In RISC-V, tlb flush happens at a page granularity. That's why OpenSBI also have a tlb range flush limit which decides the which tlb flush requests should be upgraded to full flush to avoid long delays. Currently, this is set to 1G which would result in a many sfence.vma execution in a tight loop for a large range. Change the threshold to 4k to speed things up. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>