linux-kernel - Re: [Xen-devel] [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo

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Date:   Thu, 15 Sep 2016 04:25:38 -0600
From:   "Jan Beulich" <JBeulich@...e.com>
To:     "David Vrabel" <david.vrabel@...rix.com>
Cc:     "Aravind Gopalakrishnan" <aravind.gopalakrishnan@....com>,
        "Huang Rui" <ray.huang@....com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Len Brown" <len.brown@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        "Andy Lutomirski" <luto@...nel.org>,
        "maintainer:X86 ARCHITECTURE 32-BIT AND 64-BIT" <x86@...nel.org>,
        "Kyle Huey" <me@...ehuey.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Alexander Shishkin" <alexander.shishkin@...ux.intel.com>,
        "DaveHansen" <dave.hansen@...ux.intel.com>,
        "Kristen Carlson Accardi" <kristen@...ux.intel.com>,
        "Srinivas Pandruvada" <srinivas.pandruvada@...ux.intel.com>,
        "moderated list:XEN HYPERVISOR INTERFACE" 
        <xen-devel@...ts.xenproject.org>,
        "Vladimir Zapolskiy" <vladimir_zapolskiy@...tor.com>,
        "Robert O'Callahan" <robert@...llahan.org>,
        "Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
        "Ingo Molnar" <mingo@...hat.com>,
        "Juergen Gross" <JGross@...e.com>, "Borislav Petkov" <bp@...e.de>,
        "open list:X86 ARCHITECTURE 32-BIT AND 64-BIT" 
        <linux-kernel@...r.kernel.org>, "H. PeterAnvin" <hpa@...or.com>
Subject: Re: [Xen-devel] [PATCH v2 2/3] x86 Test and expose CPUID
 faulting capabilities in /proc/cpuinfo

>>> On 15.09.16 at 12:05, <david.vrabel@...rix.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