[Xen-devel] RE: VT-d device assignment may fail (regression from Xen c/s 19805:2f1fa2215e60)

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

>-----Original Message-----
>From: Jan Beulich [mailto:JBeulich@xxxxxxxxxx]
>Sent: Monday, October 25, 2010 4:59 PM
>To: Han, Weidong; Jiang, Yunhong
>Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
>Subject: RE: VT-d device assignment may fail (regression from Xen c/s
>19805:2f1fa2215e60)
>
>>>> On 25.10.10 at 09:05, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote:
>>>From: Jan Beulich [mailto:JBeulich@xxxxxxxxxx]
>> What's the removed bus/devfn check you mean? I didn't catch it in the patch.
>
>There used to be
>
>        if ( (secbus != bus) && (secdevfn != 0) )
>
>guarding the second call to domain_context_mapping_one().

I didn't understand quite clearly of the oriignal check (the secbus!= bus && 
secdevfn != 0). But seems the new code should be ok, we only need setup the 
devfn=0 for the pcie2pci bridge, at least according to the vt-d spec.

--jyh


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