[PATCH v4 15/30] riscv/mm: Implement map_shadow_stack() syscall

[Mark Brown]

On Thu, Sep 12, 2024 at 04:16:34PM -0700, Deepak Gupta wrote:

> This patch implements this syscall for riscv. riscv doesn't require token
> to be setup by kernel because user mode can do that by itself. However to
> provide compatibility and portability with other architectues, user mode
> can specify token set flag.

The arm64 series also adds SHADOW_STACK_SET_MARKER for a top of stack
marker, if this is only being done for compatibility it might be good to
pick that up as well.  I don't know what the thoughts are on using them
for RISC-V.  On arm64 the top of stack marker is just all bits 0.
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