On 15/01/2015 12:14, Alexander Graf wrote: >> > >> > Once you have >1 VCPU thread you'll need the RCU work that I am slowly >> > polishing and sending out. That's because one device can change the >> > memory map, and that will cause a tlb_flush for all CPUs in tcg_commit, >> > and that's not thread-safe. > You'll have a similar problem for tb_flush() if you use a single tb > cache. Just introduce a big hammer function for now that IPIs all the > other threads, waits until they halted, do the atomic instruction (like > change the memory map or flush the tb cache), then let them continue.
For the memory map I played with just using cpu_interrupt instead of waiting for the halt of the other CPUs. That's safe for 1 VCPU thread, but not for >1 thread. Perhaps we can exit the other CPUs with a signal and cpu_resume_from_signal. Paolo
