[Qemu-devel] [PATCH 0/4] dataplane: use more of the generic virtio data structures, drop hostmem

[Paolo Bonzini <pbonzini@redhat.com>]

Now that the memory API is thread-safe, we can use it in
virtio-blk-dataplane and replace hostmem.[ch].  This series does this,
and also changes the vring API to use VirtQueueElement (with an eye
towards migration).  With this change, virtio-blk-dataplane is also safe
against memory hot-unplug.

The next step would be to replace memory_region_find with
address_space_{map,unmap}, which handle dirtying of memory correctly.
However these APIs are not thread-safe yet, and neither is the handling
of dirty memory (Juan's patches may be a start here).

Also, the usage of iov_discard_{front,back} may cause some complication
when we use address_space_{map,unmap}.  We may have to change a bit the
logic in virtio-blk-dataplane to switch to address_space_{map,unmap}.

If we do not want to do this intermediate step, the first three patches
can be applied separately from the fourth.

Paolo Bonzini (4):
  vring: create a common function to parse descriptors
  vring: factor common code for error exits
  dataplane: change vring API to use VirtQueueElement
  dataplane: replace hostmem with memory_region_find

 hw/block/dataplane/virtio-blk.c       |  86 +++++-------
 hw/virtio/dataplane/Makefile.objs     |   2 +-
 hw/virtio/dataplane/hostmem.c         | 183 -------------------------
 hw/virtio/dataplane/vring.c           | 244 +++++++++++++++++++++-------------
 include/hw/virtio/dataplane/hostmem.h |  58 --------
 include/hw/virtio/dataplane/vring.h   |   9 +-
 6 files changed, 193 insertions(+), 389 deletions(-)
 delete mode 100644 hw/virtio/dataplane/hostmem.c
 delete mode 100644 include/hw/virtio/dataplane/hostmem.h

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1.8.3.1