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Now that SVM and VMX both probe MSRs before "defining" user return slots for them, consolidate the code for probe+define into common x86 and eliminate the odd behavior of having the vendor code define the slot for a given MSR. Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20210504171734.1434054-14-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>