[Xen-changelog] [xen-unstable] VT-d: should not disable VT-d when find unknown DMAR structure type

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

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1269511265 0
# Node ID 18f4db5f72d756dda30e28d5872d91d35fdf9f0c
# Parent  f42ff98a2cdca966dbfd6b16fb763920104cd38e
VT-d: should not disable VT-d when find unknown DMAR structure type

Now 4 DMAR structure types are supported (type value 0 ~ 3). Type
values > 3 are reserved for future use. Current implementation
disables VT-d when find unknown DMAR structure type, this may lead to
VT-d disabling on future platforms before supporting new types on
Xen. For forward compatibility, just skip unknown structures by
skipping the appropriate number of bytes indicated by the Length
field, and then VT-d still can be used.

Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
---
 xen/drivers/passthrough/vtd/dmar.c |    1 -
 1 files changed, 1 deletion(-)

diff -r f42ff98a2cdc -r 18f4db5f72d7 xen/drivers/passthrough/vtd/dmar.c
--- a/xen/drivers/passthrough/vtd/dmar.c        Thu Mar 25 09:32:21 2010 +0000
+++ b/xen/drivers/passthrough/vtd/dmar.c        Thu Mar 25 10:01:05 2010 +0000
@@ -713,7 +713,6 @@ static int __init acpi_parse_dmar(struct
             dprintk(XENLOG_WARNING VTDPREFIX,
                     "Unknown DMAR structure type %x\n",
                     entry_header->type);
-            ret = -EINVAL;
             break;
         }
         if ( ret )

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