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Unlike the kernel, vhost-user application accesses log table by mmaping it to its user space. This change adds two new fields to VhostUserMsg payload: mmap_size, and mmap_offset and make QEMU to pass the to vhost-user application in VHOST_USER_SET_LOG_BASE request. Signed-off-by: Victor Kaplansky <victork@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>