On Tue, Jul 07, 2015 at 11:06:57AM +0100, Zhichao Huang wrote: > Chazy and me are talking about how to reduce the saving/restoring > overhead for debug registers. > We want to add a state in hw_breakpoint.c to indicate whether the host > enable any hwbrpts or not (might export a fuction that kvm can call), > then we can read this state from memory instead of reading from real > hardware registers, and to decide whether we need a world switch or > not. > Does it acceptable? Maybe, hard to tell without the code. There are obvious races to deal with if you use variables to indicate whether resources are in use -- why not just trap debug access from the host as well? Then you could keep track of the "owner" in kvm and trap accesses from everybody else. Will -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
