On Tue, Oct 17, 2017 at 03:40:56AM -0400, Pankaj Gupta wrote: > Are you saying do it as existing i.e ACPI pmem like interface? > The reason we have created this new driver is exiting pmem driver > does not define proper semantics for guest flushing requests. At this point I'm caring about the Linux-internal interface, and for that it should be integrated into the nvdimm subsystem and not a block driver. How the host <-> guest interface looks is a different idea. > > Regarding block support of driver, we want to achieve DAX support > to bypass guest page cache. Also, we want to utilize existing DAX > capable file-system interfaces(e.g fsync) from userspace file API's > to trigger the host side flush request. Well, if you want to support XFS+DAX better don't make it a block devices, because I'll post patches soon to stop using the block device entirely for the DAX case.
