From: Suresh Siddha Date: Tue, 31 Jul 2012 17:29:14 +0000 (-0700) Subject: x86, avx: don't use avx instructions with "noxsave" boot param X-Git-Tag: v3.5.5~90 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4a74b60aa6551430ed6e700568199f50eca67028;p=thirdparty%2Fkernel%2Fstable.git x86, avx: don't use avx instructions with "noxsave" boot param commit c6fd893da927c6cefb2ece22402765379921a834 upstream. Clear AVX, AVX2 features along with clearing XSAVE feature bits, as part of the parsing "noxsave" parameter. Fixes the kernel boot panic with "noxsave" boot parameter. We could have checked cpu_has_osxsave along with cpu_has_avx etc, but Peter mentioned clearing the feature bits will be better for uses like static_cpu_has() etc. Signed-off-by: Suresh Siddha Link: http://lkml.kernel.org/r/1343755754.2041.2.camel@sbsiddha-desk.sc.intel.com Signed-off-by: H. Peter Anvin Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 6b9333b429ba1..cc9c146c58455 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -144,6 +144,8 @@ static int __init x86_xsave_setup(char *s) { setup_clear_cpu_cap(X86_FEATURE_XSAVE); setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT); + setup_clear_cpu_cap(X86_FEATURE_AVX); + setup_clear_cpu_cap(X86_FEATURE_AVX2); return 1; } __setup("noxsave", x86_xsave_setup);