Re: [Qemu-devel] KVM "fake DAX" flushing interface - discussion
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