diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2012-12-20 14:28:58 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2013-01-07 19:42:22 +0200 |
| commit | 2d620f593d9395abd9aa453f8ae0861a51d674d8 (patch) | |
| tree | d3cab64b07a957ce4334b1a3ad5f1ba1a08c95d4 /hw/virtio-pci.c | |
| parent | 8e4a424b305e29dc0e454f52df3b35577f342975 (diff) | |
virtio: don't waste irqfds on control vqs
Pass nvqs to set_guest_notifiers. This makes it possible to
save on irqfds by not allocating one for the control vq
for virtio-net.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/virtio-pci.c')
| -rw-r--r-- | hw/virtio-pci.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c index c7f0c4d4ed..65a563bdb2 100644 --- a/hw/virtio-pci.c +++ b/hw/virtio-pci.c @@ -535,7 +535,7 @@ static int kvm_virtio_pci_vector_use(PCIDevice *dev, unsigned vector, VirtIODevice *vdev = proxy->vdev; int ret, queue_no; - for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) { + for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) { if (!virtio_queue_get_num(vdev, queue_no)) { break; } @@ -565,7 +565,7 @@ static void kvm_virtio_pci_vector_release(PCIDevice *dev, unsigned vector) VirtIODevice *vdev = proxy->vdev; int queue_no; - for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) { + for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) { if (!virtio_queue_get_num(vdev, queue_no)) { break; } @@ -587,7 +587,7 @@ static void kvm_virtio_pci_vector_poll(PCIDevice *dev, EventNotifier *notifier; VirtQueue *vq; - for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) { + for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) { if (!virtio_queue_get_num(vdev, queue_no)) { break; } @@ -631,7 +631,7 @@ static bool virtio_pci_query_guest_notifiers(DeviceState *d) return msix_enabled(&proxy->pci_dev); } -static int virtio_pci_set_guest_notifiers(DeviceState *d, bool assign) +static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign) { VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); VirtIODevice *vdev = proxy->vdev; @@ -639,6 +639,15 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d, bool assign) bool with_irqfd = msix_enabled(&proxy->pci_dev) && kvm_msi_via_irqfd_enabled(); + nvqs = MIN(nvqs, VIRTIO_PCI_QUEUE_MAX); + + /* When deassigning, pass a consistent nvqs value + * to avoid leaking notifiers. + */ + assert(assign || nvqs == proxy->nvqs_with_notifiers); + + proxy->nvqs_with_notifiers = nvqs; + /* Must unset vector notifier while guest notifier is still assigned */ if (proxy->vector_irqfd && !assign) { msix_unset_vector_notifiers(&proxy->pci_dev); @@ -646,7 +655,7 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d, bool assign) proxy->vector_irqfd = NULL; } - for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) { + for (n = 0; n < nvqs; n++) { if (!virtio_queue_get_num(vdev, n)) { break; } |