On Tue, Sep 11, 2012 at 11:39:01AM -0300, Marcelo Tosatti wrote: > On Tue, Sep 11, 2012 at 12:18:22PM +0300, Avi Kivity wrote: > > > The same can happen with slot deletion, for example. > > > > > > Userspace (which performed the modification which can result in faults > > > to non-existant/read-only/.../new-tag memslot), must handle the faults > > > properly or avoid the possibility for reference to memslot information > > > from the past. > > > > > > I think its worthwhile to add a note about this in the API > > > documentation: "The user of this interface is responsible for handling > > > references to stale memslot information, either by handling > > > exit notifications which reference stale memslot information or not > > > allowing these notifications to exist by stopping all vcpus in userspace > > > before performing modifications to the memslots map". > > > > Or we can drop the new interface and rely on userspace to perform the > > lookup under its own locking rules. > > > > It's slow, but writes to ROM or ROM/device are rare anyway. > > Lookup what information?
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