Re: [Xen-devel] [PATCH] Xen/MCE: adjust for future new vMCE model

["Liu, Jinsong" <jinsong.liu@xxxxxxxxx>]

Christoph Egger wrote:
> On 07/05/12 11:36, Liu, Jinsong wrote:
> 
>> Christoph Egger wrote:
>>> On 07/05/12 09:00, Jan Beulich wrote:
>>> 
>>>>>>> On 04.07.12 at 18:08, "Liu, Jinsong" <jinsong.liu@xxxxxxxxx>
>>>>>>> wrote: Christoph Egger wrote: On 07/04/12 15:08, Liu, Jinsong
>>>>>>> wrote: +    g_mcg_cap = MCG_TES_P | MCG_SER_P | GUEST_BANK_NUM;
>>>>>>> + 
>>>>>> 
>>>>>> 
>>>>>> Is MCG_TES_P and MCG_SER_P emulated independent if the host has
>>>>>> them or not? For AMD this only works if the answer is yes.
>>>>>> 
>>>>>> (I know in upstream this code path is used by Intel only but I
>>>>>> have patches that brings this code path in use by both AMD and
>>>>>> Intel.) 
>>>>>> 
>>>>>> Christoph
>>>>> 
>>>>> I'm not sure if AMD has these 2 bits in MCG_CAP. Could you tell me
>>>>> where can I get AMD's *latest* open doc (something like amd
>>>>> architecture programmer manual)?
>>>>> 
>>>>> If AMD has these 2 bits, it's safe to set them independent of host
>>>>> capability -- guest will just think it running on a platform w/
>>>>> some events *possilbe* (though actually may never occur),
>>>>> hypervisor know what actually occur and has the flexibility to
>>>>> decide what it would like to inject to guest.
>>>> 
>>>> According to the latest doc I have access to, neither of these two
>>>> bits are known there (nor are any other of the bits beyond 8). But
>>>> as we don't want to surface model specific behavior to guests,
>>>> having these bits set seems the right thing in any case. The
>>>> MCi_STATUS values reported to guests just may need some
>>>> additional massaging.
>>>> 
>>>> All this is of course assuming that AMD won't assign these bits
>>>> _different_ meanings in the future, but as that would be pretty
>>>> counter productive (requiring more vendor specific code in all
>>>> OSes) that seems pretty unlikely. Christoph?
>>> 
>>> Let me ask back internally.
>>> 
>>> Christoph
>> 
>> Christoph, where can I get more AMD mce details (of course open doc)?
> 
>> I read 'amd64 architecture programmer manual (v2).pdf' (publication
>> number 24593, Rev 3.18, May 2011), but seems it's quite general. Per
>> that document I cannot answer some of your questions. Are there more
>> deatials in K7/K8/K10 docs (but I fail to find these docs)?
> 
> 
> 
> 
> 
> Public documentation is available at
> http://developer.amd.com/documentation/guides/Pages/default.aspx
> 
> The latest APM v2 you are asking is
> http://support.amd.com/us/Processor_TechDocs/24593_APM_v2.pdf
> 
> CPU family specific information are in the BKDG
> (BIOS and Kernel Developer Guide).
> 
> K8 documentation is no longer available. The only difference to
> Family10h is that Family10h has three exra MC4 MISC  MSRs.
> 
> Christoph

Thanks a lot! Jinsong

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