Subject: Re: [PATCH 1/4] x86/cpufeature: Add User-Mode Instruction Prevention
 definitions
To: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>,
        Borislav Petkov <bp@suse.de>
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Cc: Andy Lutomirski <luto@amacapital.net>, Ingo Molnar <mingo@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        X86 ML <x86@kernel.org>,
        "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
        Andy Lutomirski <luto@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Brian Gerst <brgerst@gmail.com>, Chen Yucong <slaoub@gmail.com>,
        Chris Metcalf <cmetcalf@mellanox.com>,
        Fenghua Yu <fenghua.yu@intel.com>, Huang Rui <ray.huang@amd.com>,
        Jiri Slaby <jslaby@suse.cz>, Jonathan Corbet <corbet@lwn.net>,
        "Michael S . Tsirkin" <mst@redhat.com>,
        Paul Gortmaker <paul.gortmaker@windriver.com>,
        Peter Zijlstra <peterz@infradead.org>,
        "Ravi V . Shankar" <ravi.v.shankar@intel.com>,
        Shuah Khan <shuah@kernel.org>, Vlastimil Babka <vbabka@suse.cz>
From: Dave Hansen <dave.hansen@linux.intel.com>
Message-ID: <54980dba-9786-39ac-97da-23a679c96d9c@linux.intel.com>
Date: Fri, 11 Nov 2016 10:06:44 -0800
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On 11/10/2016 08:08 PM, Ricardo Neri wrote:
> Thanks for the suggestions. Perhaps I can include these metrics in my
> V2. On th other hand, Dave Hansen gave a good argument on potential
> conflicts when, of instance running on an AMD CPU. UMIP is enabled by
> setting a bit in CR4. If that bit is not supposed to be set, that could
> cause a #GP fault.

I just meant that some folks probably appreciate being able to build out
all the Intel-specific features.  Not that it causes a functional problem.