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Title : How to do PCI Passthrough with VT-d
Authors : Allen Kay <allen.m.kay@intel.com>
Weidong Han <weidong.han@intel.com>
Created : October-24-2007
Updated : December-11-2007
How to turn on VT-d in Xen
--------------------------
1 ) cd xen-unstable.hg
2 ) make install
3 ) make linux-2.6-xen-config CONFIGMODE=menuconfig
4 ) change XEN->"PCI-device backend driver" from "M" to "*".
5 ) make linux-2.6-xen-build
6 ) make linux-2.6-xen-install
7 ) depmod 2.6.18.8-xen
8 ) mkinitrd -v -f --with=ahci --with=aacraid --with=sd_mod --with=scsi_mod initrd-2.6.18-xen.img 2.6.18.8-xen
9 ) cp initrd-2.6.18-xen.img /boot
10) lspci - select the PCI BDF you want to assign to guest OS
11) "hide" pci device from dom0 as following sample grub entry:
title Xen-Fedora Core (2.6.18-xen)
root (hd0,0)
kernel /boot/xen.gz com1=115200,8n1 console=com1 vtd=1
module /boot/vmlinuz-2.6.18.8-xen root=LABEL=/ ro console=tty0 console=ttyS0,115200,8n1 pciback.hide=(01:00.0)(03:00.0) pciback.verbose_request=1 apic=debug
module /boot/initrd-2.6.18-xen.img
12) reboot system
13) add "pci" line in /etc/xen/hvm.conf for to assigned devices
pci = [ '01:00.0', '03:00.0' ]
15) start hvm guest and use "lspci" to see the passthru device and
"ifconfig" to see if IP address has been assigned to NIC devices.
Caveat on Conventional PCI Device Passthrough
---------------------------------------------
VT-d spec specifies that all conventional PCI devices behind a
PCIe-to-PCI bridge have to be assigned to the same domain.
PCIe devices do not have this restriction.
VT-d Enabled Systems
--------------------
1) For VT-d enabling work on Xen, we have been using development
systems using following Intel motherboards:
- DQ35MP
- DQ35JO
2) As far as we know, following OEM systems also has vt-d enabled.
Feel free to add others as they become available.
- Dell: Optiplex 755
http://www.dell.com/content/products/category.aspx/optix?c=us&cs=555&l=en&s=biz
- HP Compaq: DC7800
http://h10010.www1.hp.com/wwpc/us/en/en/WF04a/12454-12454-64287-321860-3328898.html
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