[Qemu-devel] [RFC 00/10] MTTCG: Slow-path for atomic insns

[Alvise Rigo <a.rigo@virtualopensystems.com>]

Hi,

This series ports the latest iteration of the LL/SC work on top of the
latest MTTCG reference branch posted recently by Alex.

These patches apply on top of the following series:

- [RFC v1 00/12] Enable MTTCG for 32 bit arm on x86
  https://github.com/stsquad/qemu/tree/mttcg/enable-mttcg-for-armv7-v1
- [RFC v8 00/14] Slow-path for atomic instruction translation
  https://git.virtualopensystems.com/dev/qemu-mt/tree/\
  slowpath-for-atomic-v8-no-mttcg - only minor changes have been necessary
- Few recent patches from Emilio regarding the spinlock implementation

Overall, these patches allow the LL/SC infrastructure to work in multi-threaded
mode (patches 01-02-04) and make TLB flushes to other VCPUs safe.

Patch 03 introduces a new API to submit a work item to a VCPU and wait for its
completion. This API is used to query TLB flushes that result from the
emulation of some ARM instructions. Patches 07, 08 and 09 modify the current
tlb_flush_* functions to use the new API.  Patch 10 fixes a rare hang that I
was experiencing with this branch.

The whole work can be fetched from the following repository:
git@git.virtualopensystems.com:dev/qemu-mt.git
at the branch "slowpath-for-atomic-v8-mttcg".

Alvise Rigo (10):
  exec: Introduce tcg_exclusive_{lock,unlock}()
  softmmu_llsc_template.h: Move to multi-threading
  cpus: Introduce async_wait_run_on_cpu()
  cputlb: Introduce tlb_flush_other()
  target-arm: End TB after ldrex instruction
  cputlb: Add tlb_tables_flush_bitmap()
  cputlb: Query tlb_flush_by_mmuidx
  cputlb: Query tlb_flush_page_by_mmuidx
  cputlb: Query tlb_flush_page_all
  cpus: Do not sleep if some work item is pending

 cpus.c                     |  48 ++++++++++-
 cputlb.c                   | 202 ++++++++++++++++++++++++++++++++++-----------
 exec.c                     |  18 ++++
 include/exec/exec-all.h    |  13 +--
 include/qom/cpu.h          |  36 ++++++++
 softmmu_llsc_template.h    |  13 ++-
 softmmu_template.h         |   6 ++
 target-arm/helper.c        |  79 +++++++++---------
 target-arm/op_helper.c     |   6 ++
 target-arm/translate-a64.c |   2 +
 target-arm/translate.c     |   2 +
 11 files changed, 327 insertions(+), 98 deletions(-)

-- 
2.8.3