On Tue, Mar 09, 2010 at 04:24:45PM +0200, Avi Kivity wrote:
> 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.
>
Will have to make it one of x86_emulate_ops callback then.
--
Gleb.
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