From 4e3c592c93d7dbe02ca36878457515d30fe931d2 Mon Sep 17 00:00:00 2001
From: Jan Beulich <jbeulich@suse.com>
Date: Mon, 7 Jan 2013 12:58:09 +0100
Subject: IOMMU: add option to specify devices behaving like ones using phantom
 functions

At least certain Marvell SATA controllers are known to issue bus master
requests with a non-zero function as origin, despite themselves being
single function devices.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: "Zhang, Xiantao" <xiantao.zhang@intel.com>
---
 docs/misc/xen-command-line.markdown | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'docs')

diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown
index 443685e904..6ad63094b2 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -703,6 +703,16 @@ Defaults to booting secondary processors.
 
 Default: `on`
 
+### pci-phantom
+> `=[<seg>:]<bus>:<device>,<stride>`
+
+Mark a group of PCI devices as using phantom functions without actually
+advertising so, so the IOMMU can create translation contexts for them.
+
+All numbers specified must be hexadecimal ones.
+
+This option can be specified more than once (up to 8 times at present).
+
 ### ple\_gap
 > `= <integer>`
 
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