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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 06.02.14 at 09:36, Ian Campbell <ijc@xxxxxxxxxxxxxx> wrote:
> (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.

A patch allowing the size to be other than a power of 2 was rejected.
And I vaguely seem to recall that you actually participated in that?

> I think this was fixed in Xen with
> http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=5f2875739beef3a75c7a7e85 
> 79b6cbcb464e61b3
> 
> I suppose this should be backported to the 4.3.x stable branch.

It was backported already, and is part of 4.3.1.

Jan


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