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

["Michael S. Tsirkin" <mst@redhat.com>]

On Sat, Oct 17, 2026 at 02:45:50PM +0300, Parav Pandit wrote:
> 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.


Thanks, will review. We also need ccw please.

> 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