On Tue, 25 Jan 2022 00:39:28 +1000, Nicholas Piggin wrote:
> The decrementer exception can fail to be cleared when the interrupt
> returns in the case where the decrementer wraps with the next timer
> still beyond decrementer_max. This results in a decrementer interrupt
> storm. This is triggerable with small decrementer system with hard
> and soft watchdogs disabled.
>
> Fix this by always programming the decrementer if there was no timer.
>
> [...]
Patch 2 & 3 applied to powerpc/next.
[2/3] powerpc/time: Fix KVM host re-arming a timer beyond decrementer range
https://git.kernel.org/powerpc/c/cf74ff52e352112be78c4c4c3637a37ec36a6608
[3/3] powerpc/time: improve decrementer clockevent processing
https://git.kernel.org/powerpc/c/35de589cb8793573ed56a915af9cb4b5f15ad7d7
cheers
