Message ID | 20120313104240.8741.15753.stgit@dhcp-8-167.nay.redhat.com |
---|---|
State | New |
Headers | show |
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c index d63f303..d15b11b 100644 --- a/hw/virtio-pci.c +++ b/hw/virtio-pci.c @@ -322,6 +322,9 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) virtio_set_status(vdev, val & 0xFF); if (val & VIRTIO_CONFIG_S_DRIVER_OK) { + if (kvm_has_many_ioeventfds() == 0) { + proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD; + } virtio_pci_start_ioeventfd(proxy); }
Qemu already supported multiple function devices, pci-bridge would support more pci devices. But iobus dev in kernel are limited. If there is no enough available ioeventfd, then clean VIRTIO_PCI_FLAG_USE_IOEVENTFD bit, virtio-pci would fallback to userspace. Signed-off-by: Amos Kong <akong@redhat.com> --- hw/virtio-pci.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)