diff options
Diffstat (limited to 'arch/s390/kvm/intercept.c')
| -rw-r--r-- | arch/s390/kvm/intercept.c | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c index 9d19803111ba..98997ccba501 100644 --- a/arch/s390/kvm/intercept.c +++ b/arch/s390/kvm/intercept.c @@ -154,17 +154,25 @@ static int handle_stop(struct kvm_vcpu *vcpu) static int handle_validity(struct kvm_vcpu *vcpu) { int viwhy = vcpu->arch.sie_block->ipb >> 16; + int rc; + vcpu->stat.exit_validity++; - if (viwhy == 0x37) { - fault_in_pages_writeable((char __user *) - vcpu->kvm->arch.guest_origin + - vcpu->arch.sie_block->prefix, - PAGE_SIZE); - return 0; - } - VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d", - viwhy); - return -ENOTSUPP; + if ((viwhy == 0x37) && (vcpu->arch.sie_block->prefix + <= vcpu->kvm->arch.guest_memsize - 2*PAGE_SIZE)){ + rc = fault_in_pages_writeable((char __user *) + vcpu->kvm->arch.guest_origin + + vcpu->arch.sie_block->prefix, + 2*PAGE_SIZE); + if (rc) + /* user will receive sigsegv, exit to user */ + rc = -ENOTSUPP; + } else + rc = -ENOTSUPP; + + if (rc) + VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d", + viwhy); + return rc; } static int handle_instruction(struct kvm_vcpu *vcpu) |