On Wed, Nov 16, 2016 at 06:06:08PM -0800, Kyle Huey wrote: > Intel supports faulting on the CPUID instruction beginning with Ivy Bridge. > When enabled, the processor will fault on attempts to execute the CPUID > instruction with CPL>0. This will allow a ptracer to emulate the CPUID > instruction. > > Bit 31 of MSR_PLATFORM_INFO advertises support for this feature. It is > documented in detail in Section 2.3.2 of > https://bugzilla.kernel.org/attachment.cgi?id=243991 > > Detect support for this feature and expose it as X86_FEATURE_CPUID_FAULT. > > Signed-off-by: Kyle Huey <khuey@xxxxxxxxxxxx> > --- > arch/x86/include/asm/cpufeatures.h | 1 + > arch/x86/include/asm/msr-index.h | 2 ++ > arch/x86/kernel/cpu/intel.c | 12 ++++++++++++ > 3 files changed, 15 insertions(+) Reviewed-by: Borislav Petkov <bp@xxxxxxx> -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) -- -- To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
