virtio-serial: Use MSI vectors for port virtqueues
This commit enables the use of MSI interrupts for virtqueue
notifications for ports. We use nr_ports + 1 (for control channel) msi
entries for the ports, as only the in_vq operations need an interrupt on
the guest.
Signed-off-by: Amit Shah <[email protected]>
Signed-off-by: Anthony Liguori <[email protected]>
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index e7fabfb..709d13e 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -499,10 +499,13 @@
if (!vdev) {
return -1;
}
+ vdev->nvectors = proxy->nvectors ? proxy->nvectors
+ : proxy->max_virtserial_ports + 1;
virtio_init_pci(proxy, vdev,
PCI_VENDOR_ID_REDHAT_QUMRANET,
PCI_DEVICE_ID_VIRTIO_CONSOLE,
proxy->class_code, 0x00);
+ proxy->nvectors = vdev->nvectors;
return 0;
}
@@ -581,6 +584,7 @@
.init = virtio_serial_init_pci,
.exit = virtio_exit_pci,
.qdev.props = (Property[]) {
+ DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 0),
DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy, max_virtserial_ports,
