arm64: KVM: nv: Restrict S2 RD/WR permissions to match the guest's

When mapping a page in a shadow stage-2, special care must be
taken not to be more permissive than the guest is (writable or
readable page when the guest hasn't set that permission).

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
4 files changed