[Bug 277559] kldload vmm sometimes hangs kernel on arm64

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From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 11 Apr 2024 00:15:36 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277559

--- Comment #6 from John F. Carr <jfc@mit.edu> ---
I noticed that the instruction cache types are different for the two processor
types.  A-53 is virtually indexed and A-72 is physically indexed.

Cache Type = <64 byte D-cacheline,64 byte I-cacheline,VIPT ICache,64 byte
ERG,64 byte CWG>
Cache Type = <64 byte D-cacheline,64 byte I-cacheline,PIPT ICache,64 byte
ERG,64 byte CWG>

When changing address translation for EL2 code, are any cache clean operations
required?  handle_hyp_init currently contains a TLB flush and isb.

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