riscv: Rework kasan population functions
Our previous kasan population implementation used to have the final kasan shadow region mapped with kasan_early_shadow_page, because we did not clean the early mapping and then we had to populate the kasan region "in-place" which made the code cumbersome. So now we clear the early mapping, establish a temporary mapping while we populate the kasan shadow region with just the kernel regions that will be used. This new version uses the "generic" way of going through a page table that may be folded at runtime (avoid the XXX_next macros). It was tested with outline instrumentation on an Ubuntu kernel configuration successfully. Signed-off-by:Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by:
Björn Töpel <bjorn@rivosinc.com> Link: https://lore.kernel.org/r/20230203075232.274282-3-alexghiti@rivosinc.comSigned-off-by:
Palmer Dabbelt <palmer@rivosinc.com>
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