"Michael S. Tsirkin" <> writes:
> VIRTIO-34
>
> Signed-off-by: Michael S. Tsirkin <>
> ---
> virtio-v1.0-wd01-part1-specification.txt | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/virtio-v1.0-wd01-part1-specification.txt b/virtio-v1.0-wd01-part1-specification.txt
> index 6ab4ff8..b3f7c9e 100644
> --- a/virtio-v1.0-wd01-part1-specification.txt
> +++ b/virtio-v1.0-wd01-part1-specification.txt
> @@ -802,10 +802,18 @@ supported by the device. The Subsystem Vendor ID should reflect
> the PCI Vendor ID of the environment (it's currently only used
> for informational purposes by the guest).
>
> +All Drivers must match devices with any Revision ID, this
> +is to allow devices to be versioned without breaking drivers.
> +
> 2.3.1.1.1 Legacy Interfaces: A Note on PCI Device Discovery
> -------------------------
> -Transitional devices must also have a Revision ID of 0 to match
> -this specification.
> +Transitional devices must have a Revision ID of 0 to match
> +legacy drivers.
> +
> +Non-transitional devices must have a Revision ID of 1 or higher.
> +
> +Both transitional and non-transitional drivers must match
> +any Revision ID value.
Hmm, so a non-transitional driver should match revision ID 0? Sure,
it'll fail gracefully when it doesn't find the capability, but it's a
bit weird.
Cheers,
Rusty.
