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Re: [Xen-devel] [PATCH 3/5] vtdt: Modify vlapic code to add vtdt support

  • To: "Wei, Gang" <gang.wei@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <keir@xxxxxxx>
  • Date: Tue, 14 Dec 2010 09:56:49 +0000
  • Cc:
  • Delivery-date: Tue, 14 Dec 2010 01:59:37 -0800
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  • Thread-topic: [Xen-devel] [PATCH 3/5] vtdt: Modify vlapic code to add vtdt support
On 14/12/2010 09:30, "Wei, Gang" <gang.wei@xxxxxxxxx> wrote:

>> Writing any value to LVTT zaps TMICT,TMCCT,MSR_TDT? That seems pretty
>> unlikely to me! This obviously has effects on behaviour outside TDT
>> emulation as it affects TMICT/TMCCT emulation. Looks dangerous, as well as
>> wrong.
> 
> It should be better to do the zaps only while the mode bits of LVTT changes.

What is real hardware behaviour here? I don't see any zappings documented.

 -- Keir



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