KVM: arm64: Account for RES1 bits in DECLARE_FEAT_MAP() and co

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None of the registers we manage in the feature dependency infrastructure
so far has any RES1 bit. This is about to change, as VTCR_EL2 has
its bit 31 being RES1.

In order to not fail the consistency checks by not describing a bit,
add RES1 bits to the set of immutable bits. This requires some extra
surgery for the FGT handling, as we now need to track RES1 bits there
as well.

There are no RES1 FGT bits *yet*. Watch this space.

Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Sascha Bischoff <sascha.bischoff@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20251210173024.561160-5-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

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This commit is contained in:

Marc Zyngier 2025-12-10 17:30:22 +00:00

parent a035001dea

commit c259d763e6

3 changed files with 45 additions and 36 deletions

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1

arch/arm64/include/asm/kvm_host.h

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arch/arm64/kvm/config.c

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53

arch/arm64/kvm/emulate-nested.c

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