Re: [Xen-devel] [v6][PATCH 2/2] xen:vtd: missing RMRR mapping while share EPT

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Chen, Tiejun
> Sent: Tuesday, September 16, 2014 6:01 PM
> 
> On 2014/9/16 9:24, Chen, Tiejun wrote:
> > On 2014/9/13 5:26, Tim Deegan wrote:
> >> At 09:59 -0700 on 12 Sep (1410512391), Lars Kurth wrote:
> >>> On 12 Sep 2014, at 01:27, Chen, Tiejun <tiejun.chen@xxxxxxxxx> wrote:
> >>>> On 2014/9/12 15:19, Jan Beulich wrote:
> >>>>>>
> >>>>>> So I still hope we can issue such a vote on these two patches if
> >>>>>> possible.
> >>> There are several ways we can do this:
> >>> * Jan and Tim can ask the other committers for an opinion (either
> >>> publicly on the list - ideally related to this thread for
> >>> traceability - or privately depending on preference) and one may
> >>> change their opinion based on what the others say
> >>> * As there is also a potential risk element for the 4.5 release
> >>> Jan/Tim could ask the Release Manager for an opinion too and take
> >>> that into account
> >>> * Jan/Tim can ask the Project Lead (aka Keir) to make a decision : in
> >>> other words as peers they both agree to disagree and ask Keir to act
> >>> as referee.
> >>
> >> Actually I don't think we need to go so far.  I'm happy to defer to Jan's
> >> judgement on this; we ought to sort out RMRRs properly.
> >
> > Jan,
> >
> > What's your last judgement?
> >
> > Could we apply these two separate patches in advance? I think actually
> > they aren't blocking the remains what we tried to do in another RFC
> > series, but now we really need them to make sure GFX passthrough can
> > work well.
> >
> > For that RFC I have to take more time to cover all scenarios, so as you
> > saw its really a slow process I can push forward.
> 
> Any consideration?
> 

Given the facts that:

- earlier two patches can fix an important usage of GPU pass-through for
Windows VM

- earlier two patches don't make things worse

- current patch set still needs quite some effort for a robust RMRR 
implementation

I'd suggest taking earlier two patches to catch 4.5 release, while the
big patch set is ongoing developed.

Thanks
Kevin

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