[Expired for QEMU because there has been no activity for 60 days.]
** Changed in: qemu
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1774605
Title:
PowerPC guest does not emulate L2 and L3 cache for KVM vCPUs
Status in QEMU:
Expired
Bug description:
PowerPC KVM guest does not emulate L2 and L2 caches for vCPU, it would
be good to have them emulated to guest 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
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