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

[Ian Campbell <ijc@xxxxxxxxxxxxxx>]

On Fri, 2014-02-07 at 02:05 +0400, Michael Tokarev wrote:
> 07.02.2014 01:20, Moyer, Keith ÐÐÑÐÑ:
> > Thank you all for your quick, helpful replies!
> > This was about to become a headache for us, so the identification of a fix 
> > so quickly is fantastic.
> > 
> > On Thu, 2014-02-06 at 02:31 -0600, Gerd Hoffmann wrote:
> >> 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.
> > 
> > Makes sense.  Thanks for the explanation.
> > 
> > On Thu, 2014-02-06 at 02:37 -0600, Ian Campbell wrote:
> >> I think this was fixed in Xen with
> >> http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=5f2875739beef3a75c7a7e8579b6cbcb464e61b3
> > 
> > I have confirmed that applying that patch to our Xen sources fixes the 
> > problem.
> > 
> > I've filed a bug with Debian's Xen package on this matter, with the hope 
> > they'll backport that commit.
> > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=737905
> 
> Meanwhile I just uploaded another release of seabios to
> Debian archive which brings size of bios.bin back to 128Kb,
> by disabling XCHI (usb3.0) and PVSCSI -- 1.7.4-3.
> 
> So things should be working fine on debian side again now
> (at least on sid), even without patching xen.
> 
> And it looks like we should re-think what we remove from
> our (qemu) "stripped-down" bios - as it turns out, Xen
> actually uses bios from qemu unchanged...  But it is
> really really fragile - on my build (gcc 4.7), with 2
> options removed, 128Kb is 99.7% used ;)

Do the seabios packages also produce a non-stripped down seabios for
newer qemu? If so then I think the Xen package should just pick that one
up instead.

Ian.


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