Re: [Xen-devel] [PATCH] IOMMU: don't disable bus mastering on faults for devices used by Xen or Dom0

["Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>]

Hi, Jan 
If the phantom device support for IOMMU is in upstream,  is this patch still 
needed ?  Basically,  I can't figure out why several faults should be allowed 
before disabling bus mastering.   Did you meet some real issues ?   Thanks!
Xiantao
> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Friday, November 30, 2012 5:51 PM
> To: wei.huang2@xxxxxxx; weiwang.dd@xxxxxxxxx; Zhang, Xiantao; Keir
> Fraser
> Cc: Dario Faggioli; xen-devel; Tim Deegan
> Subject: Re: [Xen-devel] [PATCH] IOMMU: don't disable bus mastering on
> faults for devices used by Xen or Dom0
> 
> >>> On 30.11.12 at 10:42, Keir Fraser <keir@xxxxxxx> wrote:
> > On 05/11/2012 16:53, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
> >
> >> Under the assumption that in these cases recurring faults aren't a
> >> security issue and it can be expected that the drivers there are
> >> going to try to take care of the problem.
> >>
> >> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> >
> > This one's sat a while with no comments...
> 
> It's in already (26133:fdb69dd527cd), with Tim's and Dario's ack (who were
> the ones involved in creating the original change this modifies).
> 
> But yes, we're having a general response problem for IOMMU related stuff -
> I already asked for this to be a topic on the next community call.
> 
> Jan


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