On Thu, Jun 3, 2021 at 2:45 PM Jason Wang <jasow...@redhat.com> wrote: > > > 在 2021/6/2 上午11:47, 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 > > > > Signed-off-by: Cindy Lu <l...@redhat.com> > > --- > > hw/virtio/virtio-pci.c | 63 ++++++++++++++++++++++++++++++++++++++++-- > > 1 file changed, 60 insertions(+), 3 deletions(-) > > > > diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c > > index f863c89de6..1e03f11a85 100644 > > --- a/hw/virtio/virtio-pci.c > > +++ b/hw/virtio/virtio-pci.c > > @@ -717,7 +717,8 @@ static int virtio_pci_get_notifier(VirtIOPCIProxy > > *proxy, int queue_no, > > VirtQueue *vq; > > > > if (queue_no == VIRTIO_CONFIG_IRQ_IDX) { > > - return -1; > > + *n = virtio_get_config_notifier(vdev); > > + *vector = vdev->config_vector; > > } else { > > if (!virtio_queue_get_num(vdev, queue_no)) { > > return -1; > > @@ -764,6 +765,10 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy > > *proxy, int nvqs) > > return ret; > > } > > > > +static int kvm_virtio_pci_vector_config_use(VirtIOPCIProxy *proxy) > > +{ > > + return kvm_virtio_pci_vector_use_one(proxy, VIRTIO_CONFIG_IRQ_IDX); > > +} > > > > static void kvm_virtio_pci_vector_release_one(VirtIOPCIProxy *proxy, > > int queue_no) > > @@ -792,6 +797,28 @@ static void > > kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs) > > } > > } > > > > +static void kvm_virtio_pci_vector_config_release(VirtIOPCIProxy *proxy) > > +{ > > + kvm_virtio_pci_vector_release_one(proxy, VIRTIO_CONFIG_IRQ_IDX); > > +} > > > Newline please, can this survive from checkpatch.pl? > sure, will fix this , I have tried checkpatch.pl?, but seems it not working correctly in my environment > > > +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_notifier_fd_handler(vdev, VIRTIO_CONFIG_IRQ_IDX, true, > > true); > > + kvm_virtio_pci_vector_config_use(proxy); > > + } else { > > + virtio_set_notifier_fd_handler(vdev, VIRTIO_CONFIG_IRQ_IDX, > > + false, true); > > + kvm_virtio_pci_vector_config_release(proxy); > > + event_notifier_cleanup(notifier); > > + } > > + return r; > > +} > > static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy, > > unsigned int queue_no, > > unsigned int vector, > > @@ -873,9 +900,17 @@ static int virtio_pci_vector_unmask(PCIDevice *dev, > > unsigned vector, > > } > > vq = virtio_vector_next_queue(vq); > > } > > - > > + n = virtio_get_config_notifier(vdev); > > + ret = virtio_pci_vq_vector_unmask(proxy, VIRTIO_CONFIG_IRQ_IDX, > > + vector, msg, n); > > + if (ret < 0) { > > + goto config_undo; > > + } > > > I'd do this before the loop, but need to validate whether the vector is > the one that is used by the config interrupt. > sure ,I will move this section > > > return 0; > > > > +config_undo: > > + n = virtio_get_config_notifier(vdev); > > + virtio_pci_vq_vector_mask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector, n); > > > So unmask fail means it is still masked, we don't need to mask it again. > > > > undo: > > vq = virtio_vector_first_queue(vdev, vector); > > while (vq && unmasked >= 0) { > > @@ -909,6 +944,8 @@ static void virtio_pci_vector_mask(PCIDevice *dev, > > unsigned vector) > > } > > vq = virtio_vector_next_queue(vq); > > } > > + n = virtio_get_config_notifier(vdev); > > + virtio_pci_vq_vector_mask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector, n); > > } > > > > static void virtio_pci_vector_poll(PCIDevice *dev, > > @@ -942,6 +979,20 @@ static void virtio_pci_vector_poll(PCIDevice *dev, > > msix_set_pending(dev, vector); > > } > > } > > + /*check for config interrupt*/ > > + vector = vdev->config_vector; > > + notifier = virtio_get_config_notifier(vdev); > > + if (vector < vector_start || vector >= vector_end || > > + !msix_is_masked(dev, vector)) { > > + return; > > + } > > + if (k->guest_notifier_pending) { > > + if (k->guest_notifier_pending(vdev, VIRTIO_CONFIG_IRQ_IDX)) { > > + msix_set_pending(dev, vector); > > + } > > + } else if (event_notifier_test_and_clear(notifier)) { > > + msix_set_pending(dev, vector); > > + } > > > Let's consider to unify the codes with vq vector here. > > Will do this > > } > > > > static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool > > assign, > > @@ -1002,6 +1053,7 @@ static int virtio_pci_set_guest_notifiers(DeviceState > > *d, int nvqs, bool assign) > > msix_unset_vector_notifiers(&proxy->pci_dev); > > if (proxy->vector_irqfd) { > > kvm_virtio_pci_vector_release(proxy, nvqs); > > + kvm_virtio_pci_vector_config_release(proxy); > > g_free(proxy->vector_irqfd); > > proxy->vector_irqfd = NULL; > > } > > @@ -1029,6 +1081,10 @@ static int > > virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign) > > goto assign_error; > > } > > } > > + r = virtio_pci_set_config_notifier(d, assign); > > + if (r < 0) { > > + goto config_error; > > + } > > r = msix_set_vector_notifiers(&proxy->pci_dev, > > virtio_pci_vector_unmask, > > virtio_pci_vector_mask, > > @@ -1045,7 +1101,8 @@ notifiers_error: > > assert(assign); > > kvm_virtio_pci_vector_release(proxy, nvqs); > > } > > - > > > Newline should be kept here. > > Thanks > > will correct this
> > +config_error: > > + kvm_virtio_pci_vector_config_release(proxy); > > assign_error: > > /* We get here on assignment failure. Recover by undoing for VQs 0 .. > > n. */ > > assert(assign); >