RE: [Xen-devel] address space reorganization

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> > One would hope, but just because a customer has lots of 
> money to spend 
> > on hardware doesn't mean that he is rowing with both oars. 
> This is a 
> > supportability issue. The xen{source} folks would do themselves a 
> > favor by trapping a guest's use of unsupported instructions and 
> > logging it. That would make it easy enough to track down if a 
> > customer's apps stop working when using migration.
> 
> Good idea, trapping unsupported instructions and printing out 
> the category the instruction belongs to (eg. SSE2) will make 
> things a lot easier to track.  I like this idea a lot...

Yep, although we can't trap the cpuid, we can trap the use of e.g. SSE2.

We have to be a bit careful though, to prevent DoS of the Xen console.
We'd need to rate limit such messages. Patches welcome :-)

Ian

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