Hi, I am trying to understand the code of QEMU and one of the things which is unclear to me is what are the purposes of the loops: main_loop_wait() and os_host_main_loop_wait(). They both look similar since they prepare fds, poll them and dispatch them but I assume they process different fds (otherwise, why there would be two different loops?).
>From the name, I tend to think that main_loop_wait() polls fds which represent emulated devices consumed by the guest OS, whereas os_host_main_loop() polls fds from the host OS which are consumed by QEMU. Assuming my interpretation is correct, if the guestOS writes a block on /dev/vda, the write call will be processed by main_loop_wait() (it will send the block to the specific disk device in the host) and the ack from the disk will be first processed by os_host_main_loop_wait() (it will send the ack to the Guest OS). Is my interpretation correct? Thanks in advance!
