virtio message

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

From: OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>
To: virtio@lists.oasis-open.org
Date: Mon, 30 Sep 2013 05:40:40 +0000 (UTC)

pci device operation without BAR access
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                 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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