Meanwhile Kernel 5.13 landed in impish-release:
linux-generic | 5.13.0.14.25 | impish
hence closing this ticket with Fix Released.
** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
** Changed in: ubuntu-z-systems
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1905021
Title:
[21.10 FEAT] zKVM: Spinlock Yield Forwarding
Status in Ubuntu on IBM z Systems:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Bug description:
In a spinlock situation DIAG 9C is used by Linux to yield a CPU if it
detects that the CPU is not running via SIGP Sense Running. In KVM it
can happen that the VCPU is running but its backing thread is
scheduled on a host CPU that is not running itself. In this case the
host should issue a DIAG 9C for this CPU.
Value: Better overall performance due to reduced lock contention.
Feature will be provided via kernel >= 5.11
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