# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1197454784 0
# Node ID ca077fa59206082270f64e0e19d24885877d50f2
# Parent 12cf63d3e4a211dd3c02a408e87b936b593cdd61
docs: vtd.txt doc change
Added a note on conventional PCI device passthrough.
Signed-off-by: Allen Kay <allen.m.kay@xxxxxxxxx>
---
docs/misc/vtd.txt | 14 ++++++++++++--
1 files changed, 12 insertions(+), 2 deletions(-)
diff -r 12cf63d3e4a2 -r ca077fa59206 docs/misc/vtd.txt
--- a/docs/misc/vtd.txt Wed Dec 12 10:08:54 2007 +0000
+++ b/docs/misc/vtd.txt Wed Dec 12 10:19:44 2007 +0000
@@ -2,7 +2,7 @@ Authors : Allen Kay <allen.m.kay@inte
Authors : Allen Kay <allen.m.kay@xxxxxxxxx>
Weidong Han <weidong.han@xxxxxxxxx>
Created : October-24-2007
-Updated : October-24-2007
+Updated : December-11-2007
How to turn on VT-d in Xen
--------------------------
@@ -22,7 +22,7 @@ title Xen-Fedora Core (2.6.18-xen)
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 maxcpus=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
@@ -30,6 +30,15 @@ 13) add "pci" line in /etc/xen/hvm.conf
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
@@ -48,3 +57,4 @@ http://www.dell.com/content/products/cat
- HP Compaq: DC7800
http://h10010.www1.hp.com/wwpc/us/en/en/WF04a/12454-12454-64287-321860-3328898.html
+
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