06.02.2014 12:50, Gerd Hoffmann wrote: > On Do, 2014-02-06 at 12:28 +0400, Michael Tokarev wrote: >> Since the "small" (128Kb) seabios is now built without >> support of xen, does that mean that xen will be unable >> to use qemu with -M 1.7 and before? Does it _ever_ use >> -M option like this? > > As far I know xen has its own seabios builds anyway as they > have to add hvmloader to the mix. Thats why it has been > turned off in the upstream blob builds, nobody will use these > with xen anyway.
Thank you Gerd for the answer. Ian, can you give some light here, what is still missing in seabios for xen? Because, well, .. > Not sure how all that is organized in the debian xen/seabios packages. .. debian uses upstream seabios directly with xen now, not the one which comes from xen repository. (And yes I know about http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=5f2875739beef3a75c7a7e8579b6cbcb464e61b3 which talks about >128kb bios size. This is actually exactly the same issue which I'm trying to address now, from a few PoVs: qemu now builds/uses stripped-down bios for older (pre-2.0) machine types, and that stripped-down version does not include Xen bits in order to fit in 128Kb, because with xen it doesn't fit anymore. Maybe we should start building special xen variant of seabios -- stripped down but WITH xen. Oh well.) Thanks, /mjt >> I'm asking because I don't really understand how this works. >> We updated seabios in debian to 1.7.4 (with qemu 1.7), it >> grew past 128Kb, and now I'm trying to understand what >> exactly is broken and how to fix it. I should either >> build it w/o xen support for it to fit in 128Kb again, >> or keep it at larger size and live with (migration) breakage >> caused by different bios size. > > Turn off xhci should be enough to make it fit into 128k again (used to > be the case for me last time I tried). > >> BTW, recompiling seabios-1.7.4 without xchi and a few other >> recently added stuff (pvscsi boot et al) with gcc-4.7.2 on >> debian does not produce 128Kb binary, it is larger than 128k, >> so I can't produce 128kb bios on debian anymore.. ;) > > Hmm. I had the same problem with gcc 4.4 on rhel6, but gcc 4.7+ works > for me. No idea, sorry. > > cheers, > Gerd > >
