KVM: arm64: nv: Emulate EL12 register accesses from the virtual EL2

KVM: arm64: nv: Emulate EL12 register accesses from the virtual EL2

With HCR_EL2.NV bit set, accesses to EL12 registers in the virtual EL2
trap to EL2. Handle those traps just like we do for EL1 registers.

One exception is CNTKCTL_EL12. We don't trap on CNTKCTL_EL1 for non-VHE
virtual EL2 because we don't have to. However, accessing CNTKCTL_EL12
will trap since it's one of the EL12 registers controlled by HCR_EL2.NV
bit.  Therefore, add a handler for it and don't treat it as a
non-trap-registers when preparing a shadow context.

These registers, being only a view on their EL1 counterpart, are
permanently hidden from userspace.

Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Jintack Lim <jintack.lim@linaro.org>
[maz: EL12_REG(), register visibility]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230209175820.1939006-17-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>