Hi, I am looking at the source code of KVM. I am very curious how the IPI is emulated between different vcpus. I found that before one vcpu is about to send the IPIs to other vcpu. The received side will always exit with reason 12 (EXIT_REASON_HLT) first, then the send side send the IPI. after that the send side will exit with 12(EXIT_REASON_HLT) again. The receive side can enter guest again. I don't know whether how IPI works or it's a special case. How can the KVM (or guest) could ensure that the IPI receive side stay in VM_EXIT state before the send side send the IPI. Thanks for your time! Best Wishes, Yaohui -- 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
