[PATCH for 8.0 v5 00/20] use MemTxAttrs to avoid current_cpu in hw/

[Alex Bennée]

Hi,

This series attempts to improve the modelling of non-CPU writes to
peripherals by expanding the MemTxAttrs to carry more details about
the requester. There are only 3 requester types, the CPU, the PCI bus
and the MACHINE. The last is intended for machine specific buses and
leaves the details of how to decode that information to machine
specific code.

I've extended this beyond just being an Arm only experiment and into
some other machine types. Perhaps the most complicated bit was
tweaking the modelling of the IOAPIC/APIC which gave me the first use
of MTRT_MACHINE (although we don't fully validate the source we do now
correctly drop CPU accesses to the APIC MSI region).

The longer term goal will be to eliminate all the legacy mem
read/write functions and use MemTxAttrs everywhere.

The final patch deprecates the use of current_cpu in hw/ for new code
as a comment. What do people think?

Based-on: 20221111145529.4020801-1-alex.bennee@linaro.org

Alex Bennée (20):
  hw: encode accessing CPU index in MemTxAttrs
  target/arm: ensure TCG IO accesses set appropriate MemTxAttrs
  target/arm: ensure HVF traps set appropriate MemTxAttrs
  target/arm: ensure KVM traps set appropriate MemTxAttrs
  target/arm: ensure m-profile helpers set appropriate MemTxAttrs
  qtest: make read/write operation appear to be from CPU
  hw/intc/gic: use MxTxAttrs to divine accessing CPU
  hw/timer: convert mptimer access to attrs to derive cpu index
  hw/arm: remove current_cpu hack from pxa2xx access
  target/microblaze: initialise MemTxAttrs for CPU access
  target/sparc: initialise MemTxAttrs for CPU access
  target/riscv: initialise MemTxAttrs for CPU access
  target/i386: add explicit initialisation for MexTxAttrs
  hw/audio: explicitly set .requester_type for intel-hda
  hw/i386: update vapic_write to use MemTxAttrs
  include: add MEMTXATTRS_MACHINE helper
  hw/intc: properly model IOAPIC MSI messages
  hw/i386: convert apic access to use MemTxAttrs
  hw/isa: derive CPUState from MemTxAttrs in apm_ioport_writeb
  include/hw: add commentary to current_cpu export

 include/exec/memattrs.h           |  76 +++++++++++---
 include/hw/core/cpu.h             |  14 +++
 include/hw/i386/apic.h            |   2 +-
 include/hw/i386/ioapic_internal.h |   2 +
 include/hw/isa/apm.h              |   2 +-
 target/i386/cpu.h                 |   4 +-
 hw/acpi/ich9.c                    |   1 -
 hw/acpi/piix4.c                   |   2 +-
 hw/arm/pxa2xx.c                   |   2 +-
 hw/audio/intel-hda.c              |   2 +-
 hw/i386/amd_iommu.c               |   6 +-
 hw/i386/intel_iommu.c             |   2 +-
 hw/i386/kvmvapic.c                |  19 ++--
 hw/i386/x86.c                     |  11 +--
 hw/intc/apic.c                    |  62 ++++++++----
 hw/intc/arm_gic.c                 | 159 +++++++++++++++++++-----------
 hw/intc/ioapic.c                  |  35 +++++--
 hw/isa/apm.c                      |  21 +++-
 hw/isa/lpc_ich9.c                 |   5 +-
 hw/misc/tz-mpc.c                  |   2 +-
 hw/misc/tz-msc.c                  |   6 +-
 hw/pci/pci.c                      |   4 +-
 hw/timer/arm_mptimer.c            |  49 ++++++---
 softmmu/qtest.c                   |  26 ++---
 target/arm/hvf/hvf.c              |   4 +-
 target/arm/kvm.c                  |   9 +-
 target/arm/m_helper.c             |  12 +--
 target/arm/ptw.c                  |   3 +-
 target/arm/tlb_helper.c           |   2 +-
 target/i386/hax/hax-all.c         |   2 +-
 target/i386/nvmm/nvmm-all.c       |   2 +-
 target/i386/sev.c                 |   2 +-
 target/i386/whpx/whpx-all.c       |   2 +-
 target/microblaze/helper.c        |   4 +-
 target/riscv/cpu_helper.c         |   2 +-
 target/sparc/mmu_helper.c         |   6 +-
 36 files changed, 370 insertions(+), 194 deletions(-)

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2.34.1