CPUAddressSpace structures are currently allocated statically in
cpu_address_space_init(). This approach is clunky to use because
cpu->num_ases needs to be set immediately before the function is called.

Moreover, the static allocation is tightly coupled to the Address Space
(AS) indexes, which, depending on the CPU features, can leave unused
CPUAddressSpace structures.

For instance, on aarch64's 'virt' machine, if secure=off but mte=on,
three ASes are allocated, but only two ASes (ARMASIdx_NS and
ARMASIdx_Tag) are actually used.

This situation gets worse when new CPU features that require additional
ASes are added, such as FEAT_MEC (which I'm working on right now).

This series addresses these limitations by allocating the
CPUAddressSpace dynamically.

The last 4 patches in the series probably need to get squashed with the
changes in the API, but I kept them separate so it's easy to see how
simple the changes needed on the target side are.

CI results:

https://gitlab.com/gusbromero/qemu/-/pipelines/2184288007 


Cheers,
Gustavo

Gustavo Romero (6):
  system/physmem: Enhance the Address Space API
  target/arm: Initialize AS 0 first
  target/arm: Add a _MAX sentinel to ARMASIdx enum
  target/arm: Use new CPU address space API
  target/i386: Add a _MAX sentinel to X86ASIdx enum
  target/i386: Use new CPU address space API

 include/exec/cpu-common.h          | 16 +++++++--
 include/hw/core/cpu.h              |  6 +++-
 stubs/cpu-destroy-address-spaces.c |  2 +-
 system/cpus.c                      |  4 +--
 system/physmem.c                   | 56 ++++++++++++++++++++++--------
 target/arm/cpu.c                   | 20 ++++-------
 target/arm/cpu.h                   |  1 +
 target/i386/cpu.h                  |  1 +
 target/i386/kvm/kvm-cpu.c          |  4 +--
 target/i386/kvm/kvm.c              |  4 +--
 target/i386/tcg/system/tcg-cpu.c   |  6 ++--
 11 files changed, 78 insertions(+), 42 deletions(-)

-- 
2.34.1