• Thomas Gleixner's avatar
    x86/speculation: Add command line control for indirect branch speculation · fa1202ef
    Thomas Gleixner authored
    Add command line control for user space indirect branch speculation
    mitigations. The new option is: spectre_v2_user=
    
    The initial options are:
    
        -  on:   Unconditionally enabled
        - off:   Unconditionally disabled
        -auto:   Kernel selects mitigation (default off for now)
    
    When the spectre_v2= command line argument is either 'on' or 'off' this
    implies that the application to application control follows that state even
    if a contradicting spectre_v2_user= argument is supplied.
    Originally-by: default avatarTim Chen <tim.c.chen@linux.intel.com>
    Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Reviewed-by: default avatarIngo Molnar <mingo@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Jiri Kosina <jkosina@suse.cz>
    Cc: Tom Lendacky <thomas.lendacky@amd.com>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Andrea Arcangeli <aarcange@redhat.com>
    Cc: David Woodhouse <dwmw@amazon.co.uk>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Casey Schaufler <casey.schaufler@intel.com>
    Cc: Asit Mallick <asit.k.mallick@intel.com>
    Cc: Arjan van de Ven <arjan@linux.intel.com>
    Cc: Jon Masters <jcm@redhat.com>
    Cc: Waiman Long <longman9394@gmail.com>
    Cc: Greg KH <gregkh@linuxfoundation.org>
    Cc: Dave Stewart <david.c.stewart@intel.com>
    Cc: Kees Cook <keescook@chromium.org>
    Cc: stable@vger.kernel.org
    Link: https://lkml.kernel.org/r/20181125185005.082720373@linutronix.de
    fa1202ef
bugs.c 28.3 KB