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The Feb 2022 microcode from Intel retrofits AMD's MSR_SPEC_CTRL.PSFD interface to Sunny Cove (IceLake) and later cores. Update the MSR_SPEC_CTRL emulation, and expose it to guests. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com>