KVM: arm64: nv: Correctly handle negative polarity FGTs

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Negative trap bits are a massive pain. They are, on the surface,
indistinguishable from RES0 bits. Do you trap? or do you ignore?

Thankfully, we now have the right infrastructure to check for RES0
bits as long as the register is backed by VNCR, which is the case
for the FGT registers.

Use that information as a discriminant when handling a trap that
is potentially caused by a FGT.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240214131827.2856277-10-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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Marc Zyngier 2024-02-14 13:18:10 +00:00 • committed by Oliver Upton

parent 0beb14de74

commit 9958d58779

1 changed files with 56 additions and 3 deletions

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arch/arm64/kvm/emulate-nested.c

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