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Re: [Libguestfs] guestfish/libguestfs takes legacy qemu instead of kvm?



On Wed, Aug 11, 2010 at 12:10:13AM +0800, Kirby Zhou wrote:
> From: Richard W.M. Jones [mailto:rjones redhat com] 
> > On Tue, Aug 10, 2010 at 05:27:56PM +0800, Kirby Zhou wrote:
> > > Thanks very much.  BTW, I have a small question, why libguestfs
> > > depends on QEMU instead of libvirt?  If we take libvirt, we can
> > > easily run libguestfs with xen, virtualbox, vmware, etc.
> > 
> > It's considerably more complex than that.
>
> But pure QEMU is very very slow.

OK, so I think what you're asking for is to be able to run libguestfs
with KVM (ie. hardware acceleration) either alongside another
hypervisor (eg. Xen) or inside another virtual machine.

This [hardware acceleration] is indeed not possible, and so you will
fall back to using software emulation (ie. pure TCG-based qemu), and
this is somewhat slow, although at least it works!

The only solution to this is some sort of nested virt.  Since I am at
the KVM Forum at the moment, I have been emphasizing the importance to
us of having nested virt at least in KVM.  But the implementation of
nested virt is very complex.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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