[SeaBIOS] ohci bulk?
avi at redhat.com
Tue Nov 23 07:22:55 CET 2010
On 11/23/2010 02:24 AM, Kevin O'Connor wrote:
> 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.)
Okay, then it's simply a matter of implementing SMM entry and RSM,
adding save/restore support, and interfaces for asserting #SMI.
> > 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.
Which PCI device is that?
When you say "tries", do you mean it allows for failure?
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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