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

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

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)?

Thanks,
Jinsong
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel