Thanks for reporting this bug. The 'kvm' package shouldn't really exist. The bug you're referring to is in the kernel kvm code, so I'm marking it as affecting the kernel. (If it were in the userspace qemu package, then the 'qemu' package would be the right bug target).
** Package changed: kvm (Ubuntu) => linux (Ubuntu) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1567159 Title: Ubuntu 15.10: After hot plug vcpu, kvm_arch->use_master_clock will never be true. Status in linux package in Ubuntu: New Bug description: 1. In function kvm_write_tsc, when tsc first matched, do kvm->arch.nr_vcpus_matched_tsc++; 2. In function pvclock_update_vm_gtod_copy, if vcpus_matched (also with other conditions meet), ka->use_master_clock will be true; 3. After hot plug vcpu, kvm_arch_vcpu_postcreate and Qemu will call kvm_write_tsc for the new vcpu. Because the tsc will not match, so do kvm->arch.nr_vcpus_matched_tsc = 0; 4. For other already existed vcpu will not call kvm_write_tsc, so will not do kvm->arch.nr_vcpus_matched_tsc++; 5. So vcpus_matched in function pvclock_update_vm_gtod_copy will be false forever, this cause ka->use_master_clock will never be true; To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1567159/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
