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Uploading for consideration by the SRU Team -- 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/1783140 Title: KVM live migration fails Status in The Ubuntu-power-systems project: In Progress Status in linux package in Ubuntu: Triaged Status in qemu package in Ubuntu: Triaged Bug description: [Impact] * Backport fix from the 2.6.2 stable branch to the qemu 2.5 in Xenial * Newer guests might use virtio attributes that are clobbered on migration with the old qemu code. [Test Case] * Setup two Xenial hosts on ppc64el * Create a guest that has a rather new kernel (>=4.14) I'd recommend Bionic * Migrate that guest from Host1 to Host2 [Regression Potential] * The modification could affect virtio handling in other cases in a non expected way, but mostly related to migrations. So the expected regression would be issues to migrate properly. I verified plenty of migrations in regression testing and we had this very code in the Yakkety release as we picked 2.6.1 stable release back then. Due to that it is actually pretty well tested and should not really regress anything out in the wild. [Other Info] * So far this only triggers on the confused endian marshalling on ppc64el, but in theory a different case could trigger it on x86 just as much. --- Environment: 2 POWER8 with Ubuntu 16.04.4 LTS as KVM hypervisor. 1 KVM guest with Ubuntu 18.04 LTS. Virtual disk for the guest is a qcow2 file on an NFS share, accessible from both hypervisors, so live migration is possible and works for all other guests (SLES, RHEL, Ubunutu 16.04), Live migratino of Ubuntu 18.04 guest fails on ppc, while the same test on an x86_64 environment suceeds. root@pkvm2:~# virsh migrate --persistent --live p8lnxtst4 qemu+ssh://pkvm1/system error: internal error: early end of file from monitor, possible problem: 2018-07-23T11:12:25.586385Z qemu-system-ppc64: VQ 0 size 0x100 Guest index 0x38aa inconsistent with Host index 0xa980: delta 0x8f2a 2018-07-23T11:12:25.586434Z qemu-system-ppc64: error while loading state for instance 0x0 of device 'pci@800000020000000:01.0/virtio-net' 2018-07-23T11:12:25.587246Z qemu-system-ppc64: load of migration failed: Operation not permitted root@pkvm2:~# uname -a Linux pkvm2 4.4.0-130-generic #156-Ubuntu SMP Thu Jun 14 08:51:21 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1783140/+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
