On 03/09/2010 04:09 PM, Gleb Natapov wrote:
Eliminate the need to call back into KVM to get it from emulator. @@ -3499,6 +3499,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu, vcpu->arch.emulate_ctxt.vcpu = vcpu; vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu); + vcpu->arch.emulate_ctxt.cpl = kvm_x86_ops->get_cpl(vcpu); vcpu->arch.emulate_ctxt.mode = (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL : (vcpu->arch.emulate_ctxt.eflags& X86_EFLAGS_VM)
This is an unconditional VMREAD, which is slow (extra slow if nested). Most common emulator ops do not need the cpl.
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