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CP-308875: set Xen PCI MMIO BAR to WB (#6591) The default for the Xen PCI MMIO BAR is UnCachable. Setting this to WriteBack in the MTRR shows a massive performance improvement on AMD, at least for Linux guests. On Intel this is already set to WriteBack by Xen via another mechanism. To be effective this also requires the corresponding [Xen commit](https://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=22650d605), old versions will just ignore this xenstore key. The optimization is not enabled by default in Xen due to the wide range of guests it supports, but XAPI supports a much narrower set of guest OSes. Setting the cache attribute to WB is done by setting UC=0.
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