KVM: x86: Add tlb remote flush callback in kvm_x86_ops.
This patch is to provide a way for platforms to register hv tlb remote flush callback and this helps to optimize operation of tlb flush among vcpus for nested virtualization case. Signed-off-by: NLan Tianyu <Tianyu.Lan@microsoft.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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