On 01.09.14 11:01, Mihai Caraman wrote: > ePAPR represents hardware threads as cpu node properties in device tree. > So with existing QEMU, hardware threads are simply exposed as vcpus with > one hardware thread. > > The e6500 core shares TLBs between hardware threads. Without tlb write > conditional instruction, the Linux kernel uses per core mechanisms to > protect against duplicate TLB entries. > > The guest is unable to detect real siblings threads, so it can't use the > TLB protection mechanism. An alternative solution is to use the hypervisor > to allocate different lpids to guest's vcpus that runs simultaneous on real > siblings threads. On systems with two threads per core this patch halves > the size of the lpid pool that the allocator sees and use two lpids per VM. > Use even numbers to speedup vcpu lpid computation with consecutive lpids > per VM: vm1 will use lpids 2 and 3, vm2 lpids 4 and 5, and so on. > > Signed-off-by: Mihai Caraman <mihai.caraman@xxxxxxxxxxxxx> Thanks, applied both to kvm-ppc-queue. Alex -- 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
