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virtio-serial: Enable ioeventfd

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Enable ioeventfd for virtio-serial devices by default.  Commit
25db9ebe15 lists the benefits of using
ioeventfd.

Copying a file from guest to host over a virtio-serial channel didn't
show much difference in time or io_exit rate.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Amit Shah 2011-02-17 12:31:10 +05:30
parent 0b8b716d6c
commit 32059220d0
1 changed files with 3 additions and 0 deletions
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3
hw/virtio-pci.c
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@ -789,6 +789,7 @@ static int virtio_serial_exit_pci(PCIDevice *pci_dev)
{
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
virtio_pci_stop_ioeventfd(proxy);
virtio_serial_exit(proxy->vdev);
return virtio_exit_pci(pci_dev);
}
@ -898,6 +899,8 @@ static PCIDeviceInfo virtio_info[] = {
.init = virtio_serial_init_pci,
.exit = virtio_serial_exit_pci,
.qdev.props = (Property[]) {
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
DEV_NVECTORS_UNSPECIFIED),
DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),