KVM: s390x: implement KVM_CAP_SET_GUEST_DEBUG2

Define KVM_GUESTDBG_VALID_MASK and use it to implement this capabiity.
Compile tested only.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210401135451.1004564-6-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 0af3e03..8925f39 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -701,6 +701,10 @@ struct kvm_hw_bp_info_arch {
 #define guestdbg_exit_pending(vcpu) (guestdbg_enabled(vcpu) && \
 		(vcpu->guest_debug & KVM_GUESTDBG_EXIT_PENDING))
 
+#define KVM_GUESTDBG_VALID_MASK \
+		(KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP |\
+		KVM_GUESTDBG_USE_HW_BP | KVM_GUESTDBG_EXIT_PENDING)
+
 struct kvm_guestdbg_info_arch {
 	unsigned long cr0;
 	unsigned long cr9;