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[0/2] arm64: Dealing with VHE-only CPUs

Message ID 20210325124721.941182-1-maz@kernel.org (mailing list archive)
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Series arm64: Dealing with VHE-only CPUs | expand

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Marc Zyngier March 25, 2021, 12:47 p.m. UTC 
This short series is a rewrite of [1] after some reviewing from
Will. It simplifies the esoteric "stay at EL2" path, and the feature
override code where it actually belongs, allowing us to tell the user
that no, nVHE isn't a thing on these system.

This allows the infamous M1 to boot (tested on a M1 Mini).

Hector, feel free to pull these two patches as a preamble to the next
version of your series, though I'd expect this to go via the arm64
tree for obvious reasons.

[1] https://lore.kernel.org/r/20210304213902.83903-2-marcan@marcan.st

Marc Zyngier (2):
  arm64: cpufeature: Allow early filtering of feature override
  arm64: Cope with CPUs stuck in VHE mode

 arch/arm64/kernel/cpufeature.c     |  6 ++++++
 arch/arm64/kernel/head.S           | 33 +++++++++++++++++++++++++++---
 arch/arm64/kernel/hyp-stub.S       | 15 ++++++++++----
 arch/arm64/kernel/idreg-override.c | 26 ++++++++++++++++++++++-
 4 files changed, 72 insertions(+), 8 deletions(-)