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

On Thu, 2012-07-05 at 07:39 +0100, Jan Beulich wrote:
> >>> On 05.07.12 at 05:03, "Liu, Jinsong" <jinsong.liu@xxxxxxxxx> wrote:
> > Jan Beulich wrote:
> >> Also I seem to recall that there was going to be a need to
> >> save/restore MCi_CTL2, but there's nothing being done in that
> >> direction.
> > 
> > Yes, but that would be done at new vMCE.
> > Current vMCE didn't enable MCG_CMCI_P, and MCi_CTL2 are not used, so we 
> > don't save/restore MCi_CTL2 at this version.
> But _that_ is the major save/restore related issue to be
> addressed, at least if backward migration (4.2 -> 4.1) is also
> to be working reasonably. If such compatibility is entirely
> unneeded, then I agree that it likely doesn't need any
> consideration at this point.

We don't generally worry about N->N-1 migration, just N->N+1.


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