It appears that CentOS 7 cannot work with paravirtualized drivers with XenServer 6.2

I’ve installed one PVHVM guest with the xs-tools package but the drivers fails to connect at bootime.

I got this message on the dmesg, on the DomU:

```
[    0.000000] Xen Platform: blacklisted by host

```

When I would expect to receive those ones:

```
[    0.000000] Netfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated NICs.
[    0.000000] Blkfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated disks.

```

And in the Dom0 in got the corresponding messages:

```
Jul 11 15:39:03 xenserver1 fe: qemu-dm-53[2380]: UNPLUG: protocol version set to 1 (drivers not blacklisted)
Jul 11 15:39:03 xenserver1 fe: qemu-dm-53[2380]: UNPLUG: protocol 1 active
Jul 11 15:39:03 xenserver1 fe: qemu-dm-53[2380]: UNPLUG: product_id: 3 build_number: 1
Jul 11 15:39:03 xenserver1 fe: qemu-dm-53[2380]: UNPLUG: drivers blacklisted
Jul 11 15:39:04 xenserver1 fe: qemu-dm-53[2380]: vga s->lfb_addr = f1000000 s->lfb_end = f1800000 

```

Due this problem I’m stuck using the emulated Realtek Fast Ethernet driver, and I would like to know it's something possible to workarround this problem or even a real solution.

XenServer 6.2 is getting really dated today, and I'm afraid that there are under the hood incompatibilities that will not enable CentOS 7 in its glory using XenServer 6.2.