Much of the marketing around Linux VDA's mentions support for "SUSE", "CentOS" or other genres of Linux. It is important that customers check both their hypervisor and VDI solutions official support matrix as both Citrix and VMware only certify, QA and support specific versions of Linux Guest OSs. Customers may find themselves unsupported by the virtualization vendors if they fail to check that the OS and specific version is supported by both their hypervisor and VDI solution (especially if mixing vendors such as Citrix XenDesktop on VMware ESXi).
Both vendors are evolving their Linux support rapidly and customers must check the documentation associated with the relevant versions of VMware/Citrix products they intend to use.
NVIDIA cannot provide support for guest OSs unsupported by the relevant virtualization vendor and as such customers are recommended to contact VMware/Citrix if they wish to use alternative versions/distributions. It is very likely many other varieties of Linux will "work" but customers should be aware that they will be unable to obtain hypervisor or VDI support in the event of an issue.
This is documented in the "Citrix XenServer® Virtual Machine User's Guide" for the relevant version of XenServer e.g. for 7.0, here: http://docs.citrix.com/content/dam/docs/en-us/xenserver/xenserver-7-0/downloads/xenserver-7-0-vm-users-guide.pdf
This can be found in the Linux VDA product documentation for the relevant version of XenDesktop under the section "System Requirements" e.g. for XenDesktop 7.9 Please see http://docs.citrix.com/en-us/xenapp-and-xendesktop/7-9/install-configure/suse-linux-vda.html
Supported Linux OSs are listed in the "VMware Compatibility Guide": https://www.vmware.com/resources/compatibility/search.php?deviceCategory=software
The versions and distributions supported by Horizon are listed in the FAQ for the appropriate release e.g. for Horizon 7, here: http://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/products/horizon/vmware-horizon-for-linux-faq.pdf
NVIDIA GRID and Quadro
vGPU and GPU pass-through
Citrix XenServer and XenDesktop
VMware ESXi/vSphere and Horizon View
Linux OSs: Ubuntu, RHEL, SUSE, CentOS, NeoKylin