[00/22] exec/cpu: Call cpu_exec_realizefn() once in cpu_common_realize()

Message

Philippe Mathieu-Daudé Sept. 18, 2023, 4:02 p.m. UTC

Hi,

TL;DR: This series factor duplicated common code in CPUs
DeviceRealize() handlers out, moving as a single call in
cpu_common_realize().

In an effort to have most of:
- CPU core code independant of accelerators
- CPU core code target agnostic
- CPU target code independant of accelerators
- and cpu_reset() called automatically without having to
  rely on global QEMUResetHandler,
I'm working on the core CPU code, unfortunately touching
files in all targets.

I suppose them term "exec" used in various areas of QEMU
started from what we call today "accel[erators]" [*]. So
cpu_exec_realizefn() can be read as cpu_accel_realize(),
or "generic code where an accelerator realizes its internal
fields on an abstract (target independent) CPU".

This series moves a common pattern used in all target's
cpu_realize() handlers to the common cpu_exec_realizefn().

Some optional code is used to check CPU requested features
are compatible with the accelerator possibilities. We
extracted this code as CPUClass::verify_accel_features()
handler. Better name welcomed :)

Some targets were calling cpu_reset() *before*
cpu_common_realizefn(), we moved it *after* (since RESET
shouldn't happen before REALIZE). I still have to audit
each target to confirm there are no side effects.
Besides this cpu_reset() change, the rest should be
relatively trivial to review, still I'd like feedback
from the respective target maintainers for the "move HW
creation after vCPU one" patches.

Regards,

Phil.

Follow-up: Make cpu_reset() accel-agnostic and move it
           to cpu_common_realize() (not trivial due to
           KVM run_on_cpu() calls).

[*] If Paolo/Richard confirm, I might post series renaming
    various APIs s/exec/accel/, because various headers
    meaning aren't clear to me.

Philippe Mathieu-Daudé (21):
  target/i386: Only realize existing APIC device
  hw/intc/apic: Pass CPU using QOM link property
  target/i386/kvm: Correct comment in kvm_cpu_realize()
  exec/cpu: Never call cpu_reset() before cpu_realize()
  exec/cpu: Call qemu_init_vcpu() once in cpu_common_realize()
  exec/cpu: Call cpu_remove_sync() once in cpu_common_unrealize()
  exec/cpu: RFC Destroy vCPU address spaces in cpu_common_unrealize()
  target/arm: Create timers *after* accelerator vCPU is realized
  target/hppa: Create timer *after* accelerator vCPU is realized
  target/nios2: Create IRQs *after* accelerator vCPU is realized
  target/mips: Create clock *after* accelerator vCPU is realized
  target/xtensa: Create IRQs *after* accelerator vCPU is realized
  target/sparc: Init CPU environment *after* accelerator vCPU is
    realized
  exec/cpu: Introduce CPUClass::verify_accel_features()
  target/arm: Extract verify_accel_features() from cpu_realize()
  target/i386: Extract verify_accel_features() from cpu_realize()
  target/s390x: Call s390_cpu_realize_sysemu from s390_realize_cpu_model
  target/s390x: Have s390_realize_cpu_model() return a boolean
  target/s390x: Use s390_realize_cpu_model() as verify_accel_features()
  exec/cpu: Have cpu_exec_realize() return a boolean
  exec/cpu: Call cpu_exec_realizefn() once in cpu_common_realize()

xianglai li (1):
  exec/cpu: Introduce the CPU address space destruction function

 include/exec/cpu-common.h     |  8 ++++
 include/hw/core/cpu.h         |  7 +++-
 target/s390x/s390x-internal.h |  4 +-
 cpu.c                         | 11 ++++-
 hw/core/cpu-common.c          | 15 +++++++
 hw/intc/apic_common.c         |  2 +
 softmmu/physmem.c             | 24 +++++++++++
 target/alpha/cpu.c            | 10 -----
 target/arm/cpu.c              | 53 ++++++++++++------------
 target/avr/cpu.c              | 10 +----
 target/cris/cpu.c             | 11 +----
 target/hexagon/cpu.c          | 11 +----
 target/hppa/cpu.c             | 20 ++-------
 target/i386/cpu-sysemu.c      | 20 ++++-----
 target/i386/cpu.c             | 77 ++++++++++++++++++-----------------
 target/i386/kvm/kvm-cpu.c     |  3 +-
 target/loongarch/cpu.c        | 11 +----
 target/m68k/cpu.c             | 11 +----
 target/microblaze/cpu.c       |  9 ----
 target/mips/cpu.c             | 27 ++++--------
 target/nios2/cpu.c            | 20 +++------
 target/openrisc/cpu.c         | 11 +----
 target/ppc/cpu_init.c         |  8 ----
 target/riscv/cpu.c            | 10 +----
 target/rx/cpu.c               | 11 +----
 target/s390x/cpu-sysemu.c     |  3 +-
 target/s390x/cpu.c            | 21 +---------
 target/s390x/cpu_models.c     | 16 +++++---
 target/sh4/cpu.c              | 11 +----
 target/sparc/cpu.c            | 10 -----
 target/tricore/cpu.c          | 10 +----
 target/xtensa/cpu.c           | 13 +-----
 32 files changed, 189 insertions(+), 299 deletions(-)