exec: Implement subpage_read/write via address_space_rw
This will allow to add support for unaligned memory regions: the subpage container region can activate unaligned support unconditionally because the read/write handler will now ensure that accesses are split as required by calling address_space_rw. We can furthermore drop the special handling of RAM subpages, address_space_rw takes care of this already. Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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