Re: [Qemu-devel] [PATCH] Increase max -kernel size

[Thiemo Seufer <ths@networkno.de>]

Daniel Jacobowitz wrote:
> On Tue, Mar 27, 2007 at 08:16:40PM +0100, Thiemo Seufer wrote:
> > Gwenole Beauchesne wrote:
> > > Hi,
> > > 
> > > The following patch increases max kernel size to 8 MB when qemu is invoked 
> > > with -kernel and -initrd. Otherwise, x86_64 kernel panics when loading the 
> > > initrd (e.g. <Cooker>/x86_64/isolinux/alt0/{vmlinuz,all.rdz}).
> > 
> > I would like a patch which adjusts the initrd load address dynamically,
> > depending on the kernel load size, instead of hardcoding just a
> > different magic number.
> 
> Note, that does not readily work - this is where we load the
> compressed kernel image and initrd, but what matters is the size it
> gets uncompressed to.

I think what matters is the space taken by (uncompressed and loaded)
kernel ALLOC segments. Everything above that should be ok to load a
ramdisk.

IOW, the ELF loader would need to return the topmost address it came
across, including .bss-like parts. The up-aligned value would become
the initrd load address.


Thiemo