On Tue, Jul 16, 2013 at 12:41:15AM +0200, Borislav Petkov wrote:
> Fix kvm ML already.
>
> On Tue, Jul 16, 2013 at 12:39:30AM +0200, Borislav Petkov wrote:
> > On Sun, Jul 07, 2013 at 01:18:27PM +0300, Gleb Natapov wrote:
> > > KVM does not enables emulation because QEMU called
> > > KVM_GET_EMULATED_CPUID. KVM enables emulation because QEMU sets
> > > MOVBE bit in a guest visible cpuid using KVM_SET_CPUID2. QEMU does
> > > that either because host and cpu model QEMU uses both have it, or
> > > because user asked for it specifically and KVM reports that it can
> > > be emulated. Why emulator should care what is the reason MOVBE is
> > > enabled?
> >
> > Ok, I think I know what you mean:
> >
> > diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
> > index 6fe5a838116a..c963ff8e43dd 100644
> > --- a/arch/x86/kvm/emulate.c
> > +++ b/arch/x86/kvm/emulate.c
> > @@ -3147,10 +3147,18 @@ static int em_mov(struct x86_emulate_ctxt *ctxt)
> > return X86EMUL_CONTINUE;
> > }
> >
> > +#undef F
> > +#define F(x) bit(X86_FEATURE_##x)
> > +
> > static int em_movbe(struct x86_emulate_ctxt *ctxt)
> > {
> > + u32 ebx, ecx, edx, eax = 1;
> > u16 tmp;
> >
> > + ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
> > + if (!(ecx & F(MOVBE)))
> > + return X86EMUL_PROPAGATE_FAULT;
> > +
> > switch (ctxt->op_bytes) {
> > case 2:
> > /*
> > ---
> >
> > Right?
>
Right, just replace return X86EMUL_PROPAGATE_FAULT; with return
emulate_ud(ctxt);
--
Gleb.
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