• Tim Chen's avatar
    x86/speculation: Reorganize speculation control MSRs update · bc4aa78e
    Tim Chen authored
    commit 01daf568 upstream
    
    The logic to detect whether there's a change in the previous and next
    task's flag relevant to update speculation control MSRs is spread out
    across multiple functions.
    
    Consolidate all checks needed for updating speculation control MSRs into
    the new __speculation_ctrl_update() helper function.
    
    This makes it easy to pick the right speculation control MSR and the bits
    in MSR_IA32_SPEC_CTRL that need updating based on TIF flags changes.
    Originally-by: default avatarThomas Lendacky <Thomas.Lendacky@amd.com>
    Signed-off-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/20181125185004.151077005@linutronix.deSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    bc4aa78e
process.c 19.3 KB