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Re: [Qemu-devel] 128Kb bios size and older machines?
From: |
Michael Tokarev |
Subject: |
Re: [Qemu-devel] 128Kb bios size and older machines? |
Date: |
Thu, 06 Feb 2014 17:08:09 +0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131103 Icedove/17.0.10 |
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
>
>
- [Qemu-devel] 128Kb bios size and older machines?, Michael Tokarev, 2014/02/06
- Re: [Qemu-devel] 128Kb bios size and older machines?, Gerd Hoffmann, 2014/02/06
- Re: [Qemu-devel] 128Kb bios size and older machines?,
Michael Tokarev <=
- Re: [Qemu-devel] 128Kb bios size and older machines?, Ian Campbell, 2014/02/06
- Re: [Qemu-devel] 128Kb bios size and older machines?, Michael Tokarev, 2014/02/06
- Re: [Qemu-devel] 128Kb bios size and older machines?, Ian Campbell, 2014/02/06
- Re: [Qemu-devel] 128Kb bios size and older machines?, Gerd Hoffmann, 2014/02/06
- Re: [Qemu-devel] 128Kb bios size and older machines?, Ian Campbell, 2014/02/06
- Re: [Qemu-devel] 128Kb bios size and older machines?, Paolo Bonzini, 2014/02/06
- Re: [Qemu-devel] 128Kb bios size and older machines?, Paolo Bonzini, 2014/02/06
- Re: [Qemu-devel] 128Kb bios size and older machines?, Michael Tokarev, 2014/02/07