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[Qemu-devel] [Bug 1811888] [NEW] Qemu refuses to multiboot Elf64 kernels
From: |
Lukasz Janyst |
Subject: |
[Qemu-devel] [Bug 1811888] [NEW] Qemu refuses to multiboot Elf64 kernels |
Date: |
Tue, 15 Jan 2019 19:25:33 -0000 |
Public bug reported:
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
** Affects: qemu
Importance: Undecided
Status: New
** Attachment added:
"0001-hw-i386-multiboot.c-Don-t-refuse-to-boot-ELF64-binar.patch"
https://bugs.launchpad.net/bugs/1811888/+attachment/5229414/+files/0001-hw-i386-multiboot.c-Don-t-refuse-to-boot-ELF64-binar.patch
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https://bugs.launchpad.net/bugs/1811888
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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