[xen-unstable] docs: vtd.txt doc change

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[xen-unstable] docs: vtd.txt doc change

Xen patchbot-unstable
# HG changeset patch
# User Keir Fraser <[hidden email]>
# 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 <[hidden email]>
---
 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    <[hidden email]>
           Weidong Han  <[hidden email]>
 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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