KVM: arm64: Allow userspace to limit NV support to nVHE

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NV is hard. No kidding.

In order to make things simpler, we have established that NV would
support two mutually exclusive configurations:

- VHE-only, and supporting recursive virtualisation

- nVHE-only, and not supporting recursive virtualisation

For that purpose, introduce a new vcpu feature flag that denotes
the second configuration. We use this flag to limit the idregs
further.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Link: https://lore.kernel.org/r/20250220134907.554085-11-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

...

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Marc Zyngier 2025-02-20 13:49:03 +00:00 • committed by Oliver Upton

parent 94f296dcd6

commit f83c41fb3d

2 changed files with 27 additions and 2 deletions

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arch/arm64/include/uapi/asm/kvm.h

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arch/arm64/kvm/nested.c

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