linux-kernel - Re: [PATCH v4 15/30] riscv/mm: Implement map_shadow

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Message-ID: <8904b159-7798-454e-a615-34566c088fda@sirena.org.uk>
Date: Fri, 13 Sep 2024 16:26:20 +0100
From: Mark Brown <broonie@...nel.org>
To: Deepak Gupta <debug@...osinc.com>
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Subject: Re: [PATCH v4 15/30] riscv/mm: Implement map_shadow_stack() syscall

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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