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Re: [Xen-devel] Make possible point to system seabios instead include it in hvmloader

On Mon, 2014-05-12 at 09:49 +0100, Andrew Cooper wrote:
> On 12/05/2014 09:43, Ian Campbell wrote:
> > On Sat, 2014-05-10 at 14:08 +0200, Fabio Fantoni wrote:
> >> Actually is possible specify upstream qemu and seabios from distro's 
> >> packages or custom builds with xen configure.
> >> If these are used and qemu package will be updated, xen will use updated 
> >> qemu but if seabios package will be updated, xen will use the new one 
> >> only with xen rebuild.
> > Correct.
> >
> >> If for example seabios will be updated with fixes and/or new version (in 
> >> some case required by newer qemu) xen will still have the bug fixed and 
> >> will have new bugs until will be rebuilded.
> > Correct.
> >
> >> Is possible make hvmloader point to seabios specified in configure 
> >> instead include it in hvmloader?
> > You would have to arrange for something (probably the toolstack) to load
> > the seabios file off disk and place it into guest memory as part of
> > building the domain and then you would need to invent some protocol
> > (perhaps xenstore based) so that the toolstack could signal to hvmloader
> > where to go an look for the seabios binary in guest RAM.
> Making the BIOS a multiboot module and teaching hvmloader about
> multiboot seems much simpler.

"much simpler" seems unlikely. At best I'd expect it to be about the


> The toolstack already has code for doing this in the PV case.
> ~Andrew

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