+static int assigned_device_update_intx(struct kvm *kvm,
+ struct kvm_assigned_dev_kernel *adev,
+ struct kvm_assigned_irq *airq)
+{
+ adev->guest_irq = airq->guest_irq;
+ adev->ack_notifier.gsi = airq->guest_irq;
+
+ if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_INTX)
+ return 0;
+
+ if (irqchip_in_kernel(kvm)) {
+ if (!msi2intx &&
+ (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)) {
+ free_irq(adev->host_irq, (void *)adev);
+ pci_disable_msi(adev->dev);
+ }
+
+ if (!capable(CAP_SYS_RAWIO))
+ return -EPERM;
+
+ if (airq->host_irq)
+ adev->host_irq = airq->host_irq;
+ else
+ adev->host_irq = adev->dev->irq;
+
+ /* Even though this is PCI, we don't want to use shared
+ * interrupts. Sharing host devices with guest-assigned devices
+ * on the same interrupt line is not a happy situation: there
+ * are going to be long delays in accepting, acking, etc.
+ */
+ if (request_irq(adev->host_irq, kvm_assigned_dev_intr,
+ 0, "kvm_assigned_intx_device", (void *)adev))
+ return -EIO;
+ }
+
+ adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_INTX |
+ KVM_ASSIGNED_DEV_HOST_INTX;
+ return 0;
+}
+
+#ifdef CONFIG_X86
+static int assigned_device_update_msi(struct kvm *kvm,
+ struct kvm_assigned_dev_kernel *adev,
+ struct kvm_assigned_irq *airq)
+{
+ int r;
+
+ adev->guest_irq = airq->guest_irq;
+ if (airq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI) {
+ /* x86 don't care upper address of guest msi message addr */
+ adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_MSI;
+ adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_INTX;
+ adev->ack_notifier.gsi = -1;
+ } else if (msi2intx) {
+ adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_INTX;
+ adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_MSI;
+ adev->ack_notifier.gsi = airq->guest_irq;
+ } else {
+ /*
+ * Guest require to disable device MSI, we disable MSI and
+ * re-enable INTx by default again. Notice it's only for
+ * non-msi2intx.
+ */
+ assigned_device_update_intx(kvm, adev, airq);
+ return 0;
+ }
+
+ if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)
+ return 0;
+
+ if (irqchip_in_kernel(kvm)) {
+ if (!msi2intx) {
+ if (adev->irq_requested_type &
+ KVM_ASSIGNED_DEV_HOST_INTX)
+ free_irq(adev->host_irq, (void *)adev);
+
+ r = pci_enable_msi(adev->dev);
+ if (r)
+ return r;
+ }
+
+ adev->host_irq = adev->dev->irq;
+ if (request_irq(adev->host_irq, kvm_assigned_dev_intr, 0,
+ "kvm_assigned_msi_device", (void *)adev))
+ return -EIO;
+ }
+
+ if (!msi2intx)
+ adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_MSI;
+
+ adev->irq_requested_type |= KVM_ASSIGNED_DEV_HOST_MSI;
+ return 0;
+}
+#endif
+