On 15/12/2014 14:28, Peter Maydell wrote: > Personally I would start out with this approach. We're going to > need a "do this whole sequence atomically wrt other guest CPUs" > mechanism anyway, so it's not implementing something we wouldn't > otherwise need. And it's the simple thing to do. It's certainly > possible to do a more architecturally correct ld/st exclusive > implementation along the lines of how we manage TB invalidation > with the dirty bitmap, but if we can do without it then we > should try to keep the scope of this project constrained: it's > a big enough job as it is.
How would "add a mutex" work unless you add a mutex or CAS to each and every qemu_st operation? Paolo
