hhvm_php.ini

; php options
session.save_handler = files
session.save_path = /var/lib/php5
session.gc_maxlifetime = 1440

short_open_tag = On
expose_php = Off

; hhvm specific
hhvm.log.level = Warning
hhvm.log.always_log_unhandled_exceptions = true
hhvm.log.runtime_error_reporting_level = 8191
hhvm.mysql.typed_results = false

nginx_default.conf

server {
        listen 80 default_server;
        listen [::]:80 default_server ipv6only=on;

        root /var/www/concrete5-5.7.0/web;
        index index.php index.html;

        server_name localhost;
        server_tokens off;

        location / {
                if (-f $request_filename) {
                        expires 14d;
                        break;
                }
                if (!-e $request_filename) {
                        rewrite ^(.+)$ /index.php/$1 last;
                }
        }

        location ~ ^(.+\.php)(.*)$ {
                fastcgi_split_path_info ^(.+\.php)(/.+)$;
                fastcgi_pass 127.0.0.1:9000;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
                fastcgi_param PATH_INFO $fastcgi_path_info;
                include fastcgi_params;
        }
}