KVM: arm64: Avoid pointless annotation when mapping host-owned pages

KVM: arm64: Avoid pointless annotation when mapping host-owned pages

When a page is transitioned to host ownership, we can eagerly map it
into the host stage-2 page-table rather than going via the convoluted
step of a faulting annotation to trigger the mapping.

Call host_stage2_idmap_locked() directly when transitioning a page to
be owned by the host.

Tested-by: Fuad Tabba <tabba@google.com>
Tested-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Link: https://patch.msgid.link/20260330144841.26181-21-will@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>