• Dave Hansen's avatar
    x86/fpu: Check CPU-provided sizes against struct declarations · ef78f2a4
    Dave Hansen authored
    We now have C structures defined for each of the XSAVE state
    components that we support.  This patch adds checks during our
    verification pass to ensure that the CPU-provided data
    enumerated in CPUID leaves matches our C structures.
    
    If not, we warn and dump all the XSAVE CPUID leaves.
    
    Note: this *actually* found an inconsistency with the MPX
    'bndcsr' state.  The hardware pads it out differently from
    our C structures.  This patch caught it and warned.
    Signed-off-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Fenghua Yu <fenghua.yu@intel.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Tim Chen <tim.c.chen@linux.intel.com>
    Cc: dave@sr71.net
    Cc: linux-kernel@vger.kernel.org
    Link: http://lkml.kernel.org/r/20150902233131.A8DB36DA@viggo.jf.intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    ef78f2a4
xstate.c 20.1 KB