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Re: [Xen-devel] [PATCH v4 02/15] x86/cpu: Fix common cpuid faulting probing for AMD and Hygon


  • To: Jan Beulich <JBeulich@xxxxxxxx>, Pu Wen <puwen@xxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Tue, 2 Apr 2019 16:49:52 +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 16:13:54 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 02/04/2019 16:46, 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
> find this hard to believe. Andrew - you've tried to boot Xen on a
> Rome already. Iirc you said it crashed, but did it perhaps get to
> (and past) this point?

I've got Fam10, 15, 17 (both Naples and Rome) and haven't encountered
any problems.

Whatever is going on, it sounds like a microcode bug.

~Andrew

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