On 19/06/2015 18:20, Michael S. Tsirkin wrote: > > We could, but I/O is just an example. It can be I/O, a network ring, > > whatever. We cannot audit all address_space_map uses. > > > > No need to audit them all: defer device_add using an hva range until > address_space_unmap drops using hvas in range drops reference count to > 0. That could be forever. You certainly don't want to lockup the monitor forever just because a device model isn't too friendly to memory hot-unplug. That's why you need to audit them (also, it's perfectly in the device model's right to use address_space_unmap this way: it's the guest that's buggy and leaves a dangling reference to a region before unplugging it). Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in
