Re: [PATCH v2 2/6] userfaultfd: add /dev/userfaultfd for fine grained access control

[Peter Xu]

Axel,

On Fri, Apr 22, 2022 at 02:29:41PM -0700, Axel Rasmussen wrote:
> @@ -65,6 +66,8 @@ struct userfaultfd_ctx {
>  	unsigned int flags;
>  	/* features requested from the userspace */
>  	unsigned int features;
> +	/* whether or not to handle kernel faults */
> +	bool handle_kernel_faults;

Could you help explain why we need this bool?  I failed to figure out
myself on the difference against "!(ctx->flags & UFFD_USER_MODE_ONLY)".

Thanks,

-- 
Peter Xu