Revert "KVM: arm64: nv: Fix RESx behaviour of disabled FGTs with negative polarity"

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This reverts commit eb9d53d4a9.

As Marc pointed out on the list [*], this patch is wrong, and those who
find themselves in the SOB chain should have their heads checked.

Annoyingly, the architecture has some FGT trap bits that are negative
(i.e. 0 implies trap), and there was some confusion how KVM handles
this for nested guests. However, it is clear now that KVM honors the
RES0-ness of FGT traps already, meaning traps for features never exposed
to the guest hypervisor get handled at L0. As they should.

Link: https://lore.kernel.org/kvmarm/86bk3c3uss.wl-maz@kernel.org/T/#mb9abb3dd79f6a4544a91cb35676bd637c3a5e836
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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Oliver Upton 2024-07-08 19:50:51 +00:00

parent 3dc14eefa5

commit cb52b5c8b8

1 changed files with 12 additions and 12 deletions

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arch/arm64/kvm/nested.c

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