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Re: [Xen-devel] [PATCH v4 02/15] x86/cpu: Fix common cpuid faulting probing for AMD and Hygon
- To: Pu Wen <puwen@xxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 2 Apr 2019 18:04:52 +0100
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 02 Apr 2019 17:14:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 02/04/2019 17:14, Pu Wen wrote:
> On 2019/4/2 23:46, Jan Beulich wrote:
>> On 02.04.19 at 13:58, <puwen@xxxxxxxx> wrote:
>>> On 2019/4/2 18:20, Jan Beulich wrote:
>>>> On 02.04.19 at 08:46, <puwen@xxxxxxxx> wrote:
>>>>> On 2019/4/1 16:41, Jan Beulich wrote:
>>>>>> On 30.03.19 at 11:42, <puwen@xxxxxxxx> wrote:
>>>>>>> There is no MSR_INTEL_PLATFORM_INFO for AMD and Hygon families.
>>>>>>> So directly
>>>>>>> return false in the function probe_cpuid_faulting() if
>>>>>>> !cpu_has_hypervisor.
>>>>>>
>>>>>> I think it would have been nice if you had mentioned the real
>>>>>> reason why you want to bypass the MSR accesses. This way it
>>>>>> sounds as if the change was only cosmetic, and hence could be
>>>>>> left out.
>>>>>
>>>>> Okay, how about the new description:
>>>>> There is no MSR_INTEL_PLATFORM_INFO for AMD and Hygon families. Read
>>>>> this MSR will stop the Xen initialization process
>>>>
>>>> "... for some early Hygon steppings"(?). I'm unaware of AMD CPUs
>>>
>>> Yes,for some early Hygon steppings.
>>>
>>>> having this issue - are you telling us otherwise?
>>>
>>> I tested with an AMD CPU(Family 17h, Model 1, Stepping 1) today, and
>>> it also stopped when reading the MSR_INTEL_PLATFORM_INFO instead of
>>> producing #GP(0).
>>
>> I've yet to try it out on my Rome system, but I have to admit I
>
> We have Rome system too, I'll have a try on it as well.
I've just spoken to a contact at AMD, and they've never encountered an
issue like this.
If it behaviour does manifest, then it is very concerning.
~Andrew
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