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[virt-tools-list] why -no-kvm flag?



I've upgraded qemu-kvm to 0.12.2, (as well as virt-manager: 0.8.2, and virtinst 0.500.1) and noticed
all virtual machines are extremely slow.
I noticed the qemu is now started using /usr/bin/qemu-system-x86_64 with -no-kvm switch.

I'm guessing this is working in full emulation mode and no hardware support, which explains
the slowness.

What affects the selection of the -no-kvm switch? What do I need to do to get it working
properly again?

Thanks,
Dan

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