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Section 2.4.4 of the Hypervisor Top Level Functional Specification states that enabling bit 10 in EDX of CPUID leaf 3 advertises to Windows a set of MSRs into which it can write crash information. This patch advertises that bit and implements the MSRs such that Xen can log the information if a Windows guest crashes. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Wei Liu <wei.liu2@citrix.com>