[SeaBIOS] ohci bulk?

[Avi Kivity]

  On 09/28/2010 02:30 AM, Kevin O'Connor wrote:
> On Mon, Sep 27, 2010 at 10:33:49AM -0700, H. Peter Anvin wrote:
> >  On 09/27/2010 10:00 AM, Avi Kivity wrote:
> >  >  What about the ISA DMA engine?
> >  >
> >
> >  The ISA DMA engine can only access the bottom 16 MiB since it only has
> >  24 address bits.
> >
> >  As far as KVM is concerned, if KVM doesn't wish to implement SMM (which
> >  really isn't all that hard -- it's pretty much a matter of dumping the
> >  state and undumping it on RSM; since SMM code is restricted to the
> >  firmware it doesn't necessarily have to be compatible with the native
> >  CPU) KVM could simply implement a custom memory-moving device -- which
> >  would be faster to boot.
>
> I didn't think kvm uses ohci today.  This issue isn't a problem at all
> with uhci or ehci.

Ok.  virtio happens to use PIO so it's safe.  lsi53c895a appears to dual 
map its registers to both an mmio and io BAR.

We'll probably have a problem with assigned GPUs, but these have their 
own firmware.

-- 
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