Re: [SeaBIOS] ohci bulk?

[Avi Kivity]

On 11/22/2010 04:49 PM, Gerd Hoffmann wrote:
> > > On real hardware seabios could emulate this using SMM.
> > >
> > > On virtual hardware qemu could emulate this so we don't need SMM
> > > support in kvm.
> >
> > How hard would it be to add SMM support into kvm?
>
> Dunno.  As I understand it the biggest issue is that kvm needs 
> complete instruction emulation for big real mode as intel vmx supports 
> protected mode only.  Correct Avi?

Correct.  Note, it's likely that we have almost everything covered 
already, so it's mostly testing (beyond implementing SMM entry/exit).

However, we have a large deployed base with no SMM support, so we need a 
fallback if SMM is not available.  It's also tricky to probe for working 
SMM, I don't think there's a cpuid bit for that.