Em Thu, 9 Jan 2025 18:34:48 +0000 Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> escreveu: > On Thu, 9 Jan 2025 17:19:02 +0100 > Borislav Petkov <bp@xxxxxxxxx> wrote: > > > > But then why do you even need the interface at all? > > > > Why can't the kernel automatically collect all those attributes and start the > > scrubbing automatically - no need for any user interaction...? Implementing policies at Kernelspace is a very bad idea. See, to properly implement scrubbing and memory sparing policies, one needs to have knowledge not only about the current Kernel lifetime (which may be a recent boot due to a Kernel upgrade), but also for events that happened in the past months/years. On other words, a database is needed to know if a memory error was just a random issue due to high cosmic ray activities (so, a soft PPR would be used - just in case), or if it is due to some memory region that it is known to have past problems, probably an indication of a a hardware issue - in which case a hard PPR would be used instead. If this were meant to be done automatically, CXL wouldn't need to send events about that to the OSPM. Also, different usecases may require different policies. So, better to let an userspace daemon to handle policies, and use sysfs for such daemon to to setup the hardware. Thanks, Mauro
