Hi Joseph,
> I built a test kernel with the requested commit.
> The test kernel can be downloaded from:
> http://kernel.ubuntu.com/~jsalisbury/lp1792957
>
> Can you test this kernel and see if it resolves this bug?
I tested this kernel in the following scenarios:
- Booted the host on a P9 machine and started an 18.04 guest using the default
parameters.
- Removed the kvm_hv module and reinstalled it using the 'one_vm_per_core'
parameter, shut down the 18.04 guest and restarted it.
➜ ~ sudo virsh destroy breno-1804
➜ ~ sudo rmmod kvm_hv
➜ ~ sudo modprobe kvm_hv one_vm_per_core=1
➜ ~ sudo virsh start --console breno-1804
On both guests I ran sysbench, as:
breno@ubuntu:~$ sysbench --threads=16 cpu run
sysbench 1.0.11 (using system LuaJIT 2.1.0-beta3)
Running the test with following options:
breno@ubuntu:~$ sysbench --threads=16 cpu run
Number of threads: 16
Initializing random number generator from current time
Prime numbers limit: 10000
Initializing worker threads...
Threads started!
CPU speed:
events per second: 33648.49
.....
Everything worked fine. I think this patch is good to get accepted.
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https://bugs.launchpad.net/bugs/1792957
Title:
Provide mode where all vCPUs on a core must be the same VM
Status in The Ubuntu-power-systems project:
In Progress
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
In Progress
Bug description:
== Comment: #0 - Leonardo Augusto Guimaraes Garcia <lagar...@br.ibm.com> -
2018-09-13 07:12:48 ==
+++ This bug was initially created as a clone of Bug #171443 +++
Please, add the following patch:
http://patchwork.ozlabs.org/patch/968786/
which adds a mode where all vCPUs on a core must be the same VM on
POWER8 and POWER9.
This is intended for use in security-conscious settings where users
are concerned about possible side-channel attacks between threads
which could perhaps enable one VM to attack another VM on the same
core, or the host.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1792957/+subscriptions
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