[PATCH v3 for 7.2 00/21] virtio-gpio and various virtio cleanups

["Alex Bennée" <alex.bennee@linaro.org>]

Hi,

After much slogging through the vhost-user code I've gotten the
virtio-gpio device working again. The core change in pushing the
responsibility for VHOST_USER_F_PROTOCOL_FEATURES down to the
vhost-user layer (which knows it needs it). We still need to account
for that in virtio-gpio because the result of the negotiating protocol
features is the vrings start disabled so the stub needs to explicitly
enable them. I did consider pushing this behaviour explicitly into
vhost_dev_start but that would have required un-picking it from
vhost-net (which is the only other device which uses protocol features
AFAICT - but is a measure more complex in it's setup).

As last time there are a whole series of clean-ups and doc tweaks. I
don't know if any are trivial enough to sneak into later RCs but it
shouldn't be a problem to wait until the tree re-opens.

There is a remaining issue that a --enable-sanitizers build fails for
qos-test due to leaks. It shows up as a leak from:

  Direct leak of 240 byte(s) in 1 object(s) allocated from:                                                                                                                    
      #0 0x7fc5a3f2a037 in __interceptor_calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:154                                                                    
      #1 0x7fc5a2e5cda0 in g_malloc0 ../../../glib/gmem.c:136                                                                                                                  
      #2 0x55ce773cc728 in virtio_device_realize ../../hw/virtio/virtio.c:3691                                                                                                 
      #3 0x55ce7784ed7e in device_set_realized ../../hw/core/qdev.c:553                                                                                                        
      #4 0x55ce77862d0c in property_set_bool ../../qom/object.c:2273                 

I'm not entirely sure what the allocation is because it gets inlined
in the virtio_device_realize call. Perhaps it's the QOM object itself
which is never gracefully torn down at the end of the test?

However when I attempted to bisect I found master was broken as well.
For example in my arm/aarch64-softmmu build we see 5 failures:

Summary of Failures:

   3/48 qemu:qtest+qtest-aarch64 / qtest-aarch64/migration-test            ERROR          96.15s   killed by signal 6 SIGABRT
   9/48 qemu:qtest+qtest-aarch64 / qtest-aarch64/qos-test                  ERROR          32.50s   killed by signal 6 SIGABRT
  11/48 qemu:qtest+qtest-arm / qtest-arm/qos-test                          ERROR          26.93s   killed by signal 6 SIGABRT
  20/48 qemu:qtest+qtest-aarch64 / qtest-aarch64/device-introspect-test    ERROR           5.17s   killed by signal 6 SIGABRT
  45/48 qemu:qtest+qtest-arm / qtest-arm/device-introspect-test            ERROR           4.97s   killed by signal 6 SIGABRT

Of which the qos-tests are the only new ones. I suspect something must
be preventing the other stuff being exercised in our CI system.

Alex Bennée (19):
  include/hw/virtio: more comment for VIRTIO_F_BAD_FEATURE
  include/hw: document vhost_dev feature life-cycle
  hw/virtio: fix some coding style issues
  hw/virtio: log potentially buggy guest drivers
  block/vhost-user-blk-server: don't expose
    VHOST_USER_F_PROTOCOL_FEATURES
  hw/virtio: incorporate backend features in features
  hw/virtio: gracefully handle unset vhost_dev vdev
  hw/virtio: handle un-configured shutdown in virtio-pci
  hw/virtio: fix vhost_user_read tracepoint
  hw/virtio: add some vhost-user trace events
  tests/qtest: pass stdout/stderr down to subtests
  tests/qtest: add a timeout for subprocess_run_one_test
  tests/qtest: use qos_printf instead of g_test_message
  tests/qtest: catch unhandled vhost-user messages
  tests/qtest: plain g_assert for VHOST_USER_F_PROTOCOL_FEATURES
  tests/qtest: add assert to catch bad features
  tests/qtest: implement stub for VHOST_USER_GET_CONFIG
  tests/qtest: add a get_features op to vhost-user-test
  tests/qtest: enable tests for virtio-gpio

Viresh Kumar (2):
  hw/virtio: add boilerplate for vhost-user-gpio device
  hw/virtio: add vhost-user-gpio-pci boilerplate

 include/hw/virtio/vhost-user-gpio.h  |  35 +++
 include/hw/virtio/vhost.h            |   3 +
 include/hw/virtio/virtio.h           |   7 +-
 tests/qtest/libqos/virtio-gpio.h     |  35 +++
 block/export/vhost-user-blk-server.c |   3 +-
 hw/virtio/vhost-user-gpio-pci.c      |  69 +++++
 hw/virtio/vhost-user-gpio.c          | 414 +++++++++++++++++++++++++++
 hw/virtio/vhost-user.c               |  20 +-
 hw/virtio/vhost.c                    |  16 +-
 hw/virtio/virtio-pci.c               |   9 +-
 hw/virtio/virtio.c                   |   7 +
 tests/qtest/libqos/virtio-gpio.c     | 171 +++++++++++
 tests/qtest/libqos/virtio.c          |   4 +-
 tests/qtest/qos-test.c               |   8 +-
 tests/qtest/vhost-user-test.c        | 172 +++++++++--
 hw/virtio/Kconfig                    |   5 +
 hw/virtio/meson.build                |   2 +
 hw/virtio/trace-events               |   9 +
 tests/qtest/libqos/meson.build       |   1 +
 19 files changed, 956 insertions(+), 34 deletions(-)
 create mode 100644 include/hw/virtio/vhost-user-gpio.h
 create mode 100644 tests/qtest/libqos/virtio-gpio.h
 create mode 100644 hw/virtio/vhost-user-gpio-pci.c
 create mode 100644 hw/virtio/vhost-user-gpio.c
 create mode 100644 tests/qtest/libqos/virtio-gpio.c

-- 
2.30.2