Re: [PATCH] [RESEND] VT-d: Fix iommu map page for mmio pages

[Avi Kivity <avi@redhat.com>]

Muli Ben-Yehuda wrote:
> On Thu, Oct 02, 2008 at 02:56:55PM +0300, Avi Kivity wrote:
>   
>> Han, Weidong wrote:
>>     
>>> From 61028d958dc7c57ee02de32ea89b025dccb9650d Mon Sep 17 00:00:00 2001
>>> From: Weidong Han <weidong.han@intel.com>
>>> Date: Thu, 25 Sep 2008 23:32:02 +0800
>>> Subject: [PATCH] Map mmio pages into VT-d page table
>>>
>>> Assigned device could DMA to mmio pages, so also need to map mmio pages
>>> into VT-d page table.
>>>
>>>   
>>>       
>> Well, Muli says at least on one machine this allows on guest to kill
>> the host.  What are we doing with this?
>>
>> If it's a hardware bug which is planned to be fixed (or is already
>> fixed), great, but I need to know.
>>     
>
> Unfortunately I don't have access to the machine any more. We did
> spend some time perusing the PCIe spec on this point, and although it
> is pretty vague, the bottom line appears to be that peer-to-peer
> traffic (device-to-device traffic) is allowed. I'm fine with applying
> the patch.
>   

Okay, I applied the patch.

-- 
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