------- Comment From lagar...@br.ibm.com 2017-03-27 13:44 EDT------- Thanks, Christian. I agree that, in this case, there isn't much we can do in QEMU.
-- 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/1664622 Title: qemu: Missing transaction memory advertisement Status in linux package in Ubuntu: Fix Released Status in qemu package in Ubuntu: Fix Released Status in qemu source package in Xenial: Incomplete Status in qemu source package in Yakkety: Incomplete Bug description: [Impact] * The non HW assisted virtualization (kvm-pr) on PowerPC announces support for the Transactional memory feature but does not fully support it. Due to that guests crash. * The fix essentially takes away the TM feature by default and only enables it incertain cases where it is correct (right HW and recent KVM-HV implementation) [Test Case] * Repro 1. install uvtool-libvirt in Host 2. uvt-simplestreams-libvirt sync --source http://cloud-images.ubuntu.com/daily arch=ppc64el label=daily release=xenial 3. $ cat /home/ubuntu/ppc-template.xml <domain type='kvm'> <os> <type>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <devices> <interface type='network'> <source network='default'/> <model type='virtio'/> </interface> <serial type='pty'> <source path='/dev/pts/3'/> <target port='0'/> </serial> <graphics type='vnc' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> </graphics> <video/> </devices> </domain> 4. $ uvt-kvm create --memory 4096 --template /home/ubuntu/ppc-template.xml --password=ubuntu --ssh-public-key-file /home/ubuntu/.ssh/authorized_keys kvmguest-xenial-level1 release=xenial arch=ppc64el label=daily 5. log into this guest (all following steps are in level1 guest to spawn a level2 guest) 6. ensure kvm_pr is loaded correctly This is in the extras package which is not installed by default (other bug). Get it with $ apt-get install linux-image-extra-virtual $ modprobe kvm_pr $ lsmod | grep kvm_pr 7. make sure libvirt default network can start in 2nd level There likely is a network collision, use virsh net-edit to dix and then virsh net-start to start the network 8. Get Original Xenial Ubuntu image wget http://old-releases.ubuntu.com/releases/16.04.0/ubuntu-16.04-server-ppc64el.iso 9. sudo apt install virtinst 10. $ virt-install --virt-type=kvm --cpu=host --name=nested-xenial --controller type=scsi,model=virtio-scsi --graphics none --console pty,target_type=serial --disk path=/home/ubuntu/test-xenial-virt-inst.qcow2,size=4 --vcpus=4 --ram=2048 --os-type=linux --os-variant ubuntu16.04 --network bridge=virbr0,model=virtio --cdrom=ubuntu-16.04-server-ppc64el.iso 11. See crash on guest install/boot * Installing the fixed qemu in the 1st level (not on Bare Metal) before retrying step 11 should show the issue being fixed [Regression Potential] * It is changing features announced to the guest, but then it is only taking it away in cases it won't work * The change is ppc64el "only" which restricts the audience to be hit by regressions and even there kvm_pr (problem state virtualization) is a rare case usually only for Testing/CI * Changes are upstream in qemu a while now without being revoked and come from IBM themselves. ------- == Comment: #0 - Breno Henrique Leitao <bren...@br.ibm.com> - 2017-02-14 10:03:03 == We don't support transactional memory in PR KVM, so don't tell the OS that we do. These are the required patches: commit 2e68f28854f0120c9a938a61b64aaf1eaecb162b Author: Thomas Huth <th...@redhat.com> Date: Wed Sep 28 13:16:30 2016 +0200 ppc: Check the availability of transactional memory KVM-PR currently does not support transactional memory, and the implementation in TCG is just a fake. We should not announce TM support in the ibm,pa-features property when running on such a system, so disable it by default and only enable it if the KVM implementation supports it (i.e. recent versions of KVM-HV). These changes are based on some earlier work from Anton Blanchard (thanks!). Signed-off-by: Thomas Huth <th...@redhat.com> Reviewed-by: C?dric Le Goater <c...@kaod.org> Signed-off-by: David Gibson <da...@gibson.dropbear.id.au> (cherry picked from commit bac3bf287ab60e264b636f5f00c116a19b655762) commit 45a4f18e2ec40b96893c780c28ab18c246906355 Author: Thomas Huth <th...@redhat.com> Date: Wed Sep 28 13:16:29 2016 +0200 hw/ppc/spapr: Fix the selection of the processor features The current code uses pa_features_206 for POWERPC_MMU_2_06, and for everything else, it uses pa_features_207. This is bad in some cases because there is also a "degraded" MMU version of ISA 2.06, called POWERPC_MMU_2_06a, which should of course use the flags for 2.06 instead. And there is also the possibility that the user runs the pseries machine with a POWER5+ or even 970 processor. In that case we certainly do not want to set the flags for 2.07, and rather simply skip the setting of the pa-features property instead. Signed-off-by: Thomas Huth <th...@redhat.com> Reviewed-by: C?dric Le Goater <c...@kaod.org> Signed-off-by: David Gibson <da...@gibson.dropbear.id.au> (cherry picked from commit 4cbec30d769a73853b60dc7f275e6e7da9ab5162) commit 5c179666057a7568306062e2cd030042a25eb57a Author: Thomas Huth <th...@redhat.com> Date: Wed Sep 28 13:16:28 2016 +0200 hw/ppc/spapr: Move code related to "ibm,pa-features" to a separate function The function spapr_populate_cpu_dt() has become quite big already, and since we likely have to extend the pa-features property for every new processor generation, it is nicer if we put the related code into a separate function. Signed-off-by: Thomas Huth <th...@redhat.com> Reviewed-by: C?dric Le Goater <c...@kaod.org> Signed-off-by: David Gibson <da...@gibson.dropbear.id.au> (cherry picked from commit 230bf719d3a3b144a4ffa441e5d6170ef0ad8999) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1664622/+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
