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

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,