On Tue, Nov 8, 2016 at 11:06 AM, Thomas Gleixner <[email protected]> wrote: > On Tue, 8 Nov 2016, 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 >> http://www.intel.com/content/dam/www/public/us/en/documents/application-notes/virtualization-technology-flexmigration-application-note.pdf
Done. https://bugzilla.kernel.org/attachment.cgi?id=243991 > Can you please stick that document into the kernel bugzilla, as it's going > to be on a different place before this gets merged into Linus tree? > > See: > http://lkml.kernel.org/r/[email protected] > >> + static const struct msr_bit msr_bits[] = { >> + { X86_FEATURE_CPUID_FAULT, MSR_PLATFORM_INFO, 31 }, > > Can you please make that PLATINFO_CPUID_FAULT_BIT instead of 31? Sure. - Kyle
