From: KONRAD Frederic <fred.kon...@greensocs.com> This is the async_safe_work introduction bit of the Multithread TCG work. Rebased on current upstream (6169b60285fe1ff730d840a49527e721bfb30899).
(Currently untested as I need to rebase MTTCG first.) It can be cloned here: http://git.greensocs.com/fkonrad/mttcg.git branch async_work_v3 The first patch introduces a mutex to protect the existing queued_work_* CPUState members against multiple (concurent) access. The second patch introduces a tcg_exec_flag which will be 1 when we are inside cpu_exec(), -1 when we must not enter the cpu execution and 0 when we are allowed to do so. This is required as safe work need to be sure that's all vCPU are outside cpu_exec(). The last patch introduces async_safe_work. It allows to add some work which will be done asynchronously but only when all vCPUs are outside cpu_exec(). The tcg thread will wait that no vCPUs have any pending safe work before reentering cpu-exec(). Changes V2 -> V3: * Check atomically we are not in the executiong loop to fix the race condition which might happen. Changes V1 -> V2: * Release the lock while running the callback for both async and safe work. KONRAD Frederic (3): cpus: protect queued_work_* with work_mutex. cpus: add tcg_exec_flag. cpus: introduce async_run_safe_work_on_cpu. cpu-exec.c | 10 ++++ cpus.c | 160 ++++++++++++++++++++++++++++++++++++++++-------------- include/qom/cpu.h | 57 +++++++++++++++++++ qom/cpu.c | 20 +++++++ 4 files changed, 207 insertions(+), 40 deletions(-) -- 1.9.0
