[Xen-changelog] [xen-unstable] vtd: Update vtd.txt

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1218016618 -3600
# Node ID 384f819f3ac04b8cb6cc72d94956d3c591547383
# Parent  11aaad01c5e59284a08b4f62e7bd8246673d4783
vtd: Update vtd.txt

Add "iommu=1" option in grub, due to VT-d is not enabled by default.

In addition, describes how to enable MSI/MSI-x for assigned devices.

Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
---
 docs/misc/vtd.txt |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff -r 11aaad01c5e5 -r 384f819f3ac0 docs/misc/vtd.txt
--- a/docs/misc/vtd.txt Wed Aug 06 10:54:55 2008 +0100
+++ b/docs/misc/vtd.txt Wed Aug 06 10:56:58 2008 +0100
@@ -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 : May-07-2008
+Updated : August-06-2008
 
 How to turn on VT-d in Xen
 --------------------------
@@ -21,7 +21,7 @@ 11) "hide" pci device from dom0 as follo
 
 title Xen-Fedora Core (2.6.18-xen)
         root (hd0,0)
-        kernel /boot/xen.gz com1=115200,8n1 console=com1
+        kernel /boot/xen.gz com1=115200,8n1 console=com1 iommu=1
         module /boot/vmlinuz-2.6.18.8-xen root=LABEL=/ ro xencons=ttyS 
console=tty0 console=ttyS0, pciback.hide=(01:00.0)(03:00.0)
         module /boot/initrd-2.6.18-xen.img
 
@@ -30,6 +30,11 @@ 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.
+
+
+Enable MSI/MSI-x for assigned devices
+-------------------------------------
+Add "msi=1" option in kernel line of host grub.
 
 
 Caveat on Conventional PCI Device Passthrough

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