hw/vfio: set interrupts using pci irq wrappers

pci_set_irq and the other pci irq wrappers use
PCI_INTERRUPT_PIN config register to compute device
INTx pin to assert/deassert.

save INTX pin into the config register before calling
pci_set_irq
Signed-off-by: NMarcel Apfelbaum <marcel.a@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/misc/vfio.c

@@ -297,7 +297,7 @@ static void vfio_intx_interrupt(void *opaque)
             'A' + vdev->intx.pin);
 
     vdev->intx.pending = true;
-    qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 1);
+    pci_irq_assert(&vdev->pdev);
     vfio_mmap_set_enabled(vdev, false);
     if (vdev->intx.mmap_timeout) {
         timer_mod(vdev->intx.mmap_timer,
@@ -315,7 +315,7 @@ static void vfio_eoi(VFIODevice *vdev)
             vdev->host.bus, vdev->host.slot, vdev->host.function);
 
     vdev->intx.pending = false;
-    qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 0);
+    pci_irq_deassert(&vdev->pdev);
     vfio_unmask_intx(vdev);
 }
 
@@ -341,7 +341,7 @@ static void vfio_enable_intx_kvm(VFIODevice *vdev)
     qemu_set_fd_handler(irqfd.fd, NULL, NULL, vdev);
     vfio_mask_intx(vdev);
     vdev->intx.pending = false;
-    qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 0);
+    pci_irq_deassert(&vdev->pdev);
 
     /* Get an eventfd for resample/unmask */
     if (event_notifier_init(&vdev->intx.unmask, 0)) {
@@ -417,7 +417,7 @@ static void vfio_disable_intx_kvm(VFIODevice *vdev)
      */
     vfio_mask_intx(vdev);
     vdev->intx.pending = false;
-    qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 0);
+    pci_irq_deassert(&vdev->pdev);
 
     /* Tell KVM to stop listening for an INTx irqfd */
     if (kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd)) {
@@ -488,6 +488,7 @@ static int vfio_enable_intx(VFIODevice *vdev)
     vfio_disable_interrupts(vdev);
 
     vdev->intx.pin = pin - 1; /* Pin A (1) -> irq[0] */
+    pci_config_set_interrupt_pin(vdev->pdev.config, pin);
 
 #ifdef CONFIG_KVM
     /*
@@ -547,7 +548,7 @@ static void vfio_disable_intx(VFIODevice *vdev)
     vfio_disable_intx_kvm(vdev);
     vfio_disable_irqindex(vdev, VFIO_PCI_INTX_IRQ_INDEX);
     vdev->intx.pending = false;
-    qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 0);
+    pci_irq_deassert(&vdev->pdev);
     vfio_mmap_set_enabled(vdev, true);
 
     fd = event_notifier_get_fd(&vdev->intx.interrupt);