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    SubjectRe: [PATCH v6 7/9] x86: Enable Syscall User Dispatch
    On Fri, Sep 04, 2020 at 04:31:45PM -0400, Gabriel Krisman Bertazi wrote:
    > Syscall User Dispatch requirements are fully supported in x86. This
    > patch flips the switch, marking it as supported. This was tested
    > against Syscall User Dispatch selftest.
    >
    > Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
    > ---
    > arch/x86/Kconfig | 1 +
    > 1 file changed, 1 insertion(+)
    >
    > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    > index 7101ac64bb20..56ac8de99021 100644
    > --- a/arch/x86/Kconfig
    > +++ b/arch/x86/Kconfig
    > @@ -150,6 +150,7 @@ config X86
    > select HAVE_ARCH_COMPAT_MMAP_BASES if MMU && COMPAT
    > select HAVE_ARCH_PREL32_RELOCATIONS
    > select HAVE_ARCH_SECCOMP_FILTER
    > + select HAVE_ARCH_SYSCALL_USER_DISPATCH

    Is this needed at all? I think simply "the architecture uses the generic
    entry code" is sufficient to enable it. (Especially since there's a top
    level config for SYSCALL_USER_DISPATCH, it feels like overkill).

    --
    Kees Cook

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