On Thu, Jan 18, 2024 at 12:28 PM Charan Teja Kalla <quic_charante@xxxxxxxxxxx> wrote: > > May I ask if KMSAN also instruments the access to the memory managed as > ZONE_DEVICE. You know this is not the RAM and also these pages will > never be onlined thus also not be available in buddy. Is there a way to tell whether a memory chunk belongs to ZONE_DEVICE by its address? Won't such check involve calling pfn_valid() or a similar function that would also require synchronization? In general, if e.g. one can call memset() on ZONE_DEVICE memory, it is already going to be instrumented by KMSAN.
