, the secure instruction data address designation,
which determines the location we access, is not under control of KVM.

Fixes: 19e122776886 (KVM: S390: protvirt: Introduce instruction data area bounce buffer)
Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 24e42bd..9a8c086 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -4708,6 +4708,8 @@ static long kvm_s390_guest_sida_op(struct kvm_vcpu *vcpu,
                return -EINVAL;
        if (mop->size + mop->sida_offset > sida_size(vcpu->arch.sie_block))
                return -E2BIG;
+       if (!kvm_s390_pv_cpu_is_protected(vcpu))
+               return -EINVAL;
 
        switch (mop->op) {
        case KVM_S390_MEMOP_SIDA_READ: