KVM: s390: Send program check on access error

If the guest accesses non-existing memory, the sie64a function returns
-EFAULT. We must check the return value and send a program check to the
guest if the sie instruction faulted, otherwise the guest will loop at
the faulting code.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index ded27c7..6558b09 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -443,7 +443,10 @@ static void __vcpu_run(struct kvm_vcpu *vcpu)
        local_irq_enable();
        VCPU_EVENT(vcpu, 6, "entering sie flags %x",
                   atomic_read(&vcpu->arch.sie_block->cpuflags));
-       sie64a(vcpu->arch.sie_block, vcpu->arch.guest_gprs);
+       if (sie64a(vcpu->arch.sie_block, vcpu->arch.guest_gprs)) {
+               VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
+               kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+       }
        VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
                   vcpu->arch.sie_block->icptcode);
        local_irq_disable();