On Tue, Apr 27, 2021 at 3:12 PM Jason Wang <jasow...@redhat.com> wrote:
>
>
> 在 2021/4/27 上午11:39, Cindy Lu 写道:
> > Add support for configure interrupt, use kvm_irqfd_assign and set the
> > gsi to kernel. When the configure notifier was eventfd_signal by host
> > kernel, this will finally inject an msix interrupt to guest
> > ---
> > hw/virtio/virtio-pci.c | 186 ++++++++++++++++++++++++++---------------
> > 1 file changed, 120 insertions(+), 66 deletions(-)
> >
> > diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> > index 2b7e6cc0d9..07d28dd367 100644
> > --- a/hw/virtio/virtio-pci.c
> > +++ b/hw/virtio/virtio-pci.c
> > @@ -664,12 +664,10 @@ static uint32_t virtio_read_config(PCIDevice *pci_dev,
> > }
> >
> > static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
> > - unsigned int queue_no,
> > unsigned int vector)
> > {
> > VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
> > int ret;
> > -
>
>
> Unnecessary changes.
>
will fix this
>
> > if (irqfd->users == 0) {
> > ret = kvm_irqchip_add_msi_route(kvm_state, vector,
> > &proxy->pci_dev);
> > if (ret < 0) {
> > @@ -708,93 +706,120 @@ static void
> > kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
> > ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n,
> > irqfd->virq);
> > assert(ret == 0);
> > }
> > -
>
>
> So did here.
>
will fix this
>
> > -static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
> > + static int virtio_pci_get_notifier(VirtIOPCIProxy *proxy, int queue_no,
> > + EventNotifier **n, unsigned int
> > *vector)
>
>
> The indentation looks not correct.
>
>
> > {
> > PCIDevice *dev = &proxy->pci_dev;
> > VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> > - VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
> > - unsigned int vector;
> > - int ret, queue_no;
> > VirtQueue *vq;
> > - EventNotifier *n;
> > - for (queue_no = 0; queue_no < nvqs; queue_no++) {
> > +
> > + if (queue_no == -1) {
> > + *n = virtio_get_config_notifier(vdev);
> > + *vector = vdev->config_vector;
> > + } else {
> > if (!virtio_queue_get_num(vdev, queue_no)) {
> > - break;
> > - }
> > - vector = virtio_queue_vector(vdev, queue_no);
> > - if (vector >= msix_nr_vectors_allocated(dev)) {
> > - continue;
> > - }
> > - ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector);
> > - if (ret < 0) {
> > - goto undo;
> > - }
> > - /* If guest supports masking, set up irqfd now.
> > - * Otherwise, delay until unmasked in the frontend.
> > - */
> > - if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
> > - vq = virtio_get_queue(vdev, queue_no);
> > - n = virtio_queue_get_guest_notifier(vq);
> > - ret = kvm_virtio_pci_irqfd_use(proxy, n, vector);
> > - if (ret < 0) {
> > - kvm_virtio_pci_vq_vector_release(proxy, vector);
> > - goto undo;
> > - }
> > + return -1;
> > }
> > + *vector = virtio_queue_vector(vdev, queue_no);
> > + vq = virtio_get_queue(vdev, queue_no);
> > + *n = virtio_queue_get_guest_notifier(vq);
> > + }
> > + if (*vector >= msix_nr_vectors_allocated(dev)) {
> > + return -1;
> > }
> > return 0;
> > +}
> >
> > +static int kvm_virtio_pci_vector_use_one(VirtIOPCIProxy *proxy, int
> > queue_no)
> > +{
>
>
> Let's use separate patch for the introducing of
> kvm_virtio_pci_vector_user/release_one().
>
> And then do the config interrupt support on top.
>
Sure, will fix this
> Thanks
>
