On Wed, Jan 27, 2021 at 1:44 PM Jason Wang <jasow...@redhat.com> wrote:
>
>
> On 2021/1/26 下午3:42, Cindy Lu wrote:
> > 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
> >
> > Signed-off-by: Cindy Lu <l...@redhat.com>
> > ---
> > hw/virtio/virtio-pci.c | 92 ++++++++++++++++++++++++++++++++++--------
> > 1 file changed, 75 insertions(+), 17 deletions(-)
> >
> > diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> > index 36524a5728..8e192600b8 100644
> > --- a/hw/virtio/virtio-pci.c
> > +++ b/hw/virtio/virtio-pci.c
> > @@ -664,7 +664,6 @@ 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];
> > @@ -691,23 +690,17 @@ static void
> > kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
> > }
> >
> > static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
> > - unsigned int queue_no,
> > + EventNotifier *n,
> > unsigned int vector)
> > {
> > VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
> > - VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> > - VirtQueue *vq = virtio_get_queue(vdev, queue_no);
> > - EventNotifier *n = virtio_queue_get_guest_notifier(vq);
> > return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL,
> > irqfd->virq);
> > }
> >
> > static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
> > - unsigned int queue_no,
> > + EventNotifier *n ,
> > unsigned int vector)
> > {
> > - VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> > - VirtQueue *vq = virtio_get_queue(vdev, queue_no);
> > - EventNotifier *n = virtio_queue_get_guest_notifier(vq);
> > VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
> > int ret;
> >
> > @@ -722,7 +715,8 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy
> > *proxy, int nvqs)
> > VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
> > unsigned int vector;
> > int ret, queue_no;
> > -
> > + VirtQueue *vq;
> > + EventNotifier *n;
>
>
> new line is needed.
>
will fix this
>
> > for (queue_no = 0; queue_no < nvqs; queue_no++) {
> > if (!virtio_queue_get_num(vdev, queue_no)) {
> > break;
> > @@ -731,7 +725,7 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy
> > *proxy, int nvqs)
> > if (vector >= msix_nr_vectors_allocated(dev)) {
> > continue;
> > }
> > - ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector);
> > + ret = kvm_virtio_pci_vq_vector_use(proxy, vector);
> > if (ret < 0) {
> > goto undo;
> > }
> > @@ -739,7 +733,9 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy
> > *proxy, int nvqs)
> > * Otherwise, delay until unmasked in the frontend.
> > */
> > if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
> > - ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
> > + 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;
> > @@ -755,13 +751,69 @@ undo:
> > continue;
> > }
> > if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
> > - kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
> > + vq = virtio_get_queue(vdev, queue_no);
> > + n = virtio_queue_get_guest_notifier(vq);
> > + kvm_virtio_pci_irqfd_release(proxy, n, vector);
> > }
> > kvm_virtio_pci_vq_vector_release(proxy, vector);
> > }
> > return ret;
> > }
> >
> > +static int kvm_virtio_pci_vector_config_use(VirtIOPCIProxy *proxy)
> > +{
> > +
> > + VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> > + unsigned int vector;
> > + int ret;
> > + EventNotifier *n = virtio_get_config_notifier(vdev);
> > +
> > + vector = vdev->config_vector ;
> > + ret = kvm_virtio_pci_vq_vector_use(proxy, vector);
> > + if (ret < 0) {
> > + goto undo;
> > + }
> > + ret = kvm_virtio_pci_irqfd_use(proxy, n, vector);
> > + if (ret < 0) {
> > + goto undo;
> > + }
> > + return 0;
> > +undo:
> > + kvm_virtio_pci_irqfd_release(proxy, n, vector);
> > + return ret;
> > +}
>
>
> newline is needed.
>
will fix this
>
> > +static void kvm_virtio_pci_vector_config_release(VirtIOPCIProxy *proxy)
> > +{
> > + PCIDevice *dev = &proxy->pci_dev;
> > + VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> > + unsigned int vector;
> > + EventNotifier *n = virtio_get_config_notifier(vdev);
> > + vector = vdev->config_vector ;
> > + if (vector >= msix_nr_vectors_allocated(dev)) {
> > + return;
> > + }
> > + kvm_virtio_pci_irqfd_release(proxy, n, vector);
> > + kvm_virtio_pci_vq_vector_release(proxy, vector);
> > +}
> > +
> > +static int virtio_pci_set_config_notifier(DeviceState *d, bool assign)
> > +{
> > + VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
> > + VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> > + EventNotifier *notifier = virtio_get_config_notifier(vdev);
> > + int r = 0;
> > + if (assign) {
> > + r = event_notifier_init(notifier, 0);
> > + virtio_set_config_notifier_fd_handler(vdev, true, true);
> > + kvm_virtio_pci_vector_config_use(proxy);
> > + } else {
> > + virtio_set_config_notifier_fd_handler(vdev, false, true);
> > + kvm_virtio_pci_vector_config_release(proxy);
> > + event_notifier_cleanup(notifier);
> > + }
> > + return r;
> > +}
>
>
> Two questions, don't we need to check whether or not MSIX is enalbed in
> this case? Instead of introducing new helpers that is easy to be buggy I
> still prefer to re-use virtio_pci_set_guest_notifier:
>
> We can switch to use accepts EventNotifier instead of virtqueue index.
> And we need also convert virtqueue_set_guest_notifier_fd_handler() to
> accept EventNotifier.
>
sure, I will fix this
>
> > +
> > static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
> > {
> > PCIDevice *dev = &proxy->pci_dev;
> > @@ -769,7 +821,8 @@ static void
> > kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
> > unsigned int vector;
> > int queue_no;
> > VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
> > -
> > + VirtQueue *vq;
> > + EventNotifier *n;
>
>
> newline is needed.
>
> Thanks
>
>
> > for (queue_no = 0; queue_no < nvqs; queue_no++) {
> > if (!virtio_queue_get_num(vdev, queue_no)) {
> > break;
> > @@ -782,7 +835,9 @@ static void
> > kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
> > * Otherwise, it was cleaned when masked in the frontend.
> > */
> > if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
> > - kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
> > + vq = virtio_get_queue(vdev, queue_no);
> > + n = virtio_queue_get_guest_notifier(vq);
> > + kvm_virtio_pci_irqfd_release(proxy, n, vector);
> > }
> > kvm_virtio_pci_vq_vector_release(proxy, vector);
> > }
> > @@ -823,7 +878,7 @@ static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy
> > *proxy,
> > event_notifier_set(n);
> > }
> > } else {
> > - ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
> > + ret = kvm_virtio_pci_irqfd_use(proxy, n, vector);
> > }
> > return ret;
> > }
> > @@ -835,13 +890,15 @@ static void virtio_pci_vq_vector_mask(VirtIOPCIProxy
> > *proxy,
> > VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> > VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
> >
> > + VirtQueue *vq = virtio_get_queue(vdev, queue_no);
> > + EventNotifier *n = virtio_queue_get_guest_notifier(vq);
> > /* If guest supports masking, keep irqfd but mask it.
> > * Otherwise, clean it up now.
> > */
> > if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
> > k->guest_notifier_mask(vdev, queue_no, true);
> > } else {
> > - kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
> > + kvm_virtio_pci_irqfd_release(proxy, n, vector);
> > }
> > }
> >
> > @@ -2137,6 +2194,7 @@ static void virtio_pci_bus_class_init(ObjectClass
> > *klass, void *data)
> > k->ioeventfd_assign = virtio_pci_ioeventfd_assign;
> > k->get_dma_as = virtio_pci_get_dma_as;
> > k->queue_enabled = virtio_pci_queue_enabled;
> > + k->set_config_notifiers = virtio_pci_set_config_notifier;
> > }
> >
> > static const TypeInfo virtio_pci_bus_info = {
>
