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

[Lukasz Janyst <1811888@bugs.launchpad.net>]

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

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Title:
  Qemu refuses to multiboot Elf64 kernels

Status in QEMU:
  New

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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