oz-install failed with message "qemu-system-x86_64: warning: host doesn't support requested feature"
Solution 1:
The problem doesn't matter to the Linux kernel but the syntax in .tdl file.
After I replaced install type='url' with install type='iso', it worked.
Here is the correct answer to me:
<install type='iso'>
<iso>file:///home/corey/CentOS-7-x86_64.iso</iso>
</install>