Messages in this thread | | | From | Kyle Huey <> | Date | Tue, 8 Nov 2016 11:38:25 -0800 | Subject | Re: [PATCH v10 5/7] x86/cpufeature: Detect CPUID faulting support |
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On Tue, Nov 8, 2016 at 11:06 AM, Thomas Gleixner <tglx@linutronix.de> 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/1478631281-5061-1-git-send-email-kan.liang@intel.com > >> + 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
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