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Pass PCOMMIT CPU feature into HVM domain. Currently, we do not intercept pcommit instruction for L1 guest, and allow L1 to intercept pcommit instruction for L2 guest. The specification of pcommit instruction can be found in https://software.intel.com/sites/default/files/managed/0d/53/319433-022.pdf Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Kevin Tian <kevin.tian@intel.com> Acked-by: Wei Liu <wei.liu2@citrix.com> for tools bits