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Re: [Xen-devel] [PATCH v2 2/3] x86 Test and expose CPUID faulting capabilities in /proc/cpuinfo
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Kyle Huey <me@xxxxxxxxxxxx>
- Date: Thu, 15 Sep 2016 12:11:53 -0700
- Cc: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, DaveHansen <dave.hansen@xxxxxxxxxxxxxxx>, Huang Rui <ray.huang@xxxxxxx>, Kristen Carlson Accardi <kristen@xxxxxxxxxxxxxxx>, "H. PeterAnvin" <hpa@xxxxxxxxx>, Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "maintainer:X86 ARCHITECTURE 32-BIT AND 64-BIT" <x86@xxxxxxxxxx>, Robert O'Callahan <robert@xxxxxxxxxxxxx>, Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "moderated list:XEN HYPERVISOR INTERFACE" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxx>, Len Brown <len.brown@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Juergen Gross <JGross@xxxxxxxx>, "open list:X86 ARCHITECTURE 32-BIT AND 64-BIT" <linux-kernel@xxxxxxxxxxxxxxx>, Aravind Gopalakrishnan <aravind.gopalakrishnan@xxxxxxx>, David Vrabel <david.vrabel@xxxxxxxxxx>, Vladimir Zapolskiy <vladimir_zapolskiy@xxxxxxxxxx>
- Delivery-date: Thu, 15 Sep 2016 19:12:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Thu, Sep 15, 2016 at 3:25 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>> On 15.09.16 at 12:05, <david.vrabel@xxxxxxxxxx> 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?
Testing on EC2, HVM guests are affected as well. Not sure what to do
about that.
- Kyle
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