Mixed Virtualhosts and IP hosts

[David]

Hello,

I have 2-3 IPs.

I would like 2 IPs to be IP based hosts, and the 3rd IP to host 
my virtualhosted sites.

Currently I have setup each domain with it's own config file 
that is called into nginx.conf inside the http {} section.

The IP based hosts are working fine, but I would like to check if 
I am doing things right for the virtual hosts.

Each virtual host looks like this:

server {
        listen          xxx.xxx.xxx.xxx;
        server_name     sub.domain.com www.sub.domain.com;
        access_log      /var/log/nginx/sub.domain.com.access.log main;

        location / {
                index   index.php index.html;
                root    /home/subdomain/public_html/images;
        }

}

So each virtualhost has the same IP.

Will this work ok ? or do all virtualhosts need to be in their 
own http {} section ?

Thank you