On Wed, May 19, 2021 at 1:20 PM Christoph Hellwig <hch@xxxxxx> wrote: > > On Wed, May 19, 2021 at 05:04:13AM +0000, guoren@xxxxxxxxxx wrote: > > From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx> > > > > The RISC-V ISA doesn't yet specify how to query or modify PMAs, so let > > vendors define the custom properties of memory regions in PTE. > > Err, hell no. The ISA needs to gets this fixed first. Then we can > talk about alternatives patching things in or trapping in the SBI. > But if the RISC-V ISA can't get these basic done after years we can't > support it in Linux at all. This is the lightest solution I could imagine, it avoids conflicts with RISC-V ISA. Since the existing RISC-V ISA cannot solve this problem, it is better to provide some configuration for the SOC vendor to customize. -- Best Regards Guo Ren ML: https://lore.kernel.org/linux-csky/
