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Subject: Re: [virtio] [OASIS Issue Tracker] Created: (VIRTIO-7) Reserve device ID 0 (zero) as invalid
OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org> writes: > 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 > > > 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". Something like this? commit d8a995390a273bc6d209cf8a6f8a178b424a6438 Author: Rusty Russell <rusty@au1.ibm.com> Date: Tue Aug 20 16:13:19 2013 +0930 Reserve device ID 0 (zero) as invalid See http://tools.oasis-open.org/issues/browse/VIRTIO-7 Signed-off-by: Rusty Russell <rusty@au1.ibm.com> diff --git a/virtio-v1.0-wd01-part1-specification.txt b/virtio-v1.0-wd01-part1-specification.txt index 8fc96b2..f989630 100644 --- a/virtio-v1.0-wd01-part1-specification.txt +++ b/virtio-v1.0-wd01-part1-specification.txt @@ -1069,6 +1069,8 @@ Discovering what devices are available and their type is bus-dependent. | Device ID | Virtio Device | +------------+--------------------+ +------------+--------------------+ +| 0 | none (ignore) | ++------------+--------------------+ | 1 | network card | +------------+--------------------+ | 2 | block device | @@ -1094,6 +1096,8 @@ Discovering what devices are available and their type is bus-dependent. | 12 | virtio CAIF | +------------+--------------------+ +When a device is discovered with a device ID of 0, it should be ignored. + 2.5.1 Network Device ====================
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