[Qemu-devel] [PATCH v8 0/4] target-arm: ARM64: Adding EL1 AARCH32 guest support

[Greg Bellows]

Added support for running an AArch32 guest on a AArch64 KVM host.  Support has
only been added to the QEMU machvirt machine.  The addition of CPU properties
specifiable from the command line were added to allow disablement of AArch64
execution state hereby forcing EL1 to be AArch32.  The new CPU command line
property is "aarch64=on/off" that is specified as follows:

    aarch64-softmmu/qemu-system-aarch64 -M virt -cpu cortex-a57,aarch64=off ...

---

v7 -> v8
- Fix patch 4 dynamic_cast object

v6 -> v7
- Fix comment issues

v5 -> v6
- Reorder conditionals in 64_to_32 for readability.

v3 -> v4
- Move and fix sync functions to properly handle current EL/PL
- Replace use of strtok
- Add disablement of aarch64 option if KVM disabled
- Revert and update AArch64 check on vcpu init to not check for AARch64 feature
  but rather AArch64 family type.
- Relocate register sync on get
- add missing env->aarch64 refresh after pstate fetch

v2 -> v3
- Fix KVM64/AArch64 hang by conditionalizing register sync
- Conditionalize 64-bit interrupt handler setting of aarch64

v1 -> v2
- Replaced custom property parsing with use of generic CPU property parser
- Added CPU property registration
- Fixed mulitple property handling in virt.c
- Removed unnecessary kernel load changes

Greg Bellows (4):
  target-arm: Add CPU property to disable AArch64
  target-arm: Add feature parsing to virt
  target-arm: Add 32/64-bit register sync
  target-arm: Add AArch32 guest support to KVM64

 hw/arm/virt.c           |  20 ++++-
 target-arm/cpu.c        |   5 +-
 target-arm/cpu.h        |   2 +
 target-arm/cpu64.c      |  39 +++++++++
 target-arm/helper-a64.c |   5 +-
 target-arm/helper.c     | 211 ++++++++++++++++++++++++++++++++++++++++++++++++
 target-arm/kvm64.c      |  36 ++++++++-
 target-arm/op_helper.c  |   6 +-
 8 files changed, 309 insertions(+), 15 deletions(-)

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1.8.3.2