[Qemu-devel] [PACTH v4 0/6] ARM: add PSCI 0.2 support in TCG mode

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

This series adds PSCI support to ARM and AArch64 system emulation when running
in TCG mode. As PSCI calls can be made using either hypervisor call (HVC) or
secure monitor call (SMC) instructions, support is added for handling those
in patch #3 before patch #5 adds the actual PSCI dispatch logic. Patch #6
enables PSCI for the mach-virt platform.

Changes since v3:
- added some R-b's
- remove user mode interrupt handler for AArch32 as well
- update the SMC and HVC handling logic to
  . take feature bits for EL2 and EL3 into account
  . deal with conditional execution state in A32/T32
  . add ARCH() and IS_USER()/current_pl tests where appropriate
- added some missing () in the PSCI constants
- update the PSCI dispatch logic to
  . CPU_ON: take bit 0 of the entry point into account to either set the Thumb
    state or return an error, and assert that the onlined CPU is in the same
    mode as the calling CPU
  . CPU_OFF: call cpu_loop_exit() directly
  . CPU_SUSPEND; use helper_wfi()
  . follow the PSCI spec and adopt the name 'conduit' to refer to the type of
    instruction used to invoke PSCI functions
  . check the conduit in the translation stage to avoid advancing the single
    step state machine inadvertently
- remove smp restriction from mach-virt running in TCG mode

Changes since v2:
- added path #4 to introduce QEMU counterparts of the kernel PSCI constants we
  refer to in the PSCI emulation, this is needed so QEMU can be built in
  environments that don't supply the PSCI header file.

Changes since v1:
- processed first round of review, that was already given when this series was
  sent out by Rob himself back in May


*** BLURB HERE ***

Ard Biesheuvel (1):
  target-arm: add missing PSCI constants needed for PSCI emulation

Rob Herring (5):
  target-arm: add powered off cpu state
  target-arm: do not set do_interrupt handlers for ARM and AArch64 user
    modes
  target-arm: add hvc and smc exception emulation handling
    infrastructure
  target-arm: add emulation of PSCI calls for system emulation
  arm/virt: enable PSCI emulation support for system emulation

 hw/arm/virt.c              |  82 ++++++++++----------
 target-arm/Makefile.objs   |   1 +
 target-arm/cpu-qom.h       |  11 +++
 target-arm/cpu.c           |  19 +++--
 target-arm/cpu.h           |   8 ++
 target-arm/cpu64.c         |   2 +
 target-arm/helper-a64.c    |  19 +++++
 target-arm/helper.c        |  40 ++++++++--
 target-arm/internals.h     |  20 +++++
 target-arm/kvm-consts.h    |  40 ++++++++++
 target-arm/machine.c       |   5 +-
 target-arm/psci.c          | 183 +++++++++++++++++++++++++++++++++++++++++++++
 target-arm/translate-a64.c |  38 +++++++---
 target-arm/translate.c     |  59 ++++++++++++---
 target-arm/translate.h     |   4 +
 15 files changed, 455 insertions(+), 76 deletions(-)
 create mode 100644 target-arm/psci.c

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1.8.3.2