Guest xml(cpu portion): ... <vcpu placement='static' current='16'>32</vcpu> <resource> <partition>/machine</partition> </resource> <os> <type arch='ppc64le' machine='pseries-2.13'>hvm</type> <kernel>/home/kvmci/linux/vmlinux</kernel> <cmdline>root=/dev/sda2 rw console=tty0 console=ttyS0,115200 init=/sbin/init initcall_debug</cmdline> <boot dev='hd'/> </os> <cpu mode='host-passthrough' check='none'> <topology sockets='2' cores='2' threads='8'/> </cpu> ...
Host lscpu: # lscpu Architecture: ppc64le Byte Order: Little Endian CPU(s): 80 On-line CPU(s) list: 0,8,16,24,32,40,48,56,64,72 Off-line CPU(s) list: 1-7,9-15,17-23,25-31,33-39,41-47,49-55,57-63,65-71,73-79 Thread(s) per core: 1 Core(s) per socket: 5 Socket(s): 2 NUMA node(s): 2 Model: 2.1 (pvr 004b 0201) Model name: POWER8E (raw), altivec supported CPU max MHz: 3690.0000 CPU min MHz: 2061.0000 L1d cache: 64K L1i cache: 32K L2 cache: 512K L3 cache: 8192K NUMA node0 CPU(s): 0,8,16,24,32 NUMA node1 CPU(s): 40,48,56,64,72 -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1774605 Title: PowerPC guest does not emulate L2 and L3 cache for KVM vCPUs Status in QEMU: New Bug description: PowerPC KVM guest does not emulate L2 and L2 caches for vCPU, it would be good to have them enabled if not any known issues/limitation already with PowerPC. Host Env: kernel: 4.17.0-rc7-00045-g0512e0134582 qemu: v2.12.0-923-gc181ddaa17-dirty #libvirtd -V libvirtd (libvirt) 4.4.0 Guest Kernel: # uname -a Linux atest-guest 4.17.0-rc7-00045-g0512e0134582 #9 SMP Fri Jun 1 02:55:50 EDT 2018 ppc64le ppc64le ppc64le GNU/Linux Guest: # lscpu Architecture: ppc64le Byte Order: Little Endian CPU(s): 16 On-line CPU(s) list: 0-15 Thread(s) per core: 8 Core(s) per socket: 2 Socket(s): 1 NUMA node(s): 1 Model: 2.1 (pvr 004b 0201) Model name: POWER8 (architected), altivec supported Hypervisor vendor: KVM Virtualization type: para L1d cache: 64K L1i cache: 32K NUMA node0 CPU(s): 0-15 background: x86 enabling cpu L2 cache bydefault and L3 cache on demand for kvm guest and claims performance improvement as vcpus can be benefited with lesser `vmexits due to guest send IPIs.` with L3 cache enabled, below was patch for same. https://git.qemu.org/?p=qemu.git;a=commit;h=14c985cffa6cb177fc01a163d8bcf227c104718c To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1774605/+subscriptions