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This patch provides vMCE save/restore when migration. 1. MCG_CAP is well-defined. However, considering future cap extension, we keep save/restore logic that Jan implement at c/s 24887; 2. MCi_CTL2 initialized by guestos when booting, so need save/restore otherwise guest would surprise; 3. Other MSRs do not need save/restore since they are either error- related and pointless to save/restore, or, unified among all vMCE platform; Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com> - fix handling of partial data in XEN_DOMCTL_set_ext_vcpucontext - fix adjustment of xen_domctl_ext_vcpucontext Signed-off-by: Jan Beulich <jbeulich@suse.com> Committed-by: Jan Beulich <jbeulich@suse.com>