[Expired for qemu (Ubuntu) because there has been no activity for 60
days.]
** Changed in: qemu (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/2025987
Title:
5.15.0-76: Qemu live migration regression due to PKRU leakage
Status in linux package in Ubuntu:
Expired
Status in qemu package in Ubuntu:
Expired
Bug description:
I am trying to live migrate Qemu VMs between Amd Zen3 to Zen2 servers.
What we expect:
VMs continue to run after live-migrate
What happened:
VMs instantly get stuck after migration with 100% CPU usage.
All Nodes are running Ubuntu 22.04.
We have tested Kernel releases back to 5.15.0-70.
Nodes running Ubuntu 5.19.0-43.44~22.04.1-generic 5.19.17 :
Zen2 -> Zen3 migration: OK
Zen3 -> Zen2 migration: OK
Nodes running Ubuntu 5.15.0-76.83-generic 5.15.99 :
Zen2 -> Zen3 migration: OK
Zen3 -> Zen2 migration: NOT OK
Mixed Kernel versions:
Zen2 5.15.0-76.83-generic -> Zen3 5.19.0-43.44~22.04.1-generic -> OK
Zen3 5.19.0-43.44~22.04.1-generic -> Zen2 5.15.0-76.83-generic -> OK
Zen2 5.19.0-43.44~22.04.1-generic -> Zen3 5.15.0-76.83-generic -> OK
Zen3 5.15.0-76.83-generic -> Zen2 5.19.0-43.44~22.04.1-generic -> NOT OK
We've tested it with fresh started and with live-migrated VMs, getting
same results.
Its probably related to
KVM: SVM: fix tsc scaling cache logic
https://linux.googlesource.com/linux/kernel/git/torvalds/linux/+/11d39e8cc43e1c6737af19ca9372e590061b5ad2
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