[OASIS Issue Tracker] (VIRTIO-103) PCI Common configuration layout

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

     [ https://issues.oasis-open.org/browse/VIRTIO-103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rusty Russell updated VIRTIO-103:
---------------------------------

    Environment: Reported-by: Andrew Thornton <andrewth@google.com>

> PCI Common configuration layout
> -------------------------------
>
>                 Key: VIRTIO-103
>                 URL: https://issues.oasis-open.org/browse/VIRTIO-103
>             Project: OASIS Virtual I/O Device (VIRTIO) TC
>          Issue Type: Sub-task
>    Affects Versions: virtio 1.0 csprd01
>         Environment: Reported-by: Andrew Thornton <andrewth@google.com>
>            Reporter: Rusty Russell
>            Assignee: Rusty Russell
>             Fix For: virtio 1.0 csprd03
>
>
> 4.1.2.1 Common Configuration structure layout
> device_status
> ​The spec states "​
> Writing 0 resets the device
> ​".  H
> ow does the driver know when its complete.  Proposal
> ​:​
> the resetting driver will poll this register for a non-zero value until the reset is complete after which DMA and interrupts will not occur.
> queue_size
> Is there a way to find the maximum queue size without resetting the whole device?
> queue_enable
> What happens to the state of the queue when queue_enable transitions from non-zero to zero?
> queue_desc/queue_avail/queue_used​
> Does a zero address indicate a disabled queue?  This is how current devices work but spec clarification would be useful.



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