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If LMCE is supported by host and ' mca_caps = [ "lmce" ] ' is present in xl config, the LMCE capability will be exposed in guest MSR_IA32_MCG_CAP. By default, LMCE is not exposed to guest so as to keep the backwards migration compatibility. Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> for hypervisor side Acked-by: Wei Liu <wei.liu2@citrix.com>