[Bug 277559] kldload vmm sometimes hangs kernel on arm64
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Date: Fri, 08 Mar 2024 08:17:19 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277559
Peter Grehan <grehan@FreeBSD.org> changed:
What |Removed |Added
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CC| |grehan@FreeBSD.org
--- Comment #1 from Peter Grehan <grehan@FreeBSD.org> ---
I'm going to hazard a guess this is due to the differences in capabilities
between the A53 and A72 cores (having seen a problem with that on Linux/KVM on
the same RockPro64).
The theory is that if kldload runs on an A72 core, the passed tcr_el2/vtcr_el2
values aren't compatible with A53 cores, but it's ok the other way around.
One way to see if this is the case would be to pin the kldload onto an A72
core,
and then onto an A53 core, and see if it works one way but hangs the other.
cpuset -l <cpu-num> kldload vmm.ko
where cpu-num is the number assigned to an A72 or A53 core.
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