On 24/11/2017 14:02, Pankaj Gupta wrote: > >>> - Suggestion by Paolo & Stefan(previously) to use virtio-blk makes sense >>> if just >>> want a flush vehicle to send guest commands to host and get reply >>> after asynchronous >>> execution. There was previous discussion [1] with Rik & Dan on this. >>> >>> [1] https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg08373.html >> >> ... in fact, the virtio-blk device _could_ actually accept regular I/O >> too. That would make it easier to boot from pmem. Is there anything >> similar in regular hardware? > > there is existing block device associated(hard bind) with the pmem range. > Also, comment by Christoph [1], about removing block device with DAX support. > Still I am not clear about this. Am I missing anything here? The I/O part of the blk device would only be used by the firmware. In Linux, the different device id would bind the device to a different driver that would only be used for flushing. But maybe this idea makes no sense. :) Paolo
