KVM: s390: guestdbg: signal missing hardware support

Without guest-PER enhancement, we can't provide any debugging support.
Therefore act like kernel support is missing.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index efb902cdd1d24bc99b43b27cf4694911c6cb96b4..e477c8e5b5c1764872fd25d7a1521dd6e2754003 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2179,6 +2179,8 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 
        if (dbg->control & ~VALID_GUESTDBG_FLAGS)
                return -EINVAL;
+       if (!sclp.has_gpere)
+               return -EINVAL;
 
        if (dbg->control & KVM_GUESTDBG_ENABLE) {
                vcpu->guest_debug = dbg->control;