p...@au1.ibm.com - what are the 2 commits ? I can only see commit
fa73c3b25bd8 ("KVM: PPC: Book3s PR: Allow access to unprivileged MMCR2
register", 2016-09-21) mentioned.-- 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/1634129 Title: Couldn't emulate instruction 0x7813427c Status in linux package in Ubuntu: New Bug description: Couldn't emulate instruction 0x7813427c ------------------------------------------------------- Cannot boot nested VMs in Xenial or Yakkety w/ kvm accel. It worked until Vivid (in spite of not being possible in x86) TCG mode works fine, but very slow. TCG full emulation is the mode in the x86 world for nested virt. However, in Power, we've been using in OpenStack CI w/ kvm accel (native virtualization) to speed up 2nd level VMs. It worked until Vivid. Is the case that kvm accel isn't possible anymore for nested virt (aligned with x86 KVM) ? So full emulation TCG mode is the only possible mode in newer kernels ? qemu-system-ppc64le -machine pseries,accel=kvm,usb=off -m 1G -enable- kvm -cpu POWER8E -display none -nographic cirros-d161007-ppc64le- disk.img lsmod |grep kvm kvm_pr 96452 1 kvm 152984 4 kvm_pr Nested VM console: OF stdout device is: /vdevice/vty@71000000 Preparing to boot Linux version 4.4.0-28-generic (buildd@bos01-ppc64el-018) (gcc version 5.3.1 20160413 (Ubuntu/IBM 5.3.1-14ubuntu2.1) ) #47-Ubuntu SMP Fri Jun 24 10:09:20 UTC 2016 (Ubuntu 4.4.0-28.47-generic 4.4.13) Detected machine type: 0000000000000101 Max number of cores passed to firmware: 2048 (NR_CPUS = 2048) Calling ibm,client-architecture-support... done command line: BOOT_IMAGE=/boot/vmlinux-4.4.0-28-generic LABEL=cirros-rootfs ro memory layout at init: memory_limit : 0000000000000000 (16 MB aligned) alloc_bottom : 0000000004210000 alloc_top : 0000000010000000 alloc_top_hi : 0000000040000000 rmo_top : 0000000010000000 ram_top : 0000000040000000 found display : /pci@800000020000000/vga@0, opening... done instantiating rtas at 0x000000000daf0000... done prom_hold_cpus: skipped copying OF device tree... Building dt strings... Building dt structure... Device tree strings 0x0000000004220000 -> 0x0000000004220aa9 Device tree struct 0x0000000004230000 -> 0x0000000004240000 Quiescing Open Firmware ... Booting Linux via __start() ? <The nested VM hangs here> /var/log/syslog & /var/log/kern.log Oct 13 14:07:38 patricia-ub16-10 kernel: [64072.186975] kvmppc_handle_exit_pr: emulation at 700 failed (7813427c) Oct 13 14:07:38 patricia-ub16-10 kernel: [64072.187023] Couldn't emulate instruction 0x7813427c (op 30 xop 318) Oct 13 14:07:38 patricia-ub16-10 kernel: [64072.187066] kvmppc_handle_exit_pr: emulation at 700 failed (7813427c) Oct 13 14:07:38 patricia-ub16-10 kernel: [64072.187113] Couldn't emulate instruction 0x7813427c (op 30 xop 318) Oct 13 14:07:38 patricia-ub16-10 kernel: [64072.187156] kvmppc_handle_exit_pr: emulation at 700 failed (7813427c) <syslog and kern.log fills up with this error forever, until get the disk full> Host: cpu : POWER8E (raw), altivec supported clock : 3690.000000MHz revision : 2.1 (pvr 004b 0201) timebase : 512000000 platform : PowerNV model : 8247-22L machine : PowerNV 8247-22L firmware : OPAL v3 Guest: Xenial or Yakkety Description: Ubuntu 16.10 Release: 16.10 Codename: yakkety Nested VM: CirrOS http://download.cirros-cloud.net/daily/20161007/cirros-d161007-ppc64le-disk.img This seems to be related https://patchwork.kernel.org/patch/9121881/ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1634129/+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
