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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 <amit.shah@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Amit Shah 2010-01-20 00:36:58 +05:30 committed by Anthony Liguori
parent 4d3053a3c6
commit a1829205a5
1 changed files with 4 additions and 0 deletions
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4
hw/virtio-pci.c
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@ -499,10 +499,13 @@ static int virtio_serial_init_pci(PCIDevice *pci_dev)
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 @@ static PCIDeviceInfo virtio_info[] = {
.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,