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[Xen-devel] vMCE vs migration

x86's vMCE implementation lets a guest know of as many MCE reporting
banks as there are in the host. While a PV guest could be expected to
deal with this number changing (particularly decreasing) during migration
(not currently handled anywhere afaict), for HVM guests this is certainly

At least to me it isn't, however, clear how to properly handle this. The
easiest would appear to be to save and restore the number of banks
the guest was made believe it can access, making vmce_{rd,wr}msr()
silently tolerate accesses between the host and guest values.

Any thoughts appreciated,

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