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hw/virtio: add config support to vhost-user-device

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To use the generic device the user will need to provide the config
region size via the command line. We also add a notifier so the guest
can be pinged if the remote daemon updates the config.

With these changes:

  -device vhost-user-device-pci,virtio-id=41,num_vqs=2,config_size=8

is equivalent to:

  -device vhost-user-gpio-pci

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230710153522.3469097-11-alex.bennee@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Bennée 2023-07-10 16:35:12 +01:00 • committed by Michael S. Tsirkin
parent eee7780973
commit f92a2d61cd
2 changed files with 58 additions and 1 deletions
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1
include/hw/virtio/vhost-user-device.h
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@ -22,6 +22,7 @@ struct VHostUserBase {
CharBackend chardev;
uint16_t virtio_id;
uint32_t num_vqs;
uint32_t config_size;
/* State tracking */
VhostUserState vhost_user;
struct vhost_virtqueue *vhost_vq;