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virtio: introduce macro IRTIO_CONFIG_IRQ_IDX

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To support configure interrupt for vhost-vdpa
Introduce VIRTIO_CONFIG_IRQ_IDX -1 as configure interrupt's queue index,
Then we can reuse the functions guest_notifier_mask and guest_notifier_pending.
Add the check of queue index in these drivers, if the driver does not support
configure interrupt, the function will just return

Signed-off-by: Cindy Lu <lulu@redhat.com>
Message-Id: <20211104164827.21911-2-lulu@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 2021-11-05 00:48:18 +08:00 • committed by Michael S. Tsirkin
parent 9bd6565cce
commit bf1d85c166
6 changed files with 35 additions and 2 deletions
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3
include/hw/virtio/virtio.h
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@ -67,6 +67,9 @@ typedef struct VirtQueueElement
#define VIRTIO_NO_VECTOR 0xffff
/* special index value used internally for config irqs */
#define VIRTIO_CONFIG_IRQ_IDX -1
#define TYPE_VIRTIO_DEVICE "virtio-device"
OBJECT_DECLARE_TYPE(VirtIODevice, VirtioDeviceClass, VIRTIO_DEVICE)