+#ifdef CONFIG_PPC_BOOK3S_64
+
+static void kvmppc_trigger_fac_interrupt(struct kvm_vcpu *vcpu, ulong fac)
+{
+ /* Inject the Interrupt Cause field and trigger a guest interrupt */
+ vcpu->arch.fscr &= ~(0xffULL << 56);
+ vcpu->arch.fscr |= (fac << 56);
+ kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_FAC_UNAVAIL);
+}
+
+static void kvmppc_emulate_fac(struct kvm_vcpu *vcpu, ulong fac)
+{
+ enum emulation_result er = EMULATE_FAIL;
+
+ if (!(kvmppc_get_msr(vcpu) & MSR_PR))
+ er = kvmppc_emulate_instruction(vcpu->run, vcpu);
+
+ if ((er != EMULATE_DONE) && (er != EMULATE_AGAIN)) {
+ /* Couldn't emulate, trigger interrupt in guest */
+ kvmppc_trigger_fac_interrupt(vcpu, fac);
+ }
+}
+
+/* Enable facilities (TAR, EBB, DSCR) for the guest */
+static int kvmppc_handle_fac(struct kvm_vcpu *vcpu, ulong fac)
+{
+ bool guest_fac_enabled;
+ BUG_ON(!cpu_has_feature(CPU_FTR_ARCH_207S));
+
+ /*
+ * Not every facility is enabled by FSCR bits, check whether the
+ * guest has this facility enabled at all.
+ */
+ switch (fac) {
+ case FSCR_TAR_LG:
+ case FSCR_EBB_LG:
+ guest_fac_enabled = (vcpu->arch.fscr & (1ULL << fac));
+ break;
+ case FSCR_TM_LG:
+ guest_fac_enabled = kvmppc_get_msr(vcpu) & MSR_TM;
+ break;
+ default:
+ guest_fac_enabled = false;
+ break;
+ }
+
+ if (!guest_fac_enabled) {
+ /* Facility not enabled by the guest */
+ kvmppc_trigger_fac_interrupt(vcpu, fac);
+ return RESUME_GUEST;
+ }
+
+ switch (fac) {
+ case FSCR_TAR_LG:
+ /* TAR switching isn't lazy in Linux yet */
+ current->thread.tar = mfspr(SPRN_TAR);
+ mtspr(SPRN_TAR, vcpu->arch.tar);
+ vcpu->arch.shadow_fscr |= FSCR_TAR;
+ break;
+ default:
+ kvmppc_emulate_fac(vcpu, fac);
+ break;
+ }
+
+ return RESUME_GUEST;
+}
+#endif
+