Re: [Xen-devel] [SeaBIOS] SeaBIOS causing Xen HVM VCPU Triple fault

[Ian Campbell <ijc@xxxxxxxxxxxxxx>]

(adding xen-devel too) 
On Thu, 2014-02-06 at 09:31 +0100, Gerd Hoffmann wrote:
> > commit e144bb7af49ca8756b7222a75811f3b85b0bc1f5
> > Author: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> > Date:   Mon Jun 3 16:30:18 2013 +0200
> > 
> >     usb: add xhci support
> >    
> >     $subject says all.  Support for usb3 streams is not implemented yet,
> >     otherwise it is fully functional.  Tested all usb devices supported
> >     by qemu (keyboard, storage, usb hubs), except for usb attached scsi
> >     in usb3 mode (which needs streams).
> >    
> >     Tested on qemu only, tagged with QEMU_HARDWARE because of that.
> >     Testing with physical hardware to be done.
> 
> That commit made seabios size (default qemu config, gcc 4.7+) jump from
> 128k to 256k in size because the code didn't fit into 128k any more.
> 
> Most likely the failure isn't related to xhci at all, but to the size
> change.
> 
> You can try to turn off some features (hardware support) you don't need
> to make the bios image smaller.  1.7.4 also has a config option to
> explicitly set the image size you want.
> 
> IIRC xen combines seabios and hvmloader into a single 256k image
> somehow, so it might make sense to set the seabios image size to
> something between 128k and 256k.  But better ask the xen people for
> details here.

I think this was fixed in Xen with
http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=5f2875739beef3a75c7a7e8579b6cbcb464e61b3

I suppose this should be backported to the 4.3.x stable branch.

Ian.

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