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Handle FFA_RXTX_MAP and FFA_RXTX_UNMAP calls from the host by sharing the host's mailbox memory with the hypervisor and establishing a separate pair of mailboxes between the hypervisor and the SPMD at EL3. Co-developed-by: Andrew Walbran <qwandor@google.com> Signed-off-by: Andrew Walbran <qwandor@google.com> Signed-off-by: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20230523101828.7328-5-will@kernel.org Signed-off-by: Oliver Upton <oliver.upton@linux.dev>