• Ingo Molnar's avatar
    x86/fpu, crypto: Fix AVX2 feature tests · b54b4bbb
    Ingo Molnar authored
    For some CPU models I broke the AVX2 feature detection in:
    
      7bc371fa ("x86/fpu, crypto x86/camellia_aesni_avx2: Simplify the camellia_aesni_init() xfeature checks")
      534ff06e ("x86/fpu, crypto x86/serpent_avx2: Simplify the init() xfeature checks")
    
    ... because I did not realize that it's possible for a CPU to support
    the xstate necessary for AVX2 execution (XSTATE_YMM), but not have
    the AVX2 instructions themselves.
    
    Restore the necessary CPUID checks as well.
    
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: Fenghua Yu <fenghua.yu@intel.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Oleg Nesterov <oleg@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
    b54b4bbb
serpent_avx2_glue.c 15.7 KB