[PATCH 0/6] transport-mmio: Support administration virtqueues

[Parav Pandit <parav@nvidia.com>]

Administration virtqueues and group administration commands are
defined in a transport independent way, but only the PCI transport
describes how a device exposes administration virtqueues. For
MMIO, VIRTIO_F_ADMIN_VQ is listed as reserved for future use.

Group administration commands for the Self group type, such as device
capabilities and device resource objects, are equally useful for
memory mapped virtio devices. This series adds administration
virtqueue support to the MMIO transport. Only the Self group type is
applicable to MMIO.

Two read-only registers are added in the unused range between
QueueReset and ConfigGeneration, mirroring the PCI admin_queue_index
and admin_queue_num fields:

  AdminQueueIndex (0x0c4) - index of the first administration virtqueue
  AdminQueueNum   (0x0c8) - number of administration virtqueues

Their presence is indicated by VIRTIO_F_ADMIN_VQ, so no new MMIO
Version is required and existing devices and drivers are unaffected.
Administration virtqueues are configured, enabled, reset and notified
like any other virtqueue.

Patch summary:
1. Introduce administration virtqueues for the MMIO transport, limited
   to the Self group type.
2. Add the AdminQueueIndex and AdminQueueNum registers.
3. Remove VIRTIO_F_ADMIN_VQ from the MMIO reserved features and update
   the feature bit description.
4. Reference the transport specific discovery from the generic
   administration virtqueues section.
5. Add the missing PCI driver requirement for admin_queue_index and
   admin_queue_num, which the spec already describes as valid only if
   VIRTIO_F_ADMIN_VQ has been negotiated.
6. Add MMIO device and driver requirements and conformance references.

Parav Pandit (6):
  transport-mmio: Introduce administration virtqueues
  transport-mmio: Add administration virtqueue registers
  transport-mmio: Remove ADMIN_VQ from features reserved for future use
  admin: Reference transport specific administration virtqueue discovery
  transport-pci: Add missing driver requirement for admin queue fields
  transport-mmio: Add administration virtqueue requirements

 admin.tex          |  6 ++-
 conformance.tex    |  2 +
 content.tex        |  3 ++
 transport-mmio.tex | 96 ++++++++++++++++++++++++++++++++++++++++------
 transport-pci.tex  |  3 ++
 5 files changed, 97 insertions(+), 13 deletions(-)

-- 
2.43.0