On Tue, Sep 11, 2012 at 4:35 PM, Avi Kivity <a...@redhat.com> wrote: > On 09/11/2012 10:51 AM, Liu Ping Fan wrote: >> From: Liu Ping Fan <pingf...@linux.vnet.ibm.com> >> >> The func call chain can suffer from recursively hold >> qemu_mutex_lock_iothread. We introduce lockmap to record the >> lock depth. > > What is the root cause? io handlers initiating I/O? > cpu_physical_memory_rw() can be called nested, and when called, it can be protected by no-lock/device lock/ big-lock. I think without big lock, io-dispatcher should face the same issue. As to main-loop, have not carefully consider, but at least, dma-helper will call cpu_physical_memory_rw() with big-lock.
Regards, pingfan > Perhaps we can have a solution that is local to exec.c. > > > -- > error compiling committee.c: too many arguments to function
