[OASIS Issue Tracker] Updated: (VIRTIO-39) pci device operation without BAR access

[ http://tools.oasis-open.org/issues/browse/VIRTIO-39?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Tsirkin updated VIRTIO-39:
----------------------------------

    Description: 
pci express spec forbids exclusive dependency on IO BAR accesses for device operation.
on the other hand, restricted environments such as pxe have
trouble accessing memory BARs.
This calls for a fallback mechanism for device access.

  was:
pci express spec forbids exclusive dependency on IO BAR accesses for device operation.
on the other hand, restricted environments such as pxe have
trouble accessing memory BARs.
This calls for a fallback mechanism for device access.



       Proposal: ">http://mid.gmane.org/[email protected]  (was: One solution is to use configuration space.
A couple of registers for address/data can serve as
a gateway for configuration/notification.)

> pci device operation without BAR access
> ---------------------------------------
>
>                 Key: VIRTIO-39
>                 URL: http://tools.oasis-open.org/issues/browse/VIRTIO-39
>             Project: OASIS Virtual I/O Device (VIRTIO) TC
>          Issue Type: Improvement
>            Reporter: Michael Tsirkin
>            Assignee: Michael Tsirkin
>
> pci express spec forbids exclusive dependency on IO BAR accesses for device operation.
> on the other hand, restricted environments such as pxe have
> trouble accessing memory BARs.
> This calls for a fallback mechanism for device access.

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