QEMU in F8/9

Kevin Kofler kevin.kofler at chello.at
Mon Jul 14 20:12:02 UTC 2008

Mogens Kjaer <mk <at> crc.dk> writes:
> Before creating a virtualized process, check that the CPU does
> virtualization AND that it is enabled in the BIOS.

Actually regular QEMU doesn't use hardware virtualization, you have to use KVM 
to use it.

QEMU without kqemu = pure software emulation, no hardware support required, can 
emulate other architectures (e.g. x86_64 on a 32-bit x86 host), very slow
QEMU with kqemu = software virtualization, does not need hardware 
virtualization support, but does need kernel support (kmod-kqemu) and can only 
emulate its own architecture (e.g. no x86_64 emulation on 32-bit hosts)
KVM (which uses QEMU) = hardware virtualization using the hardware 
virtualization support in recent CPUs, needs kernel support, but such support 
is included in current upstream and Fedora kernels, can only emulate x86 and 
x86_64 (and I'm not sure whether it's possible to run x86_64 KVM VMs on a 
32-bit x86 host)

        Kevin Kofler

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