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KVM: VMX: Restore host's MSR_IA32_RTIT_CTL when it's not zero
A minor optimization to WRMSR MSR_IA32_RTIT_CTL when necessary. Opportunistically refine the comment to call out that KVM requires VM_EXIT_CLEAR_IA32_RTIT_CTL to expose PT to the guest. Reviewed-by: Sean Christopherson <[email protected]> Signed-off-by: Xiaoyao Li <[email protected]> Message-Id: <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
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