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KVM: VMX: Optimize handling of VM-Entry failures in vmx_vcpu_run()
Mark the VM-Fail, VM-Exit on VM-Enter, and #MC on VM-Enter paths as 'unlikely' so as to improve code generation so that it favors successful VM-Enter. The performance of successful VM-Enter is for more important, irrespective of whether or not success is actually likely. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Message-Id: <20200410174703.1138-2-sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -6724,11 +6724,16 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
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vmx->nested.nested_run_pending = 0;
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vmx->nested.nested_run_pending = 0;
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vmx->idt_vectoring_info = 0;
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vmx->idt_vectoring_info = 0;
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vmx->exit_reason = vmx->fail ? 0xdead : vmcs_read32(VM_EXIT_REASON);
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if (unlikely(vmx->fail)) {
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if ((u16)vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY)
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vmx->exit_reason = 0xdead;
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return;
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}
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vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
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if (unlikely((u16)vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY))
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kvm_machine_check();
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kvm_machine_check();
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if (vmx->fail || (vmx->exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY))
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if (unlikely(vmx->exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY))
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return;
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return;
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vmx->loaded_vmcs->launched = 1;
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vmx->loaded_vmcs->launched = 1;
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