[Xen-changelog] [xen-4.0-testing] VT-d: fix off-by-one error in RMRR validation

[Xen patchbot-4.0-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1317656133 -3600
# Node ID cda1ee31f07bc22b598452dfafd17c729505d4ec
# Parent  bd27836e5a111f2f6adab21b8cfc62ac18338fcf
VT-d: fix off-by-one error in RMRR validation

(base_addr,end_addr) is an inclusive range, and hence there shouldn't
be a subtraction of 1 in the second invocation of page_is_ram_type().
For RMRRs covering a single page that actually resulted in the
immediately preceding page to get checked (which could have resulted
in a false warning).

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
xen-unstable changeset:   23868:28147fd781af
xen-unstable date:        Thu Sep 22 18:32:34 2011 +0100
---


diff -r bd27836e5a11 -r cda1ee31f07b xen/drivers/passthrough/vtd/dmar.c
--- a/xen/drivers/passthrough/vtd/dmar.c        Mon Oct 03 16:35:03 2011 +0100
+++ b/xen/drivers/passthrough/vtd/dmar.c        Mon Oct 03 16:35:33 2011 +0100
@@ -515,7 +515,7 @@
      * inform the user
      */
     if ( (!page_is_ram_type(paddr_to_pfn(base_addr), RAM_TYPE_RESERVED)) ||
-         (!page_is_ram_type(paddr_to_pfn(end_addr) - 1, RAM_TYPE_RESERVED)) )
+         (!page_is_ram_type(paddr_to_pfn(end_addr), RAM_TYPE_RESERVED)) )
     {
         dprintk(XENLOG_WARNING VTDPREFIX,
                 "  RMRR address range not in reserved memory "

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