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author | Rusty Russell <rusty@rustcorp.com.au> | 2008-02-04 23:50:03 -0500 |
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committer | Rusty Russell <rusty@rustcorp.com.au> | 2008-02-04 23:50:03 +1100 |
commit | 6e5aa7efb27aec7e55b6463fa2c8db594c4226fa (patch) | |
tree | 060a955e711ac224136157a5410e88dcdab965af /include/linux/virtio_config.h | |
parent | b3369c1fb410fddeb38a404316c861395f6d6ae8 (diff) | |
download | kernel_samsung_espresso10-6e5aa7efb27aec7e55b6463fa2c8db594c4226fa.zip kernel_samsung_espresso10-6e5aa7efb27aec7e55b6463fa2c8db594c4226fa.tar.gz kernel_samsung_espresso10-6e5aa7efb27aec7e55b6463fa2c8db594c4226fa.tar.bz2 |
virtio: reset function
A reset function solves three problems:
1) It allows us to renegotiate features, eg. if we want to upgrade a
guest driver without rebooting the guest.
2) It gives us a clean way of shutting down virtqueues: after a reset,
we know that the buffers won't be used by the host, and
3) It helps the guest recover from messed-up drivers.
So we remove the ->shutdown hook, and the only way we now remove
feature bits is via reset.
We leave it to the driver to do the reset before it deletes queues:
the balloon driver, for example, needs to chat to the host in its
remove function.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux/virtio_config.h')
-rw-r--r-- | include/linux/virtio_config.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index 81f828a..d581b29 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -43,6 +43,9 @@ struct virtio_device; * @set_status: write the status byte * vdev: the virtio_device * status: the new status byte + * @reset: reset the device + * vdev: the virtio device + * After this, status and feature negotiation must be done again * @find_vq: find a virtqueue and instantiate it. * vdev: the virtio_device * index: the 0-based virtqueue number in case there's more than one. @@ -59,6 +62,7 @@ struct virtio_config_ops const void *buf, unsigned len); u8 (*get_status)(struct virtio_device *vdev); void (*set_status)(struct virtio_device *vdev, u8 status); + void (*reset)(struct virtio_device *vdev); struct virtqueue *(*find_vq)(struct virtio_device *vdev, unsigned index, void (*callback)(struct virtqueue *)); |