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Date: Thu, 15 Sep 2016 04:25:38 -0600
From: "Jan Beulich" <JBeulich@suse.com>
To: "David Vrabel" <david.vrabel@citrix.com>
Cc: "Aravind Gopalakrishnan" <aravind.gopalakrishnan@amd.com>,
        "Huang Rui" <ray.huang@amd.com>,
        "Peter Zijlstra" <peterz@infradead.org>,
        "Len Brown" <len.brown@intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        "Andy Lutomirski" <luto@kernel.org>,
        "maintainer:X86 ARCHITECTURE 32-BIT AND 64-BIT" <x86@kernel.org>,
        "Kyle Huey" <me@kylehuey.com>, "Thomas Gleixner" <tglx@linutronix.de>,
        "Alexander Shishkin" <alexander.shishkin@linux.intel.com>,
        "DaveHansen" <dave.hansen@linux.intel.com>,
        "Kristen Carlson Accardi" <kristen@linux.intel.com>,
        "Srinivas Pandruvada" <srinivas.pandruvada@linux.intel.com>,
        "moderated list:XEN HYPERVISOR INTERFACE" 
        <xen-devel@lists.xenproject.org>,
        "Vladimir Zapolskiy" <vladimir_zapolskiy@mentor.com>,
        "Robert O'Callahan" <robert@ocallahan.org>,
        "Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
        "Ingo Molnar" <mingo@redhat.com>, "Juergen Gross" <JGross@suse.com>,
        "Borislav Petkov" <bp@suse.de>,
        "open list:X86 ARCHITECTURE 32-BIT AND 64-BIT" 
        <linux-kernel@vger.kernel.org>,
        "H. PeterAnvin" <hpa@zytor.com>
Subject: Re: [Xen-devel] [PATCH v2 2/3] x86 Test and expose CPUID
 faulting capabilities in /proc/cpuinfo
References: <1473886902-17902-1-git-send-email-khuey@kylehuey.com>
 <1473886902-17902-3-git-send-email-khuey@kylehuey.com>
 <57DA724E.6090606@citrix.com>
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>>> On 15.09.16 at 12:05, <david.vrabel@citrix.com> wrote:
> On 14/09/16 22:01, Kyle Huey wrote:
>> Xen advertises the underlying support for CPUID faulting but not does pass
>> through writes to the relevant MSR, nor does it virtualize it, so it does
>> not actually work. For now mask off the relevant bit on MSR_PLATFORM_INFO.
> 
> Could you clarify in the commit message that it is PV guests that are
> affected.

What makes you think HVM ones aren't?

Jan