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Date: Fri, 11 Nov 2016 17:24:05 -0800 From: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com> To: Borislav Petkov <bp@...e.de> Cc: Andy Lutomirski <luto@...capital.net>, Ingo Molnar <mingo@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>, "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>, Andy Lutomirski <luto@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Brian Gerst <brgerst@...il.com>, Chen Yucong <slaoub@...il.com>, Chris Metcalf <cmetcalf@...lanox.com>, Dave Hansen <dave.hansen@...ux.intel.com>, Fenghua Yu <fenghua.yu@...el.com>, Huang Rui <ray.huang@....com>, Jiri Slaby <jslaby@...e.cz>, Jonathan Corbet <corbet@....net>, "Michael S . Tsirkin" <mst@...hat.com>, Paul Gortmaker <paul.gortmaker@...driver.com>, Peter Zijlstra <peterz@...radead.org>, "Ravi V . Shankar" <ravi.v.shankar@...el.com>, Shuah Khan <shuah@...nel.org>, Vlastimil Babka <vbabka@...e.cz> Subject: Re: [PATCH 1/4] x86/cpufeature: Add User-Mode Instruction Prevention definitions On Fri, 2016-11-11 at 11:22 +0100, Borislav Petkov wrote: > On Thu, Nov 10, 2016 at 08:08:07PM -0800, Ricardo Neri wrote: > > UMIP is enabled by setting a bit in CR4. If that bit is not supposed > > to be set, that could cause a #GP fault. > > Yeah, you do check CPUID first, AFAICT, so you should be ok... Right. I missed this detail. Yes, there should not be a problem. > > -- > Regards/Gruss, > Boris. > > SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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