> > Ok, but I'm still missing why you think that is needed. What would be the > second page table walker that needs implementing? > > I guess we could implement that on arm64 using our current vmemmap_populate > logic and an explicit memset. >
Hi Will, What do you mean by explicit memset()? We can't simply memset() from start to end without doing the page table walk, because at the time kasan is calling vmemmap_populate() we have a tmp_pg_dir instead of swapper_pg_dir. We could do the explicit memset() after cpu_replace_ttbr1(lm_alias(swapper_pg_dir)); but again, this was in one of my previous implementations, and I was asked to replace that. Pavel
