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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.07.12 at 15:37, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Wed, 2012-07-04 at 14:08 +0100, Liu, Jinsong wrote:
>> Xen/MCE: adjust for future new vMCE model
>> 
>> Recently we designed a new vMCE model, and would implement later.
>> 
>> In order not to block live migration from current vMCE to future new vMCE,
>> we do some middle work in this patch, basically it does minimal adjustment, 
> including
>> 1. remove MCG_CTL;
>> 2. stick all 1's to MCi_CTL;
>> 3. set MCG_CTL_P=0 and 2 banks at MCG_CAP;
> 
> Does this have any impact on the ability to migrate from 4.1 -> 4.2?

That migration is broken anyway (as much as 4.1 -> 4.1 is when
the hosts have different MCE capabilities). For a 4.1 -> 4.2
migration between equal hosts, I don't think there's any problem
(as 4.1 doesn't save any MCE related data).

Jan


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