From 7d847d0c9b93b91160f40d69a65c904d76f1edd8 Mon Sep 17 00:00:00 2001 From: Cindy Lu Date: Thu, 22 Dec 2022 15:04:47 +0800 Subject: virtio: add support for configure interrupt Add the functions to support the configure interrupt in virtio The function virtio_config_guest_notifier_read will notify the guest if there is an configure interrupt. The function virtio_config_set_guest_notifier_fd_handler is to set the fd hander for the notifier Signed-off-by: Cindy Lu Message-Id: <20221222070451.936503-7-lulu@redhat.com> Acked-by: Jason Wang Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/virtio/virtio.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'hw') diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 289eb71..6ff797e 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -3417,7 +3417,14 @@ static void virtio_queue_guest_notifier_read(EventNotifier *n) virtio_irq(vq); } } +static void virtio_config_guest_notifier_read(EventNotifier *n) +{ + VirtIODevice *vdev = container_of(n, VirtIODevice, config_notifier); + if (event_notifier_test_and_clear(n)) { + virtio_notify_config(vdev); + } +} void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, bool with_irqfd) { @@ -3434,6 +3441,23 @@ void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, } } +void virtio_config_set_guest_notifier_fd_handler(VirtIODevice *vdev, + bool assign, bool with_irqfd) +{ + EventNotifier *n; + n = &vdev->config_notifier; + if (assign && !with_irqfd) { + event_notifier_set_handler(n, virtio_config_guest_notifier_read); + } else { + event_notifier_set_handler(n, NULL); + } + if (!assign) { + /* Test and clear notifier before closing it,*/ + /* in case poll callback didn't have time to run. */ + virtio_config_guest_notifier_read(n); + } +} + EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) { return &vq->guest_notifier; @@ -3514,6 +3538,11 @@ EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) return &vq->host_notifier; } +EventNotifier *virtio_config_get_guest_notifier(VirtIODevice *vdev) +{ + return &vdev->config_notifier; +} + void virtio_queue_set_host_notifier_enabled(VirtQueue *vq, bool enabled) { vq->host_notifier_enabled = enabled; -- cgit v1.1