On Mon, Dec 14, 2009 at 10:12:14PM +0100, Gerd Hoffmann wrote: > On 12/14/09 21:43, Michael S. Tsirkin wrote: >> What do we put in e.g. 0.11 compat? Any features we enable >> there might not be supported by host. > > compat properties as usual? > > Sorry, I still fail to see your problem. > > You'll have a 'disable' bitmap. Fill it via 'features=<bitmap-prop>'. > Or using separate properties for each feature. > qemu goes figure host_features. When done it masks out the features > disabled via properties. The result is used as final feature bitmap. > > -M pc-0.11 will disable hw_checksum > management software can do it too via -device virtio-net-pci,... if some > machines in the pool don't support it. And of course qemu will disable > it on its own in case the host kernel doesn't support it. > > cheers, > Gerd
management is always behind :). Imagine a new and improved qemu. I run old management. I expect to see old properties, but old management can not disable new ones :) -- MST
