Re: [PATCH 0/3] QEMU cpus.c refactoring part1

[Paolo Bonzini <pbonzini@redhat.com>]

On 02/07/20 08:27, Claudio Fontana wrote:
> Hi Alex, Markus, Paolo, 
> 
> maybe this could be queued in one of your queues?

Nevermind, Thunderbird was acting funny.  Queued all now.

Paolo

> Thanks a lot,
> 
> Claudio
> 
> On 6/29/20 11:35 AM, Claudio Fontana wrote:
>> Motivation and higher level steps:
>>
>> https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg04628.html
>>
>> Previous series: [RFC RESEND v7 0/4] QEMU cpus.c refactoring
>>
>> This series is already reviewed, and is a split of the first three patches
>> from the previous series (RFC). The forth and last of the previous series
>> will then be posted separately.
>>
>> PREVIOUS DISCUSSIONS:
>>
>> * should we reorder patches or moves inside patches to avoid code going
>>   from cpus.c to softmmu/cpus.c and then again to softmmu/somethingelse.c ?
>>   (Philippe)
>>
>> * some questions about headers in include/softmmu (Philippe)
>>
>>
>> [SPLIT into TWO series, changed from RFC to PATCH]
>> ----
>>
>> v6 -> v7:
>>
>> * rebased changes on top of Pavel Dovgalyuk changes to dma-helpers.c
>>   "icount: make dma reads deterministic"
>>
>> ----
>>
>> v5 -> v6:
>>
>> * rebased changes on top of Emilio G. Cota changes to cpus.c
>>   "cpu: convert queued work to a QSIMPLEQ"
>>
>> * keep a pointer in cpus.c instead of a copy of CpusAccel
>>   (Alex)
>>
>> ----
>>
>>
>> v4 -> v5: rebase on latest master
>>
>> * rebased changes on top of roman series to remove one of the extra states for hvf.
>>   (Is the result now functional for HVF?)
>>
>> * rebased changes on top of icount changes and fixes to icount_configure and
>>   the new shift vmstate. (Markus)
>>
>> v3 -> v4:
>>
>> * overall: added copyright headers to all files that were missing them
>>   (used copyright and license of the module the stuff was extracted from).
>>   For the new interface files, added SUSE LLC.
>>
>> * 1/4 (move softmmu only files from root):
>>
>>   MAINTAINERS: moved softmmu/cpus.c to its final location (from patch 2)
>>
>> * 2/4 (cpu-throttle):
>>
>>   MAINTAINERS (to patch 1),
>>   copyright Fabrice Bellard and license from cpus.c
>>
>> * 3/4 (cpu-timers, icount):
>>
>>   - MAINTAINERS: add cpu-timers.c and icount.c to Paolo
>>
>>   - break very long lines (patchew)
>>
>>   - add copyright SUSE LLC, GPLv2 to cpu-timers.h
>>
>>   - add copyright Fabrice Bellard and license from cpus.c to timers-state.h
>>     as it is lifted from cpus.c
>>
>>   - vl.c: in configure_accelerators bail out if icount_enabled()
>>     and !tcg_enabled() as qtest does not enable icount anymore.
>>
>> * 4/4 (accel stuff to accel):
>>
>>   - add copyright SUSE LLC to files that mostly only consist of the
>>     new interface. Add whatever copyright was in the accelerator code
>>     if instead they mostly consist of accelerator code.
>>
>>   - change a comment to mention the result of the AccelClass experiment
>>
>>   - moved qtest accelerator into accel/qtest/ , make it like the others.
>>
>>   - rename xxx-cpus-interface to xxx-cpus (remove "interface" from names)
>>
>>   - rename accel_int to cpus_accel
>>
>>   - rename CpusAccel functions from cpu_synchronize_* to synchronize_*
>>
>>
>> --------
>>
>> v2 -> v3:
>>
>> * turned into a 4 patch series, adding a first patch moving
>>   softmmu code currently in top_srcdir to softmmu/
>>
>> * cpu-throttle: moved to softmmu/
>>
>> * cpu-timers, icount:
>>
>>   - moved to softmmu/
>>
>>   - fixed assumption of qtest_enabled() => icount_enabled()
>>   causing the failure of check-qtest-arm goal, in test-arm-mptimer.c
>>
>>   Fix is in hw/core/ptimer.c,
>>
>>   where the artificial timeout rate limit should not be applied
>>   under qtest_enabled(), in a similar way to how it is not applied
>>   for icount_enabled().
>>
>> * CpuAccelInterface: no change.
>>
>>
>> --------
>>
>>
>> v1 -> v2:
>>
>> * 1/3 (cpu-throttle): provide a description in the commit message
>>
>> * 2/3 (cpu-timers, icount): in this v2 separate icount from cpu-timers,
>>   as icount is actually TCG-specific. Only build it under CONFIG_TCG.
>>
>>   To do this, qtest had to be detached from icount. To this end, a
>>   trivial global counter for qtest has been introduced.
>>
>> * 3/3 (CpuAccelInterface): provided a description.
>>
>> This is point 8) in that plan. The idea is to extract the unrelated parts
>> in cpus, and register interfaces from each single accelerator to the main
>> cpus module (cpus.c).
>>
>> While doing this RFC, I noticed some assumptions about Windows being
>> either TCG or HAX (not considering WHPX) that might need to be revisited.
>> I added a comment there.
>>
>> The thing builds successfully based on Linux cross-compilations for
>> windows/hax, windows/whpx, and I got a good build on Darwin/hvf.
>>
>> Tests run successully for tcg and kvm configurations, but did not test on
>> windows or darwin.
>>
>> Welcome your feedback and help on this,
>>
>> Claudio
>>
>> Claudio Fontana (3):
>>   softmmu: move softmmu only files from root
>>   cpu-throttle: new module, extracted from cpus.c
>>   cpu-timers, icount: new modules
>>
>>  MAINTAINERS                                  |  15 +-
>>  Makefile.target                              |   7 +-
>>  accel/qtest.c                                |   6 +-
>>  accel/tcg/cpu-exec.c                         |  43 +-
>>  accel/tcg/tcg-all.c                          |   7 +-
>>  accel/tcg/translate-all.c                    |   3 +-
>>  dma-helpers.c                                |   4 +-
>>  docs/replay.txt                              |   6 +-
>>  exec.c                                       |   4 -
>>  hw/core/ptimer.c                             |   8 +-
>>  hw/i386/x86.c                                |   1 +
>>  include/exec/cpu-all.h                       |   4 +
>>  include/exec/exec-all.h                      |   4 +-
>>  include/hw/core/cpu.h                        |  37 --
>>  include/qemu/main-loop.h                     |   5 +
>>  include/qemu/timer.h                         |  22 +-
>>  include/sysemu/cpu-throttle.h                |  68 +++
>>  include/sysemu/cpu-timers.h                  |  81 +++
>>  include/sysemu/cpus.h                        |  12 +-
>>  include/sysemu/qtest.h                       |   2 +
>>  include/sysemu/replay.h                      |   4 +-
>>  migration/migration.c                        |   1 +
>>  migration/ram.c                              |   1 +
>>  replay/replay.c                              |   6 +-
>>  softmmu/Makefile.objs                        |  13 +
>>  arch_init.c => softmmu/arch_init.c           |   0
>>  balloon.c => softmmu/balloon.c               |   0
>>  softmmu/cpu-throttle.c                       | 122 ++++
>>  softmmu/cpu-timers.c                         | 284 +++++++++
>>  cpus.c => softmmu/cpus.c                     | 839 +--------------------------
>>  softmmu/icount.c                             | 499 ++++++++++++++++
>>  ioport.c => softmmu/ioport.c                 |   0
>>  memory.c => softmmu/memory.c                 |   0
>>  memory_mapping.c => softmmu/memory_mapping.c |   0
>>  qtest.c => softmmu/qtest.c                   |  34 +-
>>  softmmu/timers-state.h                       |  69 +++
>>  softmmu/vl.c                                 |   8 +-
>>  stubs/Makefile.objs                          |   3 +-
>>  stubs/clock-warp.c                           |   4 +-
>>  stubs/cpu-get-clock.c                        |   3 +-
>>  stubs/cpu-get-icount.c                       |  21 -
>>  stubs/icount.c                               |  22 +
>>  stubs/qemu-timer-notify-cb.c                 |   8 +
>>  stubs/qtest.c                                |   5 +
>>  target/alpha/translate.c                     |   3 +-
>>  target/arm/helper.c                          |   7 +-
>>  target/riscv/csr.c                           |   8 +-
>>  tests/ptimer-test-stubs.c                    |   7 +-
>>  tests/test-timed-average.c                   |   2 +-
>>  util/main-loop.c                             |   4 +-
>>  util/qemu-timer.c                            |  12 +-
>>  51 files changed, 1343 insertions(+), 985 deletions(-)
>>  create mode 100644 include/sysemu/cpu-throttle.h
>>  create mode 100644 include/sysemu/cpu-timers.h
>>  rename arch_init.c => softmmu/arch_init.c (100%)
>>  rename balloon.c => softmmu/balloon.c (100%)
>>  create mode 100644 softmmu/cpu-throttle.c
>>  create mode 100644 softmmu/cpu-timers.c
>>  rename cpus.c => softmmu/cpus.c (59%)
>>  create mode 100644 softmmu/icount.c
>>  rename ioport.c => softmmu/ioport.c (100%)
>>  rename memory.c => softmmu/memory.c (100%)
>>  rename memory_mapping.c => softmmu/memory_mapping.c (100%)
>>  rename qtest.c => softmmu/qtest.c (95%)
>>  create mode 100644 softmmu/timers-state.h
>>  delete mode 100644 stubs/cpu-get-icount.c
>>  create mode 100644 stubs/icount.c
>>  create mode 100644 stubs/qemu-timer-notify-cb.c
>>
>