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From 43fa8533e10c478825952d489269d55e5c652c1a Mon Sep 17 00:00:00 2001
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From: Amit Shah <amit.shah@redhat.com>
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Date: Wed, 20 Jan 2010 00:36:58 +0530
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Subject: [PATCH 8/9] virtio-serial: Use MSI vectors for port virtqueues
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This commit enables the use of MSI interrupts for virtqueue
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notifications for ports. We use nr_ports + 1 (for control channel) msi
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entries for the ports, as only the in_vq operations need an interrupt on
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the guest.
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Signed-off-by: Amit Shah <amit.shah@redhat.com>
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Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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---
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hw/virtio-pci.c | 4 ++++
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1 files changed, 4 insertions(+), 0 deletions(-)
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diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
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index c1a1e4c..4451a63 100644
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--- a/hw/virtio-pci.c
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+++ b/hw/virtio-pci.c
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@@ -497,10 +497,13 @@ static int virtio_serial_init_pci(PCIDevice *pci_dev)
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if (!vdev) {
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return -1;
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}
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+ vdev->nvectors = proxy->nvectors ? proxy->nvectors
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+ : proxy->max_virtserial_ports + 1;
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virtio_init_pci(proxy, vdev,
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PCI_VENDOR_ID_REDHAT_QUMRANET,
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PCI_DEVICE_ID_VIRTIO_CONSOLE,
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proxy->class_code, 0x00);
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+ proxy->nvectors = vdev->nvectors;
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return 0;
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}
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@@ -577,6 +580,7 @@ static PCIDeviceInfo virtio_info[] = {
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.init = virtio_serial_init_pci,
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.exit = virtio_exit_pci,
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.qdev.props = (Property[]) {
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+ DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 0),
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DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
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DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy, max_virtserial_ports,
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31),
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--
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1.6.2.5
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