On Mon, Dec 21, 2009 at 12:22:53PM +0100, Alexander Graf wrote: > > On 21.12.2009, at 12:18, Michael S. Tsirkin wrote: > > > On Mon, Dec 21, 2009 at 01:12:26PM +0200, Avi Kivity wrote: > >> On 12/20/2009 07:18 PM, Michael S. Tsirkin wrote: > >>> > >>>>> Hmm, then, shouldn't either kvm or qemu mask features that we do not > >>>>> emulate well enough to make windows not crash? > >>>>> > >>>> -cpu host does that already, no? > >>>> > >>>> Alex > >>>> > >>> I expected so, but Avi here seems to say windows will crash if you > >>> use a new CPU with it ... > >>> > >> > >> No, Windows tries to detect changes in your hardware and assumes that if > >> too many things change, you might be a pirate and requires you to phone > >> their offices to re-authenticate. > > > > How often does a casual user upgrade his host CPU? > > I tend to have my VM images on an NFS share and expect them to work properly > on all PCs I work on. > So I guess the answer is "often"? > > Alex
Yes but you are not a casual user, are you? Consider a 64 bit guest to see why moving a VM across machines needs some planning. -- MST
