[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] 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> diff -r 298794763a75 xen/drivers/passthrough/vtd/dmar.c --- a/xen/drivers/passthrough/vtd/dmar.c Fri Mar 26 02:04:06 2010 +0800 +++ b/xen/drivers/passthrough/vtd/dmar.c Fri Mar 26 02:08:45 2010 +0800 @@ -730,7 +730,6 @@ 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 ) Attachment:
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