In session mode, the process of create/close a session
makes we have a least one full round-trip cost from guest to host to guest
to be able to send any data for symmetric algorithms. It gets ourself into
synchronization troubles in some scenarios like a web server handling lots
of small requests whose algorithms and keys are different.

We can support one-blob request (no sessions) as well for symmetric
algorithms, including HASH, MAC services. The benefit is obvious for
HASH service because it's usually a one-blob operation.

The code realization is based on the latest virtio crypto spec:

[PATCH v18 0/2] virtio-crypto: virtio crypto device specification
  https://lists.nongnu.org/archive/html/qemu-devel/2017-04/msg03860.html

Patch 1~4 introduce stateless symmetric crypto operations stuff for
stateless mode in cryptodev backend framework.

Patch 5~8 introduce stateless operation for virtio crypto device and
add 5 feature bits to support it.

Patch 9 is a experimental patch for testing the new stateless functions, so
that people don't need to compile a new linux driver to test it (I havn't
realize the driver yet, It's not a big deal). Of cource the patch
can't be upsteamed until the qtest framework supports virtio 1.0 or latter.

Gonglei (9):
  cryptodev: introduce stateless sym operation stuff
  cryptodev: extract one util function
  cryptodev: add missing op_code for symmertric crypto
  cryptodev-builtin: realize stateless operation function
  virtio-crypto: update header file
  virtio-crypto: rework virtio_crypto_handle_request
  virtio-crypto: add stateless crypto request handler
  virtio-crypto: add host feature bits support
  qtest: emulate virtio crypto as a legacy device for experiment

 backends/cryptodev-builtin.c                   | 189 ++++++--
 backends/cryptodev.c                           |  21 +
 docs/specs/pci-ids.txt                         |   2 +
 hw/virtio/virtio-crypto-pci.c                  |   4 +-
 hw/virtio/virtio-crypto.c                      | 340 +++++++++++++-
 include/hw/pci/pci.h                           |   2 +
 include/hw/virtio/virtio-crypto.h              |   2 +
 include/standard-headers/linux/virtio_crypto.h | 210 ++++++++-
 include/sysemu/cryptodev.h                     |  22 +
 tests/Makefile.include                         |   3 +
 tests/virtio-crypto-test.c                     | 596 +++++++++++++++++++++++++
 11 files changed, 1332 insertions(+), 59 deletions(-)
 create mode 100644 tests/virtio-crypto-test.c

-- 
1.8.3.1