Introduce two new variables to synchronize the vCPUs during atomic operations.
- exit_flush_request allows one vCPU to make an exclusive flush request for all the running vCPUs - tcg_excl_access_lock is a mutex that protects all the sensible operations concerning atomic instruction emulation. Most of all, the mutex is used to protect the env->exclusive_protected_hwaddr (one mutex for all vCPUs). Suggested-by: Jani Kokkonen <jani.kokko...@huawei.com> Suggested-by: Claudio Fontana <claudio.font...@huawei.com> Signed-off-by: Alvise Rigo <a.r...@virtualopensystems.com> --- cputlb.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/cputlb.c b/cputlb.c index 9794e6b..66df41a 100644 --- a/cputlb.c +++ b/cputlb.c @@ -39,6 +39,10 @@ void qemu_mutex_unlock_iothread(void); /* statistics */ int tlb_flush_count; +/* For atomic instruction handling. */ +volatile int exit_flush_request = 0; +QemuMutex tcg_excl_access_lock; + /* NOTE: * If flush_global is true (the usual case), flush all tlb entries. * If flush_global is false, flush (at least) all tlb entries not -- 2.4.5
