[RFC v9 00/22] i386 cleanup

[Claudio Fontana <cfontana@suse.de>]

v8 -> v9: move additional methods to CPUClass->tcg_ops

do_unaligned_access, transaction_failed and do_interrupt.

do_interrupt is a bit tricky, as the same code is reused
(albeit not usually directly) for KVM under certain odd conditions.

Change arm, as the only user of do_interrupt callback for KVM,
to instead call the target function directly arm_do_interrupt.

v7 -> v8: add missing CONFIG_TCGs, fix bugs

* add the prerequisite patches for "3 tcg" at the beginning of the
  series for convenience (already reviewed, queued by RH).

* add CONFIG_TCG to TCGCpuOperations and tcg_ops variable use

* reduce the scope of the realizefn refactoring, do not
  introduce a separate cpu_accel_realize, and instead use the
  existing cpu_exec_realizefn, there is not enough benefit
  to introduce a new function.

* fix bugs in user mode due to attempt to move the tcg_region_init()
  early, so it could be done just once in tcg_init() for both
  softmmu and user mode. Unfortunately it needs to remain deferred
  for user mode, as it needs to be done after prologue init and
  after the GUEST_BASE has been set.

v6 -> v7: integrate TCGCpuOperations, refactored cpu_exec_realizefn

* integrate TCGCpuOperations (Eduardo)

Taken some refactoring from Eduardo for Tcg-only operations on
CPUClass.

* refactored cpu_exec_realizefn

The other main change is a refactoring of cpu_exec_realizefn,
directly linked to the effort of making many cpu_exec operations
TCG-only (Eduardo series above):

cpu_exec_realizefn is actually a TCG-only thing, with the
exception of a couple things that can be done in base cpu code.

This changes all targets realizefn, so I guess I have to Cc:
the Multiverse? (Universe was already CCed for all accelerators).


v5 -> v6: remove MODULE_INIT_ACCEL_CPU


instead, use a call to accel_init_interfaces().

* The class lookups are now general and performed in accel/

  new AccelCPUClass for new archs are supported as new
  ones appear in the class hierarchy, no need for stubs.

* Split the code a bit better


v4 -> v5: centralized and simplified initializations

I put in Cc: Emilio G. Cota, specifically because in patch 8
I (re)moved for user-mode the call to tcg_regions_init().

The call happens now inside the tcg AccelClass machine_init,
(so earlier). This seems to work fine, but thought to get the
author opinion on this.

Rebased on "tcg-cpus: split into 3 tcg variants" series
(queued by Richard), to avoid some code churn:


https://lists.gnu.org/archive/html/qemu-devel/2020-10/msg04356.html


* Extended AccelClass to user-mode.

user-mode now does not call tcg_exec_init directly,
instead it uses the tcg accel class, and its init_machine method.

Since user-mode does not define or use a machine state,
the machine is just passed as NULL.

The immediate advantage is that now we can call current_accel()
from both user mode and softmmu, so we can work out the correct
class to use for accelerator initializations.

* QOMification of CpusAccelOps

simple QOMification of CpusAccelOps abstract class.

* Centralized all accel_cpu_init, so only one per cpu-arch,
  plus one for all accels will remain.

  So we can expect accel_cpu_init() to be limited to:
  
  softmmu/cpus.c - initializes the chosen softmmu accel ops for the cpus module.
  target/ARCH/cpu.c - initializes the chosen arch-specific cpu accelerator.
  
These changes are meant to address concerns/issues (Paolo):

1) the use of if (tcg_enabled()) and similar in the module_init call path

2) the excessive number of accel_cpu_init() to hunt down in the codebase.


* Fixed wrong use of host_cpu_class_init (Eduardo)


v3 -> v4: QOMification of X86CPUAccelClass


In this version I basically QOMified X86CPUAccel, taking the
suggestions from Eduardo as the starting point,
but stopping just short of making it an actual QOM interface,
using a plain abstract class, and then subclasses for the
actual objects.

Initialization is still using the existing qemu initialization
framework (module_call_init), which is I still think is better
than the alternatives proposed, in the current state.

Possibly some improvements could be developed in the future here.
In this case, effort should be put in keeping things extendible,
in order not to be blocked once accelerators also become modules.

Motivation and higher level steps:

https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg04628.html

Looking forward to your comments on this proposal,

Ciao,

Claudio


Claudio Fontana (23):
  accel/tcg: split CpusAccel into three TCG variants
  accel/tcg: split tcg_start_vcpu_thread
  accel/tcg: rename tcg-cpus functions to match module name
  i386: move kvm accel files into kvm/
  i386: move whpx accel files into whpx/
  i386: move hax accel files into hax/
  i386: hvf: remove stale MAINTAINERS entry for old hvf stubs
  i386: move TCG accel files into tcg/
  i386: move cpu dump out of helper.c into cpu-dump.c
  i386: move TCG cpu class initialization out of helper.c
  target/riscv: remove CONFIG_TCG, as it is always TCG
  accel/tcg: split TCG-only code from cpu_exec_realizefn
  target/arm: do not use cc->do_interrupt for KVM directly
  cpu: move cc->do_interrupt to tcg_ops
  cpu: move cc->transaction_failed to tcg_ops
  cpu: move do_unaligned_access to tcg_ops
  accel: extend AccelState and AccelClass to user-mode
  accel: replace struct CpusAccel with AccelOpsClass
  accel: introduce AccelCPUClass extending CPUClass
  i386: split cpu accelerators from cpu.c, using AccelCPUClass
  cpu: call AccelCPUClass::cpu_realizefn in cpu_exec_realizefn
  hw/core/cpu: call qemu_init_vcpu in cpu_common_realizefn
  cpu: introduce cpu_accel_instance_init

Eduardo Habkost (9):
  tcg: cpu_exec_{enter,exit} helpers
  tcg: make CPUClass.cpu_exec_* optional
  tcg: Make CPUClass.debug_excp_handler optional
  cpu: Remove unnecessary noop methods
  cpu: Introduce TCGCpuOperations struct
  cpu: Move synchronize_from_tb() to tcg_ops
  cpu: Move cpu_exec_* to tcg_ops
  cpu: Move tlb_fill to tcg_ops
  cpu: Move debug_excp_handler to tcg_ops

 MAINTAINERS                           |  19 +-
 accel/accel-common.c                  | 105 +++++
 accel/{accel.c => accel-softmmu.c}    |  60 +--
 accel/accel-softmmu.h                 |  15 +
 accel/accel-user.c                    |  24 ++
 accel/kvm/kvm-all.c                   |   2 -
 accel/kvm/kvm-cpus.c                  |  26 +-
 accel/kvm/kvm-cpus.h                  |   2 -
 accel/meson.build                     |   4 +-
 accel/qtest/qtest.c                   |  25 +-
 accel/tcg/cpu-exec.c                  |  70 +++-
 accel/tcg/cputlb.c                    |   6 +-
 accel/tcg/meson.build                 |   9 +-
 accel/tcg/tcg-all.c                   |  14 +-
 accel/tcg/tcg-cpus-icount.c           | 138 +++++++
 accel/tcg/tcg-cpus-icount.h           |  19 +
 accel/tcg/tcg-cpus-mttcg.c            | 134 +++++++
 accel/tcg/tcg-cpus-mttcg.h            |  19 +
 accel/tcg/tcg-cpus-rr.c               | 298 ++++++++++++++
 accel/tcg/tcg-cpus-rr.h               |  21 +
 accel/tcg/tcg-cpus.c                  | 539 +++-----------------------
 accel/tcg/tcg-cpus.h                  |   8 +-
 accel/tcg/user-exec.c                 |   6 +-
 accel/xen/xen-all.c                   |  24 +-
 bsd-user/main.c                       |  11 +-
 cpu.c                                 |  71 ++--
 hw/core/cpu.c                         |  30 +-
 hw/i386/fw_cfg.c                      |   2 +-
 hw/i386/intel_iommu.c                 |   2 +-
 hw/i386/kvm/apic.c                    |   2 +-
 hw/i386/kvm/clock.c                   |   2 +-
 hw/i386/microvm.c                     |   2 +-
 hw/i386/pc.c                          |   2 +-
 hw/i386/pc_piix.c                     |   1 +
 hw/i386/x86.c                         |   2 +-
 hw/mips/jazz.c                        |   4 +-
 include/hw/boards.h                   |   2 +-
 include/hw/core/accel-cpu.h           |  25 ++
 include/hw/core/cpu.h                 |  92 ++---
 include/hw/core/tcg-cpu-ops.h         |  75 ++++
 include/{sysemu => qemu}/accel.h      |  16 +-
 include/sysemu/accel-ops.h            |  45 +++
 include/sysemu/cpus.h                 |  26 +-
 include/sysemu/hvf.h                  |   2 +-
 include/sysemu/kvm.h                  |   2 +-
 include/sysemu/kvm_int.h              |   2 +-
 linux-user/main.c                     |   7 +-
 meson.build                           |   1 +
 softmmu/cpus.c                        |  12 +-
 softmmu/icount.c                      |   2 +-
 softmmu/memory.c                      |   2 +-
 softmmu/qtest.c                       |   2 +-
 softmmu/vl.c                          |   8 +-
 target/alpha/cpu.c                    |  18 +-
 target/arm/cpu.c                      |  26 +-
 target/arm/cpu64.c                    |   5 +-
 target/arm/cpu_tcg.c                  |   8 +-
 target/arm/helper.c                   |   4 +
 target/arm/kvm64.c                    |   4 +-
 target/avr/cpu.c                      |  13 +-
 target/avr/helper.c                   |   4 +-
 target/cris/cpu.c                     |  30 +-
 target/cris/helper.c                  |   4 +-
 target/hppa/cpu.c                     |  15 +-
 target/i386/cpu-dump.c                | 537 +++++++++++++++++++++++++
 target/i386/cpu.c                     | 418 ++------------------
 target/i386/cpu.h                     | 120 +-----
 target/i386/{ => hax}/hax-all.c       |   5 +-
 target/i386/{ => hax}/hax-cpus.c      |  29 +-
 target/i386/{ => hax}/hax-cpus.h      |   2 -
 target/i386/{ => hax}/hax-i386.h      |   6 +-
 target/i386/{ => hax}/hax-interface.h |   0
 target/i386/{ => hax}/hax-mem.c       |   0
 target/i386/{ => hax}/hax-posix.c     |   0
 target/i386/{ => hax}/hax-posix.h     |   0
 target/i386/{ => hax}/hax-windows.c   |   0
 target/i386/{ => hax}/hax-windows.h   |   0
 target/i386/hax/meson.build           |   7 +
 target/i386/helper-tcg.h              | 112 ++++++
 target/i386/helper.c                  | 539 +-------------------------
 target/i386/host-cpu.c                | 198 ++++++++++
 target/i386/host-cpu.h                |  19 +
 target/i386/hvf/cpu.c                 |  65 ++++
 target/i386/hvf/hvf-cpus.c            |  27 +-
 target/i386/hvf/hvf-cpus.h            |   2 -
 target/i386/hvf/hvf-i386.h            |   2 +-
 target/i386/hvf/hvf.c                 |   3 +-
 target/i386/hvf/meson.build           |   1 +
 target/i386/hvf/x86_task.c            |   2 +-
 target/i386/kvm/cpu.c                 | 148 +++++++
 target/i386/{ => kvm}/hyperv-proto.h  |   0
 target/i386/{ => kvm}/hyperv-stub.c   |   0
 target/i386/{ => kvm}/hyperv.c        |   0
 target/i386/{ => kvm}/hyperv.h        |   0
 target/i386/kvm/kvm-cpu.h             |  41 ++
 target/i386/{ => kvm}/kvm-stub.c      |   0
 target/i386/{ => kvm}/kvm.c           |   3 +-
 target/i386/{ => kvm}/kvm_i386.h      |   0
 target/i386/kvm/meson.build           |   8 +
 target/i386/kvm/trace-events          |   7 +
 target/i386/kvm/trace.h               |   1 +
 target/i386/machine.c                 |   4 +-
 target/i386/meson.build               |  39 +-
 target/i386/{ => tcg}/bpt_helper.c    |   1 +
 target/i386/{ => tcg}/cc_helper.c     |   1 +
 target/i386/tcg/cpu.c                 | 173 +++++++++
 target/i386/{ => tcg}/excp_helper.c   |   1 +
 target/i386/{ => tcg}/fpu_helper.c    |  33 +-
 target/i386/{ => tcg}/int_helper.c    |   1 +
 target/i386/{ => tcg}/mem_helper.c    |   1 +
 target/i386/tcg/meson.build           |  14 +
 target/i386/{ => tcg}/misc_helper.c   |   1 +
 target/i386/{ => tcg}/mpx_helper.c    |   1 +
 target/i386/{ => tcg}/seg_helper.c    |   1 +
 target/i386/{ => tcg}/smm_helper.c    |   2 +
 target/i386/{ => tcg}/svm_helper.c    |   1 +
 target/i386/{ => tcg}/tcg-stub.c      |   0
 target/i386/{ => tcg}/translate.c     |   1 +
 target/i386/trace-events              |   6 -
 target/i386/whpx/meson.build          |   4 +
 target/i386/{ => whpx}/whp-dispatch.h |   0
 target/i386/{ => whpx}/whpx-all.c     |   4 +-
 target/i386/{ => whpx}/whpx-cpus.c    |  29 +-
 target/i386/{ => whpx}/whpx-cpus.h    |   2 -
 target/lm32/cpu.c                     |  13 +-
 target/m68k/cpu.c                     |  12 +-
 target/microblaze/cpu.c               |  23 +-
 target/mips/cpu.c                     |  21 +-
 target/moxie/cpu.c                    |  10 +-
 target/nios2/cpu.c                    |  14 +-
 target/openrisc/cpu.c                 |  12 +-
 target/ppc/translate_init.c.inc       |  23 +-
 target/riscv/cpu.c                    |  25 +-
 target/rx/cpu.c                       |  18 +-
 target/s390x/cpu.c                    |  15 +-
 target/sh4/cpu.c                      |  14 +-
 target/sparc/cpu.c                    |  18 +-
 target/tilegx/cpu.c                   |  10 +-
 target/tricore/cpu.c                  |   8 +-
 target/unicore32/cpu.c                |  14 +-
 target/xtensa/cpu.c                   |  16 +-
 141 files changed, 3007 insertions(+), 2051 deletions(-)
 create mode 100644 accel/accel-common.c
 rename accel/{accel.c => accel-softmmu.c} (64%)
 create mode 100644 accel/accel-softmmu.h
 create mode 100644 accel/accel-user.c
 create mode 100644 accel/tcg/tcg-cpus-icount.c
 create mode 100644 accel/tcg/tcg-cpus-icount.h
 create mode 100644 accel/tcg/tcg-cpus-mttcg.c
 create mode 100644 accel/tcg/tcg-cpus-mttcg.h
 create mode 100644 accel/tcg/tcg-cpus-rr.c
 create mode 100644 accel/tcg/tcg-cpus-rr.h
 create mode 100644 include/hw/core/accel-cpu.h
 create mode 100644 include/hw/core/tcg-cpu-ops.h
 rename include/{sysemu => qemu}/accel.h (94%)
 create mode 100644 include/sysemu/accel-ops.h
 create mode 100644 target/i386/cpu-dump.c
 rename target/i386/{ => hax}/hax-all.c (99%)
 rename target/i386/{ => hax}/hax-cpus.c (71%)
 rename target/i386/{ => hax}/hax-cpus.h (95%)
 rename target/i386/{ => hax}/hax-i386.h (95%)
 rename target/i386/{ => hax}/hax-interface.h (100%)
 rename target/i386/{ => hax}/hax-mem.c (100%)
 rename target/i386/{ => hax}/hax-posix.c (100%)
 rename target/i386/{ => hax}/hax-posix.h (100%)
 rename target/i386/{ => hax}/hax-windows.c (100%)
 rename target/i386/{ => hax}/hax-windows.h (100%)
 create mode 100644 target/i386/hax/meson.build
 create mode 100644 target/i386/helper-tcg.h
 create mode 100644 target/i386/host-cpu.c
 create mode 100644 target/i386/host-cpu.h
 create mode 100644 target/i386/hvf/cpu.c
 create mode 100644 target/i386/kvm/cpu.c
 rename target/i386/{ => kvm}/hyperv-proto.h (100%)
 rename target/i386/{ => kvm}/hyperv-stub.c (100%)
 rename target/i386/{ => kvm}/hyperv.c (100%)
 rename target/i386/{ => kvm}/hyperv.h (100%)
 create mode 100644 target/i386/kvm/kvm-cpu.h
 rename target/i386/{ => kvm}/kvm-stub.c (100%)
 rename target/i386/{ => kvm}/kvm.c (99%)
 rename target/i386/{ => kvm}/kvm_i386.h (100%)
 create mode 100644 target/i386/kvm/meson.build
 create mode 100644 target/i386/kvm/trace-events
 create mode 100644 target/i386/kvm/trace.h
 rename target/i386/{ => tcg}/bpt_helper.c (99%)
 rename target/i386/{ => tcg}/cc_helper.c (99%)
 create mode 100644 target/i386/tcg/cpu.c
 rename target/i386/{ => tcg}/excp_helper.c (99%)
 rename target/i386/{ => tcg}/fpu_helper.c (99%)
 rename target/i386/{ => tcg}/int_helper.c (99%)
 rename target/i386/{ => tcg}/mem_helper.c (99%)
 create mode 100644 target/i386/tcg/meson.build
 rename target/i386/{ => tcg}/misc_helper.c (99%)
 rename target/i386/{ => tcg}/mpx_helper.c (99%)
 rename target/i386/{ => tcg}/seg_helper.c (99%)
 rename target/i386/{ => tcg}/smm_helper.c (99%)
 rename target/i386/{ => tcg}/svm_helper.c (99%)
 rename target/i386/{ => tcg}/tcg-stub.c (100%)
 rename target/i386/{ => tcg}/translate.c (99%)
 create mode 100644 target/i386/whpx/meson.build
 rename target/i386/{ => whpx}/whp-dispatch.h (100%)
 rename target/i386/{ => whpx}/whpx-all.c (99%)
 rename target/i386/{ => whpx}/whpx-cpus.c (73%)
 rename target/i386/{ => whpx}/whpx-cpus.h (96%)

-- 
2.26.2