[PATCH] iommu: Elaborate the usage of RMRR specification on the command line.

[Venu Busireddy <venu.busireddy@oracle.com>]

As some users have suggested, elaborate the usage of RMRR specification
on the command line, and provide a usage example.

Signed-off-by: Venu Busireddy <venu.busireddy@oracle.com>
---
 docs/misc/xen-command-line.markdown |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown
index 3acbb33..77e0a20 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -1406,6 +1406,15 @@ If segment of the first device is not specified, segment zero will be used.
 If other segments are not specified, first device segment will be used.
 If a segment is specified for other than the first device and it does not match
 the one specified for the first one, an error will be reported.
+
+'start' and 'end' values are page numbers (not full physical addresses).
+If the values are not preceded by "0x", they are treated as decimal.
+
+Usage example: If there are two devices 0:0:1d.0 and 0:0:1a.0 that require
+pages 0xd5d45 and 0xd5d46 to be reserved respectively, use:
+
+rmrr=0xd5d45=0:0:1d.0;0xd5d46=0:0:1a.0
+
 Note: grub2 requires to escape or use quotations if special characters are used,
 namely ';', refer to the grub2 documentation if multiple ranges are specified.
 
-- 
1.7.1


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