On Fri, Jan 23, 2015 at 03:48:28PM +0100, Gerd Hoffmann wrote:
> Hi,
>
> > > Also seabios wouldn't map the bar
> > > above 4G.
>
> > We can teach it to do that, and even if not, OS can do it on hotplug.
>
> Just to clarify: seabios can do it in the general case, it just wouldn't
> do it for xhci specifically because otherwise the seabios xhci driver
> wouldn't be able to reach the registers any more ...
>
> For non-transitional virtio-{blk,scsi,net} devices seabios (and ipxe)
> would have a simliar problem btw: When mapping the bars above 4G it
> can't handle the devices any more.
You can always use the config cap for this.
I didn't implement it yet, but I will.
> But we'll probably stick to transitional by default for a while (where
> seabios can just use the legacy registers in io address space),
io *is* very crowded. I think we should try and code up modern drivers
when we have the time.
> and
> there also is ovmf coming which runs in 64bit mode so mapping the bars
> high isn't a problem there.
>
> cheers,
> Gerd
>
