KVM: SVM: Nullify vcpu_(un)blocking() hooks if AVIC is disabled
Nullify svm_x86_ops.vcpu_(un)blocking if AVIC/APICv is disabled as the hooks are necessary only to clear the vCPU's IsRunning entry in the Physical APIC and to update IRTE entries if the VM has a pass-through device attached. Opportunistically rename the helpers to clarify their AVIC relationship. Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20211208015236.1616697-24-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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