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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>
This commit is contained in:
Sean Christopherson 2020-04-10 10:47:02 -07:00 committed by Paolo Bonzini
parent b8d295f96b
commit 873e1da169
1 changed files with 8 additions and 3 deletions
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11
arch/x86/kvm/vmx/vmx.c
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@ -6724,11 +6724,16 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
vmx->nested.nested_run_pending = 0;
vmx->idt_vectoring_info = 0;
vmx->exit_reason = vmx->fail ? 0xdead : vmcs_read32(VM_EXIT_REASON);
if ((u16)vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY)
if (unlikely(vmx->fail)) {
vmx->exit_reason = 0xdead;
return;
}
vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
if (unlikely((u16)vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY))
kvm_machine_check();
if (vmx->fail || (vmx->exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY))
if (unlikely(vmx->exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY))
return;
vmx->loaded_vmcs->launched = 1;