• Josh Poimboeuf's avatar
    x86/paravirt: Remove 'noreplace-paravirt' cmdline option · 12c69f1e
    Josh Poimboeuf authored
    
    
    The 'noreplace-paravirt' option disables paravirt patching, leaving the
    original pv indirect calls in place.
    
    That's highly incompatible with retpolines, unless we want to uglify
    paravirt even further and convert the paravirt calls to retpolines.
    
    As far as I can tell, the option doesn't seem to be useful for much
    other than introducing surprising corner cases and making the kernel
    vulnerable to Spectre v2.  It was probably a debug option from the early
    paravirt days.  So just remove it.
    Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
    Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Reviewed-by: default avatarJuergen Gross <jgross@suse.com>
    Cc: Andrea Arcangeli <aarcange@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Ashok Raj <ashok.raj@intel.com>
    Cc: Greg KH <gregkh@linuxfoundation.org>
    Cc: Jun Nakajima <jun.nakajima@intel.com>
    Cc: Tim Chen <tim.c.chen@linux.intel.com>
    Cc: Rusty Russell <rusty@rustcorp.com.au>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Asit Mallick <asit.k.mallick@intel.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Jason Baron <jbaron@akamai.com>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Alok Kataria <akataria@vmware.com>
    Cc: Arjan Van De Ven <arjan.van.de.ven@intel.com>
    Cc: David Woodhouse <dwmw2@infradead.org>
    Cc: Dan Williams <dan.j.williams@intel.com>
    Link: https://lkml.kernel.org/r/20180131041333.2x6blhxirc2kclrq@treble
    12c69f1e