[PATCH] 2.5 Reserve device ID 0 (zero) as invalid

Signed-off-by: Pawel Moll <>
---
 virtio-v1.0-wd01-part1-specification.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/virtio-v1.0-wd01-part1-specification.txt b/virtio-v1.0-wd01-part1-specification.txt
index a3ee054..09c2305 100644
--- a/virtio-v1.0-wd01-part1-specification.txt
+++ b/virtio-v1.0-wd01-part1-specification.txt
@@ -1076,6 +1076,8 @@ Discovering what devices are available and their type is bus-dependent.
 | Device ID  |   Virtio Device    |
 +------------+--------------------+
 +------------+--------------------+
+| 0          | reserved (invalid) |
++------------+--------------------+
 | 1          |   network card     |
 +------------+--------------------+
 | 2          |   block device     |
-- 
1.8.1.2
{code}

> Reserve device ID 0 (zero) as invalid
> -------------------------------------
>
>                 Key: VIRTIO-7
>                 URL: http://tools.oasis-open.org/issues/browse/VIRTIO-7
>             Project: OASIS Virtual I/O Device (VIRTIO) TC
>          Issue Type: Improvement
>            Reporter: Pawel Moll
>            Assignee: Pawel Moll
>
> Make the virtio device ID 0 reserved (or illegal). This value is illegal for PCI devices anyway, and mmio driver can consider such ID as "non present".

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