[Qemu-devel] [PATCH v11 0/8] Shared Library Module Support

[Fam Zheng]

This series implements feature of shared object building as described in:

http://wiki.qemu.org/Features/Modules

The main idea behind modules is to isolate dependencies on third party
libraries from qemu executables, such as libglusterfs or librbd, so that the
end users can install core qemu package with fewer dependencies.  And only for
those who want to use particular modules, need they install qemu-foo
sub-package, which in turn requires libbar and libbiz packages.

It's implemented in three steps:

1. The first patches fix current build system to correctly handle nested
   variables and object specific options:

    [01/08] ui/Makefile.objs: delete unnecessary cocoa.o dependency
    [02/08] make.rule: fix $(obj) to a real relative path
    [03/08] rule.mak: allow per object cflags and libs

2. The Makefile changes adds necessary options and rules to build DSO objects:

    [04/08] build-sys: introduce common-obj-m and block-obj-m for DSO

3. The next patch adds code to load modules from installed directory:

    [05/08] module: implement module loading

A few more changes are following to complete it:

    [06/08] Makefile: install modules with "make install"
    [07/08] .gitignore: ignore module related files (dll, so, mo)

In the end of series, the block drivers are converted:

    [08/08] block: convert block drivers linked with libs to modules

v11:
    [04] Link DSO with  -Wl,--enable-new-dtags -Wl,-rpath,'$$ORIGIN' (Richard)
    [05] Reuse module_init_type in module_load, no separate load type enums.
         Separate list of modules by type. It's simply list of built modules
         now. No whitelist option in configure.
         Support multiple module_init() in single module.

v10:
    All modules in a single directory (moddir), with module type prefixed:
        /usr/lib/qemu/block-{curl,iscsi,...}.so
    The module names for user to list in module whitelist is consequently:
        block-curl, block-iscsi, ui-*, etc.
    In Makfile, the installed module filename is simply generated by:
        $(subst /,-,%.so)
    Which is also the rule for module names.

    [05] Add #undef CONFIG_MODULE_WHITELIST in config-host.h.
         Use static array for whitelist. (Richard)

v9: Address Daniel's comment with patch 05:
    Drop readdir().
    Squash module whitelist changes to module loading patch.

v8: This version introduces two runtime loading checks:
    * Module init function no longer with __attribute__((constructor)), and
      mangled with per configure fingerprint. See patch 05.
    * Module whitelist as configure option.

    [04] Link libqemustub.a to DSO. (iscsi needs qemu_get_vm_name).
         Fix single object module link.
         Fix extract-libs to also extract .o libs that'd be expanded later from
         .mo.
    [05] Add init function name mangling.
    [06] New.
    [07] Fix typo in "make install". [Daniel]

Fam Zheng (7):
  make.rule: fix $(obj) to a real relative path
  rule.mak: allow per object cflags and libs
  build-sys: introduce common-obj-m and block-obj-m for DSO
  module: implement module loading
  Makefile: install modules with "make install"
  .gitignore: ignore module related files (dll, so, mo)
  block: convert block drivers linked with libs to modules

Peter Maydell (1):
  ui/Makefile.objs: delete unnecessary cocoa.o dependency

 .gitignore            |   3 ++
 Makefile              |  30 +++++++++++++-
 Makefile.objs         |  19 ++-------
 Makefile.target       |  21 ++++++++--
 block/Makefile.objs   |  11 +++++-
 configure             |  76 +++++++++++++++++++++++------------
 include/qemu/module.h |  12 ++++++
 module-common.c       |  10 +++++
 rules.mak             |  80 +++++++++++++++++++++++++++++++------
 scripts/create_config |  14 +++++++
 ui/Makefile.objs      |   2 -
 util/module.c         | 107 +++++++++++++++++++++++++++++++++++++++++++++++++-
 12 files changed, 320 insertions(+), 65 deletions(-)
 create mode 100644 module-common.c

-- 
1.8.3.1