diff options
author | Rusty Russell <rusty@rustcorp.com.au> | 2008-02-04 23:49:56 -0500 |
---|---|---|
committer | Rusty Russell <rusty@rustcorp.com.au> | 2008-02-04 23:49:57 +1100 |
commit | a586d4f6016f7139d8c26df0e6927131168d3b5b (patch) | |
tree | 1c47e1a6b6b8fb18baa42f32980f29c4ae9cbbdc /include/linux/lguest_launcher.h | |
parent | f35d9d8aae08940b7fdd1bb8110619da2ece6b28 (diff) | |
download | kernel_goldelico_gta04-a586d4f6016f7139d8c26df0e6927131168d3b5b.zip kernel_goldelico_gta04-a586d4f6016f7139d8c26df0e6927131168d3b5b.tar.gz kernel_goldelico_gta04-a586d4f6016f7139d8c26df0e6927131168d3b5b.tar.bz2 |
virtio: simplify config mechanism.
Previously we used a type/len pair within the config space, but this
seems overkill. We now simply define a structure which represents the
layout in the config space: the config space can now only be extended
at the end.
The main driver-visible changes:
1) We indicate what fields are present with an explicit feature bit.
2) Virtqueues are explicitly numbered, and not in the config space.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux/lguest_launcher.h')
-rw-r--r-- | include/linux/lguest_launcher.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/include/linux/lguest_launcher.h b/include/linux/lguest_launcher.h index 697104d..589be3e 100644 --- a/include/linux/lguest_launcher.h +++ b/include/linux/lguest_launcher.h @@ -23,7 +23,12 @@ struct lguest_device_desc { /* The device type: console, network, disk etc. Type 0 terminates. */ __u8 type; - /* The number of bytes of the config array. */ + /* The number of virtqueues (first in config array) */ + __u8 num_vq; + /* The number of bytes of feature bits. Multiply by 2: one for host + * features and one for guest acknowledgements. */ + __u8 feature_len; + /* The number of bytes of the config array after virtqueues. */ __u8 config_len; /* A status byte, written by the Guest. */ __u8 status; @@ -31,7 +36,7 @@ struct lguest_device_desc { }; /*D:135 This is how we expect the device configuration field for a virtqueue - * (type VIRTIO_CONFIG_F_VIRTQUEUE) to be laid out: */ + * to be laid out in config space. */ struct lguest_vqconfig { /* The number of entries in the virtio_ring */ __u16 num; |