On Fri, Jan 25, 2019 at 12:20 AM Du, Fan <fan.du@xxxxxxxxx> wrote: > > Dan > > Thanks for the insights! > > Can I say, the UCE is delivered from h/w to OS in a single way in case of machine > check, only PMEM/DAX stuff filter out UC address and managed in its own way by > badblocks, if PMEM/DAX doesn't do so, then common RAS workflow will kick in, > right? The common RAS workflow always kicks in, it's just the page state presented by a DAX mapping needs distinct handling. Once it is hot-plugged it no longer needs to be treated differently than "System RAM". > And how about when ARS is involved but no machine check fired for the function > of this patchset? The hotplug effectively disconnects this address range from the ARS results. They will still be reported in the libnvdimm "region" level badblocks instance, but there's no safe / coordinated way to go clear those errors without additional kernel enabling. There is no "clear error" semantic for "System RAM".
