KVM: arm64: nv: Configure HCR_EL2 for FEAT_NV2

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Add the HCR_EL2 configuration for FEAT_NV2, adding the required
bits for running a guest hypervisor, and overall merging the
allowed bits provided by the guest.

This heavily replies on unavaliable features being sanitised
when the HCR_EL2 shadow register is accessed, and only a couple
of bits must be explicitly disabled.

Non-NV guests are completely unaffected by any of this.

Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240419102935.1935571-6-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

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This commit is contained in:

Marc Zyngier 2024-04-19 11:29:25 +01:00

parent 6f57c6be2a

commit 04ab519bb8

3 changed files with 36 additions and 5 deletions

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4

arch/arm64/kvm/hyp/include/hyp/switch.h

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arch/arm64/kvm/hyp/nvhe/switch.c

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35

arch/arm64/kvm/hyp/vhe/switch.c

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