Following patch adds virtio_update_config() wrapper to trigger an IRQ on
config space updates.
The write callbacks also need to be hooked.
Index: kvm-userspace/qemu/hw/virtio.c
===================================================================
--- kvm-userspace.orig/qemu/hw/virtio.c
+++ kvm-userspace/qemu/hw/virtio.c
@@ -155,7 +156,9 @@ static VirtIODevice *to_virtio_device(PC
static void virtio_update_irq(VirtIODevice *vdev)
{
- qemu_set_irq(vdev->pci_dev.irq[0], vdev->isr & 1);
+ int level = vdev->isr ? 1 : 0;
+
+ qemu_set_irq(vdev->pci_dev.irq[0], level);
}
void virtio_reset(void *opaque)
@@ -387,6 +390,14 @@ void virtio_notify(VirtIODevice *vdev, V
virtio_update_irq(vdev);
}
+void virtio_update_config(VirtIODevice *vdev)
+{
+ vdev->update_config(vdev, vdev->config);
+
+ vdev->isr = VIRTIO_PCI_ISR_CONFIG;
+ virtio_update_irq(vdev);
+}
+
VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name,
uint16_t vendor, uint16_t device,
uint16_t subvendor, uint16_t subdevice,
Index: kvm-userspace/qemu/hw/virtio.h
===================================================================
--- kvm-userspace.orig/qemu/hw/virtio.h
+++ kvm-userspace/qemu/hw/virtio.h
@@ -140,4 +140,6 @@ int virtqueue_pop(VirtQueue *vq, VirtQue
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
+void virtio_update_config(VirtIODevice *vdev);
+
#endif
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