[Xen-devel][Patch]No writeback for bt operation

["Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>]

Hi, Keir, 
    I find that Win2k3 guest will sometimes write back data to Read-only
registers, and it is caused by "bt" instruction. The attached tiny patch
is to disable writeback for bt instruction.

Signed-off-by: Xu Dongxiao <dongxiao.xu@xxxxxxxxx>

Best Regards,
--Dongxiao

Attachment: bt_no_writeback.patch
Description: bt_no_writeback.patch

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