Re: [Qemu-devel] Merging improvements from VirtualBox OSE into qemu?

[Liraz Siri]

Avi Kivity wrote:

> There's nothing magical about it.  Most likely they switch to 64-bit
> mode immediately before entering the guest, and switch back immediately
> after the guest exits.  In effect their turning the host OS into a
> hybrid 32/64 bit kernel (with the vast majority of the code remaining
> 32-bits).

Sounds easy! Why, I bet one of those KVM wizards could do that over the
weekend, being so smart and all... ;)

Pardon my ignorance, but is it possible to switch to 64-bit mode in
userspace, or do you absolutely need kernel-level support to do that?

Cheers,
Liraz