Red Hat Bugzilla – Bug 706728
qemu does not support full kqemu support
Last modified: 2013-01-09 06:51:56 EST
Description of problem:
Enable full support for kqemu.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. start Qemu Launcher
2. enable Full support for kqemu
error (see below)
/usr/bin/qemu -monitor stdio -boot d -m 512 -cdrom '/home/raphael/Downloads/Fedora/Fusion-Linux-14/Fusion-Linux-14.iso' -net nic,vlan=0 -net user,vlan=0 -localtime -kernel-kqemu &
qemu: -kernel-kqemu: invalid option
kqemu support was killed by QEMU upstream developers 2 years ago, and as such is not in Fedora any more:
Author: Anthony Liguori <email@example.com>
Date: Mon Aug 10 17:07:24 2009 -0500
Unbreak large mem support by removing kqemu
kqemu introduces a number of restrictions on the i386 target. The worst is that
it prevents large memory from working in the default build.
Furthermore, kqemu is fundamentally flawed in a number of ways. It relies on
the TSC as a time source which will not be reliable on a multiple processor
system in userspace. Since most modern processors are multicore, this severely
limits the utility of kqemu.
kvm is a viable alternative for people looking to accelerate qemu and has the
benefit of being supported by the upstream Linux kernel. If someone can
implement work arounds to remove the restrictions introduced by kqemu, I'm
happy to avoid and/or revert this patch.
N.B. kqemu will still function in the 0.11 series but this patch removes it from
the 0.12 series.
Fedora won't be patching QEMU to re-introduce this functionality, unless upstream re-introduces it, which is almost certainly never going to happen.
Reassigning to [orphaned] qemu-launcher due to it provides an option for "full" support of kqemu.
kqemu has been replaced by KVM.