[v3,00/17] make system memory API available for common code

Message

Pierrick Bouvier March 11, 2025, 7:57 p.m. UTC

The main goal of this series is to be able to call any memory ld/st function
from code that is *not* target dependent. As a positive side effect, we can
turn related system compilation units into common code.

The first 5 patches remove dependency of memory API to cpu headers and remove
dependency to target specific code. This could be a series on its own, but it's
great to be able to turn system memory compilation units into common code to
make sure it can't regress, and prove it achieves the desired result.

The next patches remove more dependencies on cpu headers (exec-all,
memory-internal, ram_addr).
Then, we add access to a needed function from kvm, some xen stubs, and we
finally can turn our compilation units into common code.

Every commit was tested to build correctly for all targets (on windows, linux,
macos), and the series was fully tested by running all tests we have (linux,
x86_64 host).

v2:
- reorder first commits (tswap change first, so memory cached functions can use it)
- move st/ld*_p functions to tswap instead of bswap
- add define for target_words_bigendian when COMPILING_PER_TARGET, equals to
  TARGET_BIG_ENDIAN (avoid overhead in target code)
- rewrite devend_memop
- remove useless exec-all.h in concerned patch
- extract devend_big_endian function to reuse in system/memory.c
- rewrite changes to system/memory.c

v3:
- move devend functions to memory_internal.h
- completed description for commits removing cpu.h dependency

Pierrick Bouvier (17):
  exec/tswap: target code can use TARGET_BIG_ENDIAN instead of
    target_words_bigendian()
  exec/tswap: implement {ld,st}.*_p as functions instead of macros
  exec/memory_ldst: extract memory_ldst declarations from cpu-all.h
  exec/memory_ldst_phys: extract memory_ldst_phys declarations from
    cpu-all.h
  exec/memory.h: make devend_memop "target defines" agnostic
  codebase: prepare to remove cpu.h from exec/exec-all.h
  exec/exec-all: remove dependency on cpu.h
  exec/memory-internal: remove dependency on cpu.h
  exec/ram_addr: remove dependency on cpu.h
  system/kvm: make kvm_flush_coalesced_mmio_buffer() accessible for
    common code
  exec/ram_addr: call xen_hvm_modified_memory only if xen is enabled
  hw/xen: add stubs for various functions
  system/physmem: compilation unit is now common to all targets
  include/exec/memory: extract devend_big_endian from devend_memop
  include/exec/memory: move devend functions to memory-internal.h
  system/memory: make compilation unit common
  system/ioport: make compilation unit common

 include/exec/cpu-all.h              | 66 -----------------------
 include/exec/exec-all.h             |  1 -
 include/exec/memory-internal.h      | 21 +++++++-
 include/exec/memory.h               | 30 ++++-------
 include/exec/ram_addr.h             | 11 ++--
 include/exec/tswap.h                | 81 +++++++++++++++++++++++++++--
 include/system/kvm.h                |  6 +--
 include/tcg/tcg-op.h                |  1 +
 target/ppc/helper_regs.h            |  2 +
 include/exec/memory_ldst.h.inc      |  4 --
 include/exec/memory_ldst_phys.h.inc |  5 +-
 cpu-target.c                        |  1 +
 hw/ppc/spapr_nested.c               |  1 +
 hw/sh4/sh7750.c                     |  1 +
 hw/xen/xen_stubs.c                  | 56 ++++++++++++++++++++
 page-vary-target.c                  |  2 +-
 system/ioport.c                     |  1 -
 system/memory.c                     | 17 ++----
 target/riscv/bitmanip_helper.c      |  2 +-
 hw/xen/meson.build                  |  3 ++
 system/meson.build                  |  6 +--
 21 files changed, 192 insertions(+), 126 deletions(-)
 create mode 100644 hw/xen/xen_stubs.c