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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 <lulu@redhat.com>
Message-Id: <20221222070451.936503-7-lulu@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cindy Lu 2022-12-22 15:04:47 +08:00 committed by Michael S. Tsirkin
parent 259f3acc1c
commit 7d847d0c9b
2 changed files with 33 additions and 0 deletions
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29
hw/virtio/virtio.c
View File

@ -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;

4
include/hw/virtio/virtio.h
View File

@ -155,6 +155,7 @@ struct VirtIODevice
AddressSpace *dma_as;
QLIST_HEAD(, VirtQueue) *vector_queues;
QTAILQ_ENTRY(VirtIODevice) next;
EventNotifier config_notifier;
};
struct VirtioDeviceClass {
@ -377,6 +378,9 @@ void virtio_queue_aio_attach_host_notifier_no_poll(VirtQueue *vq, AioContext *ct
void virtio_queue_aio_detach_host_notifier(VirtQueue *vq, AioContext *ctx);
VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector);
VirtQueue *virtio_vector_next_queue(VirtQueue *vq);
EventNotifier *virtio_config_get_guest_notifier(VirtIODevice *vdev);
void virtio_config_set_guest_notifier_fd_handler(VirtIODevice *vdev,
bool assign, bool with_irqfd);
static inline void virtio_add_feature(uint64_t *features, unsigned int fbit)
{