From 43fa8533e10c478825952d489269d55e5c652c1a Mon Sep 17 00:00:00 2001

From: Amit Shah <amit.shah@redhat.com>

Date: Wed, 20 Jan 2010 00:36:58 +0530

Subject: [PATCH 8/9] 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>

---

 hw/virtio-pci.c |    4 ++++

 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c

index c1a1e4c..4451a63 100644

--- a/hw/virtio-pci.c

+++ b/hw/virtio-pci.c

@@ -497,10 +497,13 @@ 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;

 }

@@ -577,6 +580,7 @@ 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_PROP_UINT32("max_ports", VirtIOPCIProxy, max_virtserial_ports,

                                31),

-- 

1.6.2.5