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    SubjectRe: [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,

    --
    Peter Xu

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