https://imanudin.net/2015/03/04/how-to-install-proxmox-nested-on-vmware-esxi-full-support-openvz-kvm/

安装完后出现错误    TASK ERROR: No accelerator found!

Open extension VMX file using Wordpad application (do not use Notepad)
– Add the following line at the bottom

vhv.enable = "TRUE"

– Save and upload again VMX file to the folder name Proxmox VM
– Run again Proxmox VM and run the following command after login to Proxmox whether has been supported Virtualization or not

egrep -c ‘(vmx|svm)‘ /proc/cpuinfo

If the result of the above command is zero (0), your Proxmox is not support Virtualization. If the result is 1 or more, your Proxmox has been supported Virtualization.

How To Install Proxmox Nested on VMware ESXi (Full Support OpenVZ & KVM)