On 15/01/2015 13:51, Frederic Konrad wrote: > > > Thanks for the reply. > > As I understand the idea of Jan is to unlock the global_mutex during tcg > execution. > Is that right? > So that means it's currently not the case and we won't be able to run > two TCG > threads at the same time?
Yes. > About the RCU, is there a lot of device which change the memory map? All PCI devices (when you program their BARs), but apart from that not much. As a first approximation, the patches on github which use CPU_INTERRUPT_TLBFLUSH should work even for multiple TCG threads. I'll clean them up a bit further so that CPU_INTERRUPT_TLBFLUSH is used for CPUs other than the running one; the running CPU instead uses tlb_flush directly. If anyone can sum up how cpu_resume_from_signal works, that would also be helpful. Paolo
