Re: [Xen-devel] [TESTDAY] PV / HVM pass-through works when IOMMU present; weird failures when not

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 01.07.13 at 15:17, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> wrote:
> Jan Beulich writes ("Re: [Xen-devel] [TESTDAY] PV / HVM pass-through works 
> when 
> IOMMU present; weird failures when not"):
>> As per the above and the earlier reply I sent, I don't think we
>> should release without this fixed. Let me see whether the minimal
>> fix I sketched out earlier works...
> 
> As I just wrote on IRC (Jan, you seem to have fallen off the channel);
> 
> 14:08 <Diziet> Re Jan's comments.  To be clear, this isn't a regression 
>                compared to 4.2, right ?
> 14:10 <Diziet> I think the right answer is to treat this as an embargo-less 
>                security problem.  Preparing a proper security patch for that 
>                probably involves fixing the error handling.
> 14:10 <Diziet> And that might take a week.
> 14:10 <Diziet> I'm really not keen on this "extra check" approach.

What's wrong with it? It allows you to bail early, thus avoiding any
other setup to be done. But yes, it doesn't save you from (sooner
or later) doing proper error recovery.

Jan

> 14:11 <Diziet> So I would go ahead with the release tomorrow.




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