[SeaBIOS] ohci bulk?

Kevin O'Connor kevin at koconnor.net
Tue Nov 23 01:24:56 CET 2010

On Mon, Nov 22, 2010 at 05:45:49PM +0200, Avi Kivity wrote:
> On 11/22/2010 04:49 PM, Gerd Hoffmann wrote:
> >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).

The big real mode support needed for SMM is no greater than the big
real mode supported needed for option roms.  Since option roms work
today, I'm not sure what more is needed.  (I recall there being a
problem with %eip>64K, but there's no reason to do that in SMM so I
don't think it is an issue.)

> 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.

There's already a check for this today - if a specific PCI device
exists then seabios tries to setup SMM, otherwise it doesn't.


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