A focal 5.4 and a bionic hwe-5.4 kernel are now build for testing at PPA:
https://launchpad.net/~fheimes/+archive/ubuntu/lp1975582
respectively:
https://launchpad.net/~fheimes/+archive/ubuntu/lp1975582/+packages
They both include (top-most commits):
"s390/pgtable: use non-quiescing sske for KVM switch to keyed"
"s390/gmap: voluntarily schedule during key setting"
"KVM: s390: vsie/gmap: reduce gmap_rmap overhead"
"NFS: Fix up nfs_ctx_key_to_expire()"
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: ubuntu-z-systems
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1975582
Title:
[UBUNTU 20.04] rcu stalls with many storage key guests
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