[Bug 1811888] Re: Qemu refuses to multiboot Elf64 kernels

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to another 
system. For this we need to know which bugs are still valid and which could be 
closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state 
back to "New" within the next 60 days, otherwise this report will be marked as 
"Expired". Or mark it as "Fix Released" if the problem has been solved with a 
newer version of QEMU already. Thank you and sorry for the inconvenience.


** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1811888

Title:
  Qemu refuses to multiboot Elf64 kernels

Status in QEMU:
  Incomplete

Bug description:
  Qemu does not multiboot Elf64 bit kernels when emulating x86_64
  systems. This is unfortunate because it renders the `-kernel` option
  quite useless. It's true that a multiboot compatible bootloader puts
  you in protected mode by default, and you have to set up the long mode
  yourself. While it is easy to put such 32-bit bootstrap code in a 64
  bit binary, it is not possible to compile a 64 bit kernel into a 32
  bit binary.

  After quick search, it turned out that loading 64 bit elf binaries has
  been disabled to be compatible with GRUB. However, since that time,
  both GRUB and Syslinux load 64 bit ELF kernels just fine, which makes
  qemu incompatible with them. Furthermore, it seems that this feature
  does and has always worked fine and that people have since submitted
  patches to re-enable it.

  https://patchwork.ozlabs.org/patch/62142/
  https://patchwork.kernel.org/patch/9770523/

  Please consider applying the attached patch.

  Best Regards,
  Lukasz Janyst

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